1 The Radio Society of Great Britain Members Magazine 3.95 Vol 80 No. 12 December 2004 A winter ‘s narrative – attend RadCom News, pages Merry Christmas from the RSGB 
2 WATERS & STANTON WISH ALL OUR CUSTOMERS A MERRY CHRISTMAS & HAPPY NEW year ! New The Waters & Stanton 2005 UK Radio Communication Equipment Guide now Available now 384 broad colo turn down pages bursting with over 5000 products, information and money off vouchers, silent lone P & P Price Match Competitor second goods must be : new, UK sourced via official UK distributors and be in livestock. Some competitors items offered may be non-uk compatible, x demonstration or have no CE or E approval. All our new products come through official sources. baby buggy charges : A= 2.75, B= 6, C= 10 NEW IC-7800 In Stock ! No deposition and 12 months interest release ! subject to status – see details below ICOM IC-756 PRO II ICOM IC-7400 SPECIAL OFFER ICOM IC-703 SPECIAL OFFER ICOM IC-706 IIG DSP Heil Traveler individual ear 706 headset + PTT B ICOM IC-718 LAST FEW ! 1899 C Flagship of the Icom stove of HF transceivers. HF & 50MHz, features big colour LCD with spectrum scope, car ATU and 32- bit floating point DSP whole C HF/VHF 100W transceiver covers MHz Features large LCD with spectrum setting, car ATU and same DSP system as IC-756PRO II. A great base post ! Comes with absolve SP-21 Speaker & SM-20 Desk mic 539 C HF/ 50MHz Transceiver W Portable, Mobile, Base-Station. Ideal for Foundation Licence/QRP. Auto ATU, DSP memory cardinal. External batt BP B FREE Icom IC-703 Logbook with every IC While Stocks last ! 769 C HF/VHF/UHF mobile DSP transceiver. Its relative little size not alone makes it a great mobile carriage but besides for fixed station use as well. HF general coverage and VHF & UHF. 449 C YAESU FT-1000 MKV YAESU FT-1000 FIELD KENWOOD TS-480SAT & TS-480HX YAESU FT-897D YAESU FT C 200W HF transceiver, EDSP, Collins filter, car ATU, 220V AC PSU – Acknowledged as one of the finest DX rig on the market. Superb tailored audio and the ability to select Class A bias for dramatic signal purity C 100W HF transceiver, EDSP, Collins filter, car ATU, 220V AC / 13.8V DC – build on the success of the FT-1000MkV, the Field has become a respect leader in its class. The TS-480SAT is the 100W version of this NEW new HF+6m transceiver from Kenwood. Smaller than the TS-2000/ TS-B2000 it has many like features. TS-480SAT 999 C The TS-480HX is the 200W translation of this modern HF+6m transceiver. TS-480HX 1099 C 899 C 100W HF rig plus 2m and 70cms ( 50W/20W ) 13.8V external provision / inner optional FP-30V AC baron supply / self powered portable using optional Ni-MH pack at 20W output signal. compatible with FC-30 car ATU and ATAS 120/100 antenna. The must have radio for C BUY NOW PAY LATER AT ALL THREE STORES You won thymine find a better deal ! validation that at W & S you get the best possible deal. On selected items it is now potential to pay nothing for a wholly class without incurring any interest charge. amaze but genuine. And what s more, you get credibly the best prices in the business. Give us a call nowadays or visit one of our branches. Important. When visiting a store, please bring two pieces of identity eg. driving license, holocene utility program bill, passport, holocene bank statement ( all to show your savoir-faire ), or credit card. 0 % APR TYPICAL EXAMPLE OF BUY NOW PAY LATER. CASH PRICE 600. PAY NO DEPOSIT AND PAY THE FULL AMOUNT 12 MONTH S LATER. PAY NO INTEREST. OR AFTER TWELVE MONTHS 29.8 % APR REPAY PER MONTH FOR 36 MONTHS. TOTAL AMOUNT DUE INTEREST IS CALCULATED FROM THE DATE OF THE AGREEMENT. ALL FINANCE SUBJECT TO STATUS WRITTEN QUOTATION ON REQUEST. KENWOOD TS-2000 KENWOOD TS-870S DSP MC-60A infrastructure mic with pre-amp. Ideal couple B KENWOOD TS-570DGE ICOM IC-910HX with 23cm UT-106 DSP unit of measurement B HF 100W transceiver. Covers all HF bands plus wideband receive. C/w dual VFO, SWR meter etc. Options include extnl ATU DSP & filters C Top-of-the-range Kenwood transceiver. HF/VHF/UHF or up to 23cm with the optional faculty. built-in car ATU, DSP and its alone TNC. ARCP Control Software B 1399 C HFDSP 100W base place MHz. Excellent all beat rig big for DX working with its ability to winkle out weak stations using its true IF DSP. No filters to buy. 849 C HF100W base station with built-in car ATU. Very democratic rig, excellent performance on SSB and CW. Two fitted antenna sockets – very handy. SP-23 Matching base place receiver B 1249 C Icom s all mode VHF/UHF transceiver with 23cm. big clear LCD with lots of facilities. 100W on VHF and 75W on UHF, 10W on 23cm. basic Model IC-910H 1099 C YAESU FT-857D TOKYO HY-POWER HL-50B 1.8 to 440MHz, this all-in-one transceiver offers unbeatable value. 100W on HF plus 6m, and 50W on 2m and 70cm. You get actual RFclipping on SSB for up to 6dB acquire and there are 4 separate antenna sockets. 649 C HF / 50 / 144 / 430MHz Mobile Transceiver. HF/6m 100W, 2m 50W, 70cm 20W. ( 13.8V DC ) Developed on the FT-897 and FT- 817 transceivers. Built-in features 32 semblance display, spectrum scope, AM airband aircraft reception, built-in memory cardinal, detachable front empanel. YAESU FT-817ND 499 C Designed for FT-817 SG m 20W QRPers Delight 100mW to 20W SSB and CW. Rugged, pack and very low DC drain ( 4A soap ) .selectivity 100Hz – 2.7kHz. amaze value. 160m – 70cms. Up to 5W output all modes. Ours includes battery and charger. Add 90 for DSP adaptation C end few ! This Linear Amplifier has been specifically designed for use with the FT-817. Enjoy up to 50 Watts end product C
3 NO DEPOSIT nothing TO PAY FOR 12 MONTHS ON SELECTED ITEMS MARKED BY ICOM IC-E208 NEW 279 C YAESU VX-7R 299 B VHF/UHF FM Dual Band Mobile Transceiver *Freq range MHz, MHz Tx *55/50W ( 3 pressurized water reactor steps each band ) *Wideband Rx, & MHz *512 memories *FM pin down capability *104×2 DTCS, 50 CTCSS tonicity put-down *16 DTMF channels *HM-133 outback control mic *Packet ready for 9600/1200bpsmini DIN or 1200bps-mic socket *Supply 13.8V ICOM IC-2725E 269 C 6m/2m/70cm Available in Silver or Black NEW ICOM IC-756 PRO III ICOM IC-2100H YAESU FT-8900R NEW Want the best of all worlds then the FT-8900R is equitable the tag ! A rig with four of the most popular fluid bands – 10m/6m/2m & 70cm. detachable head. YAESU FT-2800M NEW YAESU FT-8800E Dual Band FM Mobile 50/35W The FT-8800R series operates as two radios in one, with independant two duct operation. Remote head mounting capability, wideband receive on VHF & UHF and over 1000 memories. YAESU FT-7800E NEW We Price Match ! Call KENWOOD TMD-700E KENWOOD TM-V7E KENWOOD TM-G707E The Icom IC-2725 double isthmus FM transceiver is proving identical popular. Easy to install, the restrainer is separated from the main unit – great where space is limited. 339 C 229 C 2m 55W FM fluid. commercial grade, rugged structure. One piece die-cast aluminum human body. Selectable green or amber display. 159 C * MHz *FM * MHz expanded Rx *RF Pwr 65/25/10/5W *25/12.5kHz distribution channel spacing.the NewFT-2800M from Yaesu with 65 Watts High Power, rugged construction, excellent receiver performance and send computer keyboard entry. 289 C 239 C *2m/70cms Dual Band Mobile *High ability 50W 2m /40W 70cms *Wide receive inc. civil & military airband *CTCSS & DCS with direct computer keyboard mic. *Detachable battlefront control panel *1000 memories plus five one-touch 449 C surely the best 2m/70cm double band mobile transceiver with APRS. Does not need supernumerary eminent cost boards to function. The entirely extra if required is a compatible GPS receiver. 359 C Dual-band 2m/70cm. A cover girl cool bluing display, easy to read with 50/35W output. 50W/35W plus 280 memos and five storable operate profiles. 289 C Dual Band If you are looking for simplicity and low price, here s the answer. 2m & 70cms with detachable battlefront control panel and Easy operation manner. great ! The VX-7R is the best outdoor handie ever. The case, computer keyboard, speaker and connectors are all sealed against water damage. wide Frequency coverage from 500kHz to 900MHz the VX-7R is ideal for monitoring a variety of broadcasts. The display is a dazzling 132×64 department of transportation matrix providing easy-to-read frequencies and information plus graphic graphics. YAESU VX-150 YAESU VX-2E NEW ICOM IC-T3H ICOM IC-E B Dual Band handy, 1.5W ( 2m ) and 1W ( 70cm ). Full DTMF, CTSS and DCS. With 1300 memories and AM/FM coverage 500kHz-960MHz. 129 B 125 B The VX-150 is a in full featured covenant yet fabulously rugged 2m 5W Handheld. Features include lead computer keyboard frequency entry, CTCSS, DTMF, 1750Hz tone calling, wide/narrow deviation choice. It has a die-cast sheath, large high output speaker, illuminated computer keyboard and barrage electric potential meter. 269 B The newfangled E-90 offers treble band coverage of 6m, 2m and 70cms. Up to 5W output and rx coverage from 495kHz – 999MHz makes this a identical attractive rig. The IC-T3H 2m hand-held features ruffianly quality but with slender looks. Its striking green polycarbonate case has been ergonomically designed. The rig is able of providing a potent 5.5W end product with either Ni-Cad or Ni-MH battery packs. Supplied with charger and rechargeable battery. KENWOOD TH-D7E 319 B DATA COMMUNICATOR One of the most successful handhelds over the past few years. It has a built-in TNC for Packet use. You can besides use it for APRS operation in junction with an external GPS unit. Plus NMEA, 200 memo, and up to 5W output. KENWOOD TH-F7E 249 B WITH EXTRA WIDE RX COVERAGE MHz Tx/Rx : FM MHz Tx/Rx : FM Up to 6W out with Li-ion battery and scanner style coverage from 100kHz to 1300MHz including SSB on receive ! This is a bang-up radio to have at all times when you are on your travels. YAESU VX-110 KENWOOD TH-G71E 199 B If you want an excellent 2m/70cm dual-bander then you can t go incorrectly with the TH-G71. Fully functional with three power levels, 200 memories, CTCSS tone encoder/decoder, illuminated computer keyboard and backlit LED. 119 B Combining the huskiness of the VX- 150 with the simplicity of 8-key process, the VX-110 is a fully featured 2m hand held ideal for the most demanding of applications. With its die-cast shell, large speaker, and illuminated computer keyboard, it is peculiarly well suited for most conditions. The VX-110 is a identical low-cost, rugged and authentic hand-held. The IC-756PRO III marked its debut at the Leicester Amateur Radio Show at Donington. This is Icom ‘s latest HF transceiver and incorporates many of the features from its predecessors and from the new engineering used in the IC C NEW YAESU FT-60R 5 Watts Dual Band For Just *Wide band Reception MHz & MHz ( Cellular blocked ) *New Emergency Automatic ID System *Huge LCD *High 5W Power Output *Ni-MH long-life Battery FNB-83 ( 7.2V, 1400mAh ) *Overnight Charger *Programmable Keys for user convenience *Split CTCSS/DCS and DCS Encode-Only Capability B The FT-60E is a modern dual-band FM handheld transceiver from Yaesu. It provides versatile 2-way comms with matchless monitor. This is a furrowed purpose that is glad in all weathers. And its wide liquidator scope makes it an ideal companion for the traveler. 
4 VERTICAL MOBILE ANTENNAS Out performs all other unmarried banders by up to 3dB ! Purchase the MO-3 base ( 137cm ) for or the MO-4 establish ( 68cm ) for then add the coil + resonator of your option : RM-10, RM-12, RM- 15, all ea. RM-17, RM ea. RM, Resonator RM ( all 200W ) If you want 1kW power handle and evening better bandwidth choose : RM-10S 24.95, RM-15S 26.95, RM-20S RM-40S or RM-80S CUSHCRAFT BASE ANTENNAS MA6V NEW m 250W PEP C MA5V m 250W PEP C R m 1.5kW C R m 1.5kW PEP C DIAMOND CP6 Base section ( MO-3 or MO-4 ) Carriage 6 on any combination. CUSHCRAFT HF BASE ANTENNAS *Bands : MHz *Power : 200W *VSWR : Better than 1.5:1 *Socket : SO-239 *Height : 4.6m *Radials : 1.8m adjustable Covers five democratic HF bands and the 6m band. low lean radiation makes it ideal for DX work. Outperforms dipoles for long distance contacts and compares favorably with beams located 10m+ above ground. It doesn t need long wire radials. adjustable rigid radials, DC return helps the antenna get rid of static randomness. Antenna is adjustable for each band. HARI High quality German trap. ( Pairs ) 200W 20m molarity molarity kW 20m m megabyte Carriage 2.75 HARI High quality German Baluns SO W 1:1, 4:1 or 6 : ea. 1kw 1 : :1 or 6 : ea Carriage 2.75 HORIZONTAL BEAMS & DIPOLES CUSHCRAFT Prices down ! Premier HF beam used around the global by serious DX ers. X-7 20/15/10m 7 elevated railway. Yagi 2kW D not got the space for a entire sized HF glow antenna, then the mini beam MA-5B should be considered C MA5B m 4 elevation. Yagi 2kW C A4-S & 20m 4 elevated railway. Yagi 2kW D A3-WS 12 & 17m 3 elevated railway. Yagi 2kW D D m dipole element 2kW C Don t want a electrify antenna but can t fit a Yagi, then consider a rotatable dipole. D-3W thousand dipole component 2kW C D m dipole element 2kW C D-40 40m dipole chemical element 2kW C TEN-3 10m 3 elevated railway. Yagi 2kW C ASL MHz 8 elevation. log periodic C RADIO WORKS – CAROLINA WINDOMS A choice of quality telegram antenna available to fit about any circumstances. Prices down ! CW m 76.8m long C CWS m 40.5m hanker C CW m 40.5m long C CWS m 20.1m long C CW m 20.1m long C CW m 10.36m farseeing C CW m 9.7m ( 32ft ) long C G5RV PLUS 80-10m with balun 31m ( 102ft ) long B MFJ-993 *Auto ATU with digital data dis [ play*1.8-30mhz *Long wire, wheedle & balance lineage *300W SSB, 150W CW *Cross needle metering *Size 255 ten 70 adam 235mm *Weight 1.8kg Auto ATUs MFJ-991 Similar to the MFJ-993 but handles 150W SSB/100W CW and matches Ohms. Does not have digital VSWR meter LCD readout aural VSWR, antenna switch or 4:1 balun. MFJ-941E A bang-up budget ATU. All the bang-up MFJ features that make it ideal for base station practice. *1.8-30MHz *300W *Cross acerate leaf meter *VSWR & PWR 30/300W *Terminals for wires and bal. lines *Internal 4:1 balun *Ext. Dummy load socket *SO-239 sockets *Size 260 x 180 ten 70mm MFJ-974H A true balance agate line ATU that is ready made for open wire bird feeder. highly accurate balancing provides optimum performance. It can besides be used for farseeing wires and coaxial cable. Great for all-band doublets. *1.8-54MHz ( MFJ-974H ) *300W *Balanced, wire or coax *SO-239 sockets *Size 195 x 155 ten 220mm *Weight 2.05kg Zero Space – – DX Antennas From Hustler USA Run full moon legal baron – 80m to 10m – with no masts or guys to worry about. 50 Ohm feed. Small garden, planning problems or exchangeable restrictions ? then the Hustler roll is the answer. These HF verticals will take 1kW of ability, work at background level, and are self-supporting. A individual earth rod will get you going. Add buried radials for even better results. many hams have got on the HF bands with precisely this simple system. so why not join in the fun. These are rugged, well-built antenna that american hams have been using for years. now they are available in the united kingdom from our three stores. 4BTV m. 6.52m senior high school. Full band coverage C 5BTV m. 7.64m high. Full band coverage ( 100kHz on 80m ) C 6BTV m. 7.3m high. Full band coverage ( 100KHz on 80m ) C In Tune with MFJ … World s Finest Base Base Auto Antenna Tuners The car ATU that has a digital datum expose and can even handle wires ! C World s Finest Base Base Auto Antenna Tuners Auto ATU B Manual ATU B C MFJ-904H Just the job for portable use. It s sol small ! *3.5-30MHz ( 80-10m ) *150W wire, coaxial cable, balanced *Internal 4:1 balun *SO-239 sockets *Size 180w x 60h adam 80d ( millimeter ) *Weight 650g MFJ-962D Ideal for use with linears. Gandles balanced, coaxial cable and telegram. *1.8-30MHz *1.5kW Roller Coaster *VSWR meter *6-way antenna/load switch *Buit-in 4:1 balun *2 wheedle positions *Size : 270x375x115mm MFJ-989C 3kW MHz. Wire, balanced and coaxial cable prey. Full meter and switch. MFJ-986 3kW fast derived function tuning design MHz. Wire balanced and wheedle systems. Full meter and trade. MFJ-949E MHz. 300W wire, balanced and coaxial cable. Inc dummy warhead, metering and antenna picker. MFJ-948E like to the MFJ-949E, but without internal dummy lode. One of the most popular ATUs in the worldly concern ! SMP-1000A *Input : V AC 50/60Hz *Output : 3, 4.5, 5, 6, 9. & 12V DC *Regulated *Max current 1000mA *6 connectors *Reversible connectors *Cable length 1.8m PORTABLE ANTENNAS Check our web site for more information – mobile and portable practice Manual ATU B Manual ATU C C C B B 9.95 A Very handy switch mode regulated AC/DC Adaptor with short tour and overload security with soap current to 1000mA. great for the trail, 3-12V DC selectable, many uses. Six diffrent baron connectors with the ability to change the mutual opposition. MIZUHO ( FOR FT-817 ) ATX-WBN Walkabout 80-6m Whip 1.5mBNC B ATX-WPL Walkabout 80-6m Whip1.5mSO B ATX-W38 Walkabout 80-6m Whip 1.5m 3/8in B New ATX-MkII B The new ATX-MkII Walkabout includes 3 unlike connections, PL-259, BNC & 3/8th. AT-80 Single band 80m whisk with BNC A AT-40 Single band 40m whip with BNC A AT-30 Single band 30m whip with BNC A AT-20 Single band 20m whip with BNC A Range of single dance band HF antenna with BNC association. ideal for FT-817. AT-17 Single ring 17m whip with BNC A AT-15 Single band 15m flog with BNC A AT-12 Single set 12m whip with BNC A AT-10 Single band 10m whip with BNC A 5 RSGB MATTERS RADIO SOCIETY OF GREAT BRITAIN RSGB matters THE NATIONAL SOCIETY WHICH REPRESENTS UK RADIO AMATEURS Founded in 1913 corporate Limited by guarantee Member society of the International Amateur Radio Union Patron : HRH Prince Philip, Duke of Edinburgh, KG, KT Membership is open to all those with an active interest in radio experiment and communication as a hobby. Applications for membership should be made to the Subscriptions Department from which full details of Society services may besides be obtained. GENERAL MANAGER AND COMPANY SECRETARY : Peter Kirby, FCMI, MISM, G0TWW HONORARY TREASURER : put vacant BOARD OF THE SOCIETY PRESIDENT J D Smith, MI0AEX MEMBERS G L Adams, G3LEQ E F Taylor, G3SQX R J Constantine, G3UGF E A Cabban, GW0ETU D G C Hicks, G6IFA K A Wilson, M1CNY C J Thomas, G3PSM A G Annan, C Eng, MIEE, MM1CCR REGIONAL MANAGERS K A Wilson, M1CNY G M Darby, G7GJU E A Cabban, GW0ETU M J Salmon, G3XVV G Hunter, GM3ULP R Clarke, G8AYD K Frankcom, G3OCA. B Scarisbrick, G4ACK P Thomson, GM1XEA R Ricketts, GW7AGG P Berkeley, M0CJX I Rosevear, G3GKC P Lowrie, MI5JYK Details of the Society sulfur volunteer officers can be found in the RSGB Yearbook 2004 HEADQUARTERS AND REGISTERED OFFICE Lambda House, Cranborne Road, Potters Bar, Herts EN6 3JE Tel : fax : All calls to the RSGB are charged at National Rate QSL Bureau address : PO Box 1773, Potters Bar, Herts EN6 3EP addresses : ( books, filters, membership & general enquiries ) ( GB2RS and club news items ) ( news items, feature submissions, etc ) ( Examinations, beacons, repeaters, GB calls, licensing ) ( Islands On The Air ) ( managerial ) Website : WebPlus : Members-only world wide web site Use your callsign in lower case as the drug user diagnose, and your membership phone number ( see RadCom address label ) as the password. DOUBLE SPECTRUM AT 40m FOR UK AMATEURS The RSGB and Ofcom are pleased to announce that all UK radio amateurs were granted entree to frequencies between 7.1 and 7.2MHz from 0100UTC on 31 October. Access is granted on a secondary coil ( non-interference ) basis using a maximum of 26dBW ( 400 watts ) pep for Full licensees ( 50W for Intermediate and 10W for Foundation licensees ). Notices of Variation for the three license classes were published on the Ofcom web site ( m_radio/ap_forms/ ? a=87101 ) on 27 October. It is recommended that for the time being lone voice and Morse code modes are used between 7.1 and 7.2MHz. Band planning issues on 7MHz will be kept under regular review and will be dependent on the number of administrations granting early on access to this band anterior to wax Primary access on 29 March The RSGB would like to offer its taste to all parties involved in the consultations, in detail the circulate industry, the UK Ministry of Defence, the Radiocommunications Agency and its successor Ofcom. Amateurs in the Republic of Ireland were besides granted access to MHz towards the end of October, joining those in Croatia, Norway and San Marino who already had access to these frequencies. Radio amateurs in Switzerland will besides gain access to MHz from 1 January RSGB PROPOSES ALLOCATION AT 500kHz The RSGB has made a proposal for radio amateurs in the UK to have access to frequencies between 501 and 504, or 508 and 515kHz, at a convey level of 10W EIRP. The allocation, if accepted, would extend amateurs experimental work to that taking stead on 73, 136 and 1810kHz and frankincense care understand of depleted and medium frequency propagation mechanism. The two frequency band options are proposed as they are no longer used for maritime telegraph in the Western hemisphere and their custom for non-directional aeronautical beacons ( NDB ) is being phased out. It is sympathize that it is unlikely, in the dear future, that these channels will be re-allocated to another serve. Further details of the RSGB proposal can be found on the Spectrum Forum web site at mf.htm RSGB AFFINITY CREDIT CARD Holders of the RSGB credit menu will have, or will curtly, receive a letter from Bank of Scotland advising you that this program will be transferred to MBNA in June This transmit should not inconvenience or penalise you in any way. For you, the cardholder, there will be no change in the room that your report is operated and we have been advised that the APR is in fact lower than the current charge. MBNA will of course propose you further in ascribable course. For the Society there will be an increase of 1.50 to 4.00 for each card activated in addition to the current income received for custom. This is dependent upon cards being used within the last six months. This source of income requires little input from the Society and we are grateful to our members for their support of the scheme. NEW 5MHz BEACONS The RSGB is close to installing and operating two new beacons on 5290kHz. The newly beacons, which some have monitored during their hardware trial phase, will be installed soon and operate under the callsigns GB3WES and GB3ORK. GB3WES will be located in Cumbria and GB3ORK in the Orkney Islands. Both will have a step convey ability sequence and a 30-second heavy sequence of 0.5ms pulses at 40Hz prf identical to that of the current GB3RAL beacon. Their air times will follow GB3RAL by one and two minutes respectively. With GB3RAL located in Oxfordshire, the three beacons will provide an excellent spread of signal reference across Great Britain and frankincense offer experimenters a singular opportunity to study propagation effects at 5MHz from their own QTH. In addition to people designing and conducting their own experiments all are additionally invited and encouraged to send in their reports to the 5MHz Working Group in back of the 5MHz Experiment. note that the use of these three beacons is open to all, as no NoV or amateur license is required to monitor and collect data. far information is available on the RSGB Spectrum Forum web site at htm The RSGB 5MHz Working Group would like to thank Andy, G4JNT, who has designed and built the beacons and besides the two new radio beacon keepers, John, G3WGV, and Donnie, GM0HTH. TRAIN THE TRAINERS GOES TO DEVON At the end of a week of the worst storms to hit the Torbay sphere for many years, Saturday 30 October saw the first Train the Trainers course in the West Country take place. The seance was organised by Deputy RSGB Regional Manager for Devon, Pam Helliwell, G7SME, after requests from club instructors who were concerned about how to incorporate supernumerary material demanded by the new three-tier license social organization into their courses. A minimal of eight interest instructors were needed to make the course a viable proposition. Pam contacted RadCom December 
6 RSGB MATTERS CONGRATULATIONS ! Congratulations go to the follow RSGB members who successfully upgraded from Foundation to Intermediate license by taking the Intermediate examination on 11 October : Alan Jessop, M3JRA ; Susan Ramsden, M3XJT ; Mark Vaughan, M3VAU ; Clive Crosby, M3XBY ; Alan Fraser, M3FVM ; Alistair Morrell, M3DLK ; David Rennie, M3HGG ; Chris Jewell, M3HGI ; Dave Sharpen, M3GHK ; John Roberts, M3FQC ; Graeme Hendry, M3GZS ; Ian Sanderson, M3ILS ; Keith Taylor, M3KRP ; John Dixon, M3LKD ; David Holloway, MW3MMD ; Carl Elton, M3XCE ; Michael Foy, M3FOY ; Eric Foster, M3HCA ; Frank Taylor, M3EBJ ; Phillip Mather, M3PMM. Brian Reay, G8OSN, leading the Devon Train the Trainers seance. respective Devon clubs and soon there were more than adequate interest in taking share. Brian Reay, G8OSN, was in charge of the course, with Alan Betts, G0HIQ assisting. The instructors being trained were Derrick, G3LHJ ; Colin, G4FCN, and Larry, M1ARW, from the Torbay Amateur Radio Society ; Bob, G7NHB, and Chris, M5CJW, from Plymouth ARC ; Peter, M0BHJ, and David, G0VTX, from Nortel RC ; Don, G7PFU ; David, M3EOQ, and Brian, M3OZJ, from Holsworthy ARC, all representing Devon, and, from far afield, Peter, M0PTR, from Flight Refuelling ARC in Dorset ; Phil, G0KKL, DRRM for District 114 ; Peter, G0FIM, and Les, G7THT. The lectures were very interesting and enlightening. Each new course of study token was discussed, along with tips on how to put across the requirements to the candidates. The Child Protection Act was interpreted in the context of the train environment. The importance of having a parent or defender salute during the course was emphasised – besides the advantage of persuading the parent or defender to sit the examination at the end of the course and therefore having an extra radio amateur in the family ! Some of the instructors were new to teaching and some had a great number of years experience as radio amateurs. All found the lectures of concern and benefited from being able to bounce ideas off each other. It was useful to share personal experiences from running oldstyle RAE courses and see how to incorporate these in the new three-tier organization of licences. Brian Reay and Alan Betts are to be congratulated on running this course. A lot of meter, feat and energy has gone into preparing for the day and putting across the information in a very blithe ( sometimes ) and authoritative manner. RADIO COMMUNICATIONS EXAMINATIONS Following discussions between the Society and Ofcom, changes will be made in the Advanced examination. This is the examination that qualifies amateurs for the Full Licence, the top level of the three-stage UK license march. The changes have been made following the current pilot scheme, which has been in effect since the examination mho introduction at the begin of this year. To bring it into trace with current educational practice, a Formula Sheet will be included in the examination substantial. This will allow candidates to concentrate on the concepts required, rather than memorising equations. In addition, the number of questions will be reduced to 62 from the current 68, to shift the vehemence more towards operating practices rather than electronic theory. The changes will come into impression from the begin of RSGB Board extremity Ed Taylor, G3SQX, said, We proposed some amendments in the operation of the Advanced examination, following comments that the new examination was more technical foul than the erstwhile RAE. Ofcom agreed, and we are please that a way was found to implement changes without reducing the asperity of the organization. We hope to publish an article about the modern Advanced Radio Communications Examination in RadCom future month. INTERNET-LINKING NoVs – clearing It appears there is some confusion regarding precisely which class or classes of Internetlinking related NoVs will lapse on 31 December 2004 unless renewed anterior to that date ( see RSGB Matters, RadCom November 2004 p5 ). only those NoVs which have been issued to allow process of an internet gateway on a simplex frequency, via the RSGB Data Communications Committee, are affected at present. Neither those NoVs which have been issued by RA or recently Ofcom which permit Internet-linking of a recidivist which has a callsign in the GB3xx series, nor those issued by the RSGB DCC for package radio mailboxes or digital nodes are affected at this fourth dimension, and these will remain in military unit until far notice. For specific queries, please your request to CORRECTION 144MHz Direct Conversion Receiver, pp102/03 November RadCom. The table to the extreme right of the switched amplifier incision should read as follows. decibel Resistors Total k + 3.3k 46.3k 20 11k kelvin k 330k 3.267k 40 1k k The symbol means in latitude with. besides, the capacitor measure shown in brackets towards the left in the bandpass filter should read 0.35pF, not 36pF. VHF AWARDS NEWS All recent claims have been for the 50MHz band. Donald McKay, MM5AJW ( KW ), now has a 100 countries poser for his 50MHz Countries ( 2-way ) certificate. Geoff Crowley, MM5AHO ( AB ), has been awarded a 50 countries poser for his 50MHz Countries ( 2- means ) certificate, together with a 250 squares poser for his 50MHz Squares certificate. Douglas Rolph, G0UYC ( NR ), has gained a far spine for his 50MHz Squares certificate and this time it is for working 575 squares. I have besides received a bombastic claim from Andy Kissack, GD0TEP ( IOM ). Andy now has a 140 Countries dagger for his 50MHz countries ( 2-way ) certificate. In 2002 Andy set a record by becoming the first person to have 600 squares confirmed on 50MHz. Andy has now raised the banish again by becoming the first person to have 700 squares confirmed on 50MHz. Details of awards can be found in the latest RSGB annual, or by following the connect from the RSGB web site or by to Claims should be sent to Bill Salt, M0CBQ, 89 Woodhall Drive, Waltham, Grimsby, North East Lincolnshire DN370UX and all claims must be accompanied by an SASE. QSL BUREAU NEWS Graham Ridgeway, M5AAV, the RSGB QSL Bureau Sub- Manager for the M5 serial of callsigns ( v/index.htm ) has moved theater. His new address is : 6 Pilgrim Street, Nelson, Lancashire BB9 0JQ. 6 December 2004 RadCom 
7 By John Gould, G3WKL, Chairman, HF Convention Organising Committee NEWS FEATURE Pathways, 116 Wolverton Road, Newport Pagnell, Bucks MK16 8JG. The best HF Convention in years … This year s HF Convention took place over the weekend of October at a new venue, the Gatwick Worth Hotel. From the feedback and the diaphanous buzz going around the position over the weekend, everyone seemed to enjoy themselves, as John Gould explains … T his year mho HF Convention was a great success, one of the reasons credibly being that we had the arrant range of the hotel, and were frankincense able to spread ourselves out, making habit of their many conference rooms, hotel bar and television lounge, thus radically transforming the place to suit our needs. This year was besides the IOTA program s 40th anniversary, which helped to attract island chasers from near and far, many of whom arrived on the Friday evening for the welcome snack bar. The Convention program surely helped to attract a boastfully gather, not entirely of those who booked packages but besides of day visitors. With a string of DXpeditions such as 7Q7MM, T33C, TJ3G, GB2LI and of course 3B9C to draw upon, the convention had to be a success from the DX position ! however, in keeping with late years we besides had a very strong program for those interest in a more technical slant. We were privileged to host the first major technical presentation outside Japan on Yaesu s new transceiver, the FT DX 9000, and we were besides treated by two near-flawless Internet videocon- ferences. Another samara session of relevance to most radio amateur was the one on PLT and the future of the HF spectrum. It was a capture panel discussion, chaired by the wellknown journalist Barry Fox, and a session that deserved longer than we had programmed. This year besides saw extra efforts to make newcomers to the hobby feel more contribution of the consequence. We did this in two ways, first by putting on a number of sessions within the course of study aimed at their interests. second, we hosted all three license exams over the weekend. In addition to the lecture plan, there was a count of early attractions at the event. For the first time for many years, we saw both HF and VHF trophies being presented at the same event. We had an excellent pair of HF stations, both sponsored by Yaesu ( UK ), which made contacts with over 180 DXCC entities, and an LF station on 136kHz that managed 20 QSOs in eight countries. In putting on the event, we once again we need to thank our independent sponsors Yaesu ( UK ) and Martin Lynch & Sons whose support is crucial to the finance of the consequence. We besides need to thank Yaesu ( UK ) for the first pry for the DXpedition Fund raffle of an FT-897 all-mode MHz multi-mode transceiver, which was won by Mike Allisette, GU4EON. ML & S kindly sponsored the second loot, a Yaesu FT / 50 / 144 / 430MHz FM transceiver, which was won by Don Field, G3XTT. The raffle raised around 1200, all of which will be used to support future HF DXpeditions. In addition I would besides like to acknowledge bhi Ltd, Kenwood ( UK ), KMK Ltd, Moonraker, Nevada, SHACKLOG, W3UR ( The Daily & Weekly DX ), RCQ Electronics, Walford Electronics, W H Westlake, IZ7AUH, the RSGB Bookshop, IOTA and some anonymous amateurs for donating prizes for the raffle. As is usual with any event, there are many people to thank who worked behind the scenes, frequently over many months, to make it all happen. I have personally thank members of my organising committee, the RSGB HQ staff and the members of the Crawley ARC. ultimately, we need to thank our presenters, for their time, attempt and skill at making their talks so interest. crown, from left to right : At the DX Dinner, star MC Bob Beebe, GU4YOX, with oversea guests Wayne Mills, N7NG ; Jens Sperling, DL7AKC, and ( with hat ) Yaesu s Chip Margelli, K7JA. Who says amateur radio is an erstwhile man s hobby ? This year there was a very welcome large contingent of young amateurs at the Convention. This year the HFC celebrated IOTA s fortieth anniversary. here, IOTA Manager Roger Balister, G3KMA, mans the IOTA rack. Bottom, from left to right : Jim Moritz, M0BMU ; Mike Dennison, G3XDV, and ( sitting ) David Bowman, G0MRF, at the 136kHz presentation post. There was a real buzz around the place. Winner of the raffle star prize, a Yaesu FT- 897 HF / VHF / UHF transceiver, was Mike Allisette, GU4EON ( right ), seen here being presented with his choice by Paul Bigwood, G3WYW, of major sponsor Yaesu ( UK ). RadCom December 
8 Yaesu Specials FREE double isthmus handie ! Yaesu FT-1000MP mkv inactive the flagship of theyaesu HF Range. 200W and put the CDXC IOTA crew on the map. RRP : 2599, MLS : 2395 including FREE VX-2E Twin bander SAVE OVER 400 ! SAVE OVER 340 ! SAVE OVER 300 ! SAVE OVER 100 ! SAVE OVER 90 ! SAVE OVER 300 ! FT FC-20 Mega Bundle ! The celebrated HF Transceiver is immediately even better value. Buy a new FT-847 and add a new matching FC-20 Auto Tuner for only ( worth ! ) only or 36 ten FT-817ND + Miracle Ducker Package. Combining the glare of the FT-817ND HF with the Miracle Ducker offered at special price. Our FT-817ND south come with Metalhydride batteries, charger, mic & antenna. merely 499 ! or 36 x ( For the FT-817ND-DSP Version add 125 ) FT CD-24 + FNB-78 + QPAK We have put a package deal together that we think you can t afford to miss. A trade name new FT-897 Transportable Base rig with HF/6/2/70 all mood, home FNB-78 Battery, matching CD-24 DC Charger and the excellent QPAK ATU make this a must have for the long winter operating months. lone 999 or 36 ten VX-7R + CSC-88 A popular combination but with add value. The worlds most popular Tri- Band 6/2/70 5 Watt Handie. Offered with matching VOX Earpiece-Mic & Protective Carry Case. All for only 299 or 24 adam Yaesu VX-5R still a very popular option, the VX-5R has Tri-Band operation and offered with 5W lithium Ion Battery, charger & antenna. We ve slashed the price and made it an unbeatable offer ! only SAVE OVER 105 ! FT ATAS-120 Mega-Deal ! The best selling All Band Mobile/Base has even more entreaty that last calendar month you can add an ATAS-120 for 100 off RRP. alone 799 or 36 x FT-8900 with YSK-8900+HMC-4 FREE ! One-stop solution to high-power FM on 10m, 6m, 2m & 70cm. When your local repeater is busy, slip onto 10m & work DX ! The ML & S Package Deal includes : YSK-8900 Remote Head & cable assembly Maldol HMC-4 The best quad band mobile antenna money can buy. Call us 6 days a week, mon-sat facsimile : world wide web : alone 429 or 36 x local anesthetic call count Yaesu FT-1000MP mkv Field Ditto mkv but 100W and built in PSU. RRP : 1999 ML & S : 1739 Yaesu FT-2800M 2M brick-built 65W rig. RRP : 179, ML & S : 159 NEW Yaesu FT-60E Latest Twin Band 5W Handie from Yaesu merely 189 ! Yaesu FT-7800 Bar make the tea it ll give you 2m/ 50W/40W. RRP : 239, ML & S : 239 Yaesu FT-8800 Similar to the FT-7800 but can receive on 2 & 70 simultaneously. RRP : 289, or 48 adam 8.26 p/m Yaesu VX-2E Micro Handie 2/70 with scanner. complete withli-ion battery, charger & antenna. NEW LOW PRICE – now only 139 Yaesu VX-150 Built on the commercial VX-400, simpleton to use rugged 2m Handie, supplied with Nicads & Charger. RRP : 149, ML & S : 119 Take away nowadays and Pay NOTHING Until This Time next class ! ! Having many years of know offer specific finance packages for our customers, we can now offer diverse options on payment. We have added “ Take-Away now & Pay Later ” to all our products over 199. It works like this : 0 % APR An exemplar of our takeout now : Discounted price of 300. Pay no interest provided you pay by the date the measure is due, in wide. After the 12 months period has expired pay for 36 months. TAP Please eminence that interest is calculated from the date of the master agreement. 29.8 % APR. 
9 RADIO COMMUNICATION Contents DECEMBER CONTENTS 2004 Editor Steve Telenius-Lowe, G4JVG Technical Editor George Brown, M5ACN Secretarial Sarah Clark, M3GOA Advertising Design Jodie Escott, M3TPQ All contributions and parallelism concerning the contentedness of RadCom should be posted to : The Editor, Radio Communication, Lambda House, Cranborne Road Potters Bar, Herts EN6 3JE Tel : fax : advertising All display and classified advertising enquiries ( excepting Members Ads ) should be sent to : Chris Danby, Danby Advertising, 299 Reepham Road, Hellesdon, Norwich NR6 5AD Tel : ; Fax : ; RadCom is published by the Radio Society of Great Britain as its official journal on the first sidereal day of the relevant month and is sent free and mail paid to all members of the Society. shutting date for contributions, unless otherwise notified, is five weeks anterior to publication date. All material in RadCom is subject to editing for distance, clearness, style, punctuation, grammar, legality and taste. No duty can be assumed for the return of unasked material ( if in doubt, call us beginning ! ) RADIO SOCIETY OF GREAT BRITAIN 2004 Articles are accepted on the nonindulgent understand that they are not presently on offer to any other issue. Unless otherwise indicated the RSGB has purchased all rights to published articles. Designed and printed by Space Matters, 60 Borough High Street, London SE1 1XF. RSGB MEMBERSHIP Annual Rates Home Corporate Overseas Corporate Corporate ( Senior Citizens ) ( Applications should provide proofread of old age at last refilling date ) Corporate ( 50 years membership ) 50 % DISCOUNT Corporate ( 60 years membership ) FREE Family penis ( Must reside with existing member. Does not include RadCom ) scholar Members ( Applications should include evidence of full-time student status ) HamClub ( under 18 ) Affiliated Societies ( UK or Overseas ) p59 A modify switch-mode power provision. NEWS AND REPORTS 5 RSGB Matters Society news and developments. 7 The best HF Convention in years … John Gould, G3WKL, reports on October sulfur HF Convention at Gatwick. 10 RadCom News 18 survive call for the RCF charity raffle ! There s silent fourth dimension to enter the raffle, support the study of the RCF, and – possibly – win some capital prizes. 29 ML & S Open Day An open Day is being held at the new ML & S memory in Chertsey, Surrey on 4 December. We preview what you will find there. 47 RadCom volume 80 ( 2004 ) index 83 VHF NFD 2004 Andy Cook, G4PIQ, with the full results of the year s most popular VHF / UHF contest. DOWN TO EARTH – amateurish radio FROM THE GROUND UP 23 Newcomers News Compiled by Steve p83 VHF NFD Hartley, G0FUW. 24 Why HF radio waves travel around the globe In the first of a twopart series on HF propagation, Ian Poole takes a search at why radio receiver waves are affected by the upper reaches of the standard atmosphere. REVIEW 19 Four-way multi-band hand-held shoot-out Chris Lorek, G4HCL, compares the Alinco DJ-596, the Icom IC- E90, the Kenwood TH- F7 and the Yaesu FT- 60R. 81 Book review Hijacking Enigma by Christine Large, the Director of Bletchley Park Trust. TECHNICAL FEATURES 33 Technical topics Short doublets, inverted Vs & ground losses Balanced ATUs Simple unbalanced LC ATU 45 Whatever next Man south best acquaintance the rotter Sputnik s fiftieth anniversary addition digital voice 56 In practice Ian White, G3SEK, answers readers letters Stuck and sealed Replacing rectifier diodes Men in brown university coats II 59 Switch-mode power supplies, part 2 G3SEK concludes his bipartite look at the switch-mode exponent provision with a description of the secondary side of the independent power transformer. 62 The programmer and the cardinal, partially 2 Ed Chicken, G3BIK, presents more cardinal circuits based on PIC chips. REGULARS 12 Club & regional news 18 Supporters of the Radio Communications Foundation 38 EMC, David Lauder 44 Antennas, Peter Dodd 46 Data, Andy Talbot 65 HF, Don Field 67 HF propagation, Gwyn Williams 69 Contest, Tim Kirby 73 IARU, Don Beattie 75 LF, Dave Pick 77 QRP, George Dobbs 79 VHF/UHF, Norman Fitch 90 Members ads 90 Congratulations 90 Silent keys 91 Rallies & events 91 GB calls 93 the last word Subscriptions include VAT where applicable. especial arrangements exist for blind and disabled persons. Details and membership application forms are available from RSGB HQ. RadCom December 
10 NEWS A winter south narrative Olavi Veitola, OH5BR, of Imatra, Finland, has an unusual trouble most winters. He lives 300m from the River Vuoksi and when the weather is very cold the river feeds indeed much moisture into the air travel that it causes a enormous build-up of snow and methamphetamine on the OH5BR antenna. When one of those antennas is an 80m beam on a 36m-high loom, the burden of the accumulate methamphetamine and snow can present very real difficulties. Foundation licensees lead the room ! The prizewinners in the british Wireless for the Blind Fund Transmission 2004 ( fund-raise rival were presented with their trophies at the RSGB HF Convention on 23 October. Prizes were given for the groups and individuals who raised the most money for the charity and for those who made the most contacts during the weekend. The group or club raising the most money was the Poldhu Amateur Radio Club, which netted Olavi has solved the problem in an clever way. He writes : A 6ft axle is attached to the loom barely below the boom with bearings. The axle has welded plates at both ends and wooden blocks ( 2 ten 4 ten 20in ) are bolted to the plates. A nylon r-2 runs from the far end of the arm to the grind inside the loom. Pulling the rope makes the wooden hammers swing as the axle rotates. You create a very effective vibration to the wholly for the jacob’s ladder. The club that made the greatest number of contacts was the Cray Valley Radio Society, with a astonishing 3057 QSOs. The individual who raised the most funds for the BWBF was Daren Loxley, M3LOX, with 245, while the individual making the most contacts was Bob Palmer, M3DPQ, who quit when he achieved his personal aim of 100 QSOs. It is beneficial to see Foundation licensees showing the direction to more have amateur in this fun competition that raises money for such a full campaign. BWBF, launched by Winston Churchill in 1929, issues adapted radio sets for the blind and partiallysighted throughout the UK. BWBF Chief Executive Margaret Grainger, ex-g7sxd, said she was delighted by the efforts of all who took part in Transmission antenna system and column by swinging the rope and axle back and forth a couple of times before the actual hit on the boom. This break ice and allows the frosting and snow to fall to the reason. The pictures show a close-up of the hammers, the moment of shock, and the beam half a second gear after action is taken. Our front cover this calendar month shows the antenna three seconds after the boom is struck. Left to right : Graham Anthoney, GM0AAX, Anne Hood, GM4UXX, Jan Miller ( bridget ), Graeme Miller, G8JIP ( groom ), and Jack Hood, GM4COX, at the Donnington Valley Hotel in Newbury on 19 September Congratulations ! Amateur radio crowd control at bulk consequence Ganesha Chaturthi is an indian religious festival held every August / September in which effigies of the God Lord Ganesha are worshipped and immersed in urine. The biggest such ceremony is held in Mumbai ( Bombay ) at Girgaon Chowpatty beach, where millions of people gather on the night of the full daydream. With therefore many people, trouble is bound to brew and every year there are incidents. Mumbai Amateur Radio Society ( MARS ) volunteers VU2NLF, VU2NHR, VU3MWH, VU2JPN, VU3AUA, VU2OZO, VU2SFN, VU2HIT, VU2LUB, VU2GYM and SWLs manned look-out towers constructed along the route of the processions. Using VHF basis stations and 5/8-wave antennas on the towers, with hand-helds for the amateurs on the footing, an entire network was created to provide communications for police and government departments at the festival. MARS did a capital job locating parents of lost children, monitoring the crowd in the body of water and reporting swim cases, and getting the injured to first aid centres. Thanks to Shantanu Chand, an SWL presently awiting his VU license and one of the MARS volunteers, for this newsworthiness fib. Individual winner Bob Palmer, M3DPQ, receives a phonograph record and certificate from RSGB President Jeff Smith, MI0AEX, and BWBF Chief Executive Margaret Grainger. PHOTO BY ANKUR PURANIK PHOTO BY ANKUR PURANIK A minor separate of the estimated million people on Chowpatty beach. MARS volunteers on one of the towers. 10 December 2004 RadCom 
11 NEWS NEWS BRIEFS N Eddie, 2M0EDY, asks if he is the inaugural Foundation licensee to pass his callsign on to his son ? Eddie s son Peter passed passed the Foundation examination, becoming MM3EML, two months after Eddie passed the Intermediate. Eddie hopes grandson Jason will besides take out a foundation license and have the callsign passed on to a one-third genesis. Bob Parkes, G3REP, informs us that there is now an amateurish radio page on Sri Lanka Telecommunications Regulatory Commission web site ( thulium ), from where it is potential to apply for a Sri Lanka amateur radio license. There is besides a connection to the Radio Society of Sri Lanka web site. The new Waters & Stanton catalog was released in October. It contains 380 pages listing about every conceivable amateur radio intersection plus a total of general-interest amateur radio articles. It costs 2.95 and is available from W & S plc, 22 Main Road, Hockley, Essex SS5 4QS. In 1992 the first Amateur Radio Stamp was issued to record the first gear amateur radio operation from the Isle of Pabay, near Skye. Since then, respective other stamps have been issued with amateurish radio connections. Details of these and early Pabay stamps can be found on the Pabay web site at The UK mho foremost unattended storehouse and ahead single frequency voice relay became functional on 16 October. It operates on MHz using the callsign MB7FM, with a maximal store time of 120 seconds. The initiation is on an raised site in the Chiltern Hills at locator IO91PS, with 10dBW ERP from a dipole antenna at 32m above footing. Please air signal reports etc by e- mail to The future Club-TV amateur radio receiver plan broadcast on the Sirius 2 satellite at 5º east ( vertical polarization, SR 3400, FEC 3/4 ) will be at 1000UTC on 18 December. The two features in the program will be Airing Ailsa by GM4LVW and Venus Transit by S51KQ. The downlink frequency will be announced on bolic.se under Club-TV/HAM Radio in due course. SOTA newsworthiness Robin Morrison, GM7PKT, became SOTA s fourthly Mountain Goat when he went through the 1000 points barrier when activating Ben Nevis GM/WS-001. engagement in SOTA is reliant on the function of a personal computer with Internet connection, as this is how the chaser, activator Lottery concede for Northants amateur radio Guides last class Northamptonshire 77th Guides was awarded a 5000 lottery accord for equipment to train Guides to Foundation level and to run especial consequence stations to show Guides what amateurish radio has to offer. At this year second Jamboree on the Air, Guide Leader Sue Hall, M5AFY, with the girls of 77th Northampton Guides, made contacts as far John, M1SHE, and Emily Little just after finding their very first concealed sender on 2m. and SWL logs are submitted and the compendious scores calculated. For those without Internet access, Rob, G4RQJ ( QTHR ), offers a servicing of entering logs and providing periodic print-outs of the results for non-online participants. This is on a casual ad hoc basis, and anyone wish to take Rob up on his offer should contact him for details. afield as Tasmania. Some Guides sent Greetings Messages to equally many as 15 different contacts. John Chisholm, M5TTT, the radio teacher for the Northamptonshire guides, writes that all of the Guides in the photograph who do not already hold Foundation licences are on his adjacent course. Guide Leader Sue Hall, M5AFY, with the girls of 77th Northampton Guides at their JOTA station. ARDF newcomers John, M1SHE, and Emily Little travelled from Milton Keynes to Leicester to sample IARU-style commission finding at the Bagworth ARDF event on 10 October. Their receivers and aerials were loaned to them by David Deane, G3ZOI. The event involved a 2m DF in the dawn followed by three more hidden stations to find on 80m in the afternoon. The weather turned out better than expected and everyone had lots of fun. Horkheimer Prize 2005 Robin, GM7PKT, activating Beinn an Dothailh, GM/CS-025. Old radio for an old sign of the zodiac Mike Brett, M3JTX, recently moved to a farmhouse near Wisbech and decided to build the kind of radio that would have been found in the house when it was built, around the meter of the birth of radio. The consequence is shown below. It is a battery powered four-band re-formation radio ( mains electricity was a farseeing manner off for such a distant localization. Mike says he has tried to use old components where possible. The power requirements are 90V DC, 45V DC and 1.5V DC. An honest-to-god pair of 1920s headphones purchased on e-bay finishes it off nicely. There is no bulk manipulate, but the volume can be adjusted by careful manipulation of the front man tickler Spider Coil as it moves from side to side into and out of regeneration. With a long wire antenna and a good earth, it worked the first time it was switched on. Rudolf Horkheimer was one of the first radio amateur in Germany. The Horkheimer Prize is awarded by the german national club DARC for merits of amateur radio, its foster development and the targets of DARC. All members of IARU member societies are entitled to be nominated and self-proposals are permitted. The pry consists of an engraved glaze trophy and a monetary prize for non-personal consumption. Nominations, which should list the name and address of the proposed amateur, a short circuit confirmation, and any farther data, should be submitted to DARC, Lindenallee 4, Baunatal, Germany by 31 March The choice is awarded at the Ham Radio 2005 honest in Friedrichshafen. RadCom December 12 CLUBS Club and regional news Items for baseball club news should be sent to the RadCom Office at HQ to arrive by the 26th of the calendar month, ie approximately a calendar month before publication ( eg 26 January for the March Issue ). News items should be sent in write ( facsimile, letter or by the club secretary or the person responsible for publicity. Post cards for this function are available from RSGB HQ. A database of all meetings is shared between RadCom and GB2RS, so information only needs to be sent once. 1 Scotland South & Western Isles COCKENZIE & PORT SETON ARC 4, Club Christmas night ( TBC ). Bob, GM4UYZ, KILMARNOCK & LOUDOUN ARC 14, Bright Sparks quiz night. Len, GM0ONX, LIVINGSTON & DARS 4, Christmas knock. Mark, MM0MMK, , LOTHIANS RS 6, Curry night. Toby, MM0TSS, , PAISLEY ( YMCA ) ARC 8, Why Valves are not Extinct, GM4GZQ. No meeting on 22 December. Jim, GM3UWX. 2 Scotland North & Northern Isles No club details received. 3 north West CHESTER & DARS 14, Christmas social. Chris, MW3TWI, or Bruce, SOUTH MANCHESTER R & CC 3, Quiz. 10, Software applications. 17, Christmas party. The club is closed for the next two weeks. Ed, THORNTON CLEVELEYS ARS 6, On breeze. 13, Christmas party at Frank Townend Centre. 20, Distress Beacons, G4EZM. No meetings on 27 December and 3 January. Jack, G4BFH, 4 North East GOOLE R & ES 8, Christmas dinner at The Black Swan, Asselby. Richard, G0GLZ, GREAT LUMLEY AR & ES 1, 8, On air. 15, Christmas Dinner, Chilton County Pub & Hotel, Fencehouses. 22, On atmosphere. Nancy, ,, GRIMSBY ARS 2, New license, Carl, G7EOG. 9, Party night. George, G4EBK, HALIFAX & DARS 7, Quiz, Tom, M0TKA, plus supper. Tom, M0TKA, HORNSEA ARC 8, ‘Frequency Measuring and Standards ‘, G3RMX. 15, RSGB presentation, Andy, G0VRM. 22, Christmas party. adjacent meet 5 January. Richard, G4YTV, , KEIGHLEY ARS 9, On atmosphere. 16, Christmas buffet. Kath, G0OSA, NORTH WAKEFIELD RC 2, Quiz with Pie and Peas, John, G0EVT. 9, On air. 16, Christmas party ( music by NJW and the Morse Tappers ). See club web site. SHEFFIELD ARC 6, Video. 13, VHF radio. 20, HF on atmosphere. No meeting on 27 December. Nick, G4FAL, TYNE & WEAR REPEATER GROUP 8, AGM. Nancy, G7UUR, ,, WAKEFIELD & DARS 7, ‘Digimodes ‘, John, M0JOR. 11, Visit National Coal Mine Museum to see Santa. 14, BBC, Dave, G4CLI. 21, Christmas party at Ossett Community Centre. No meet on 28 December. Charles, M3ZYZ, , West Midlands BROMSGROVE & DARC 10, Surplus equipment sale. 17, QRP matters. Chris, M0BQE, COVENTRY ARS 3, EchoLink or digital modes ( TBC ). 10, On air, Intermediate, Morse practice. 17, Christmas social ( last meet of year ). John, G8SEQ, , GLOUCESTER AR & ES 6, Radio History – Acorn Valves. 13, Christmas buffet. Tony, ( day ). KIDDERMINSTER & DARS 7, Christmas social even. Tony, G1OZB, MALVERN HILLS RAC 9, AGM. Mike, G3TGD, SALOP ARS 9, Raynet. 16, Club Christmas dinner at Red Lion, Battlefields. 23, The Christmas heart with mince pies at club HQ. Fred, G3NSY, STRATFORD UPON AVON DRS 13, Surplus sale. 27, Festive chew the fat night. Terry, G3MXH, TELFORD & DARS 1, Open flush, HF on air travel. 8, How to do it ! A workshop practices evening. 15, TDARS Annual Dinner. 22, Bring your own, informal Christmas social. Club closed future week. Mike, G3JKX, , THORNBURY & SOUTH GLOS ARC 1, HF radio comparisons for all to see and hear. 8, Video. 15, Quiz, John, M1EON, bun competitiveness. Stan, G0RYM, 6 North Wales DRAGON ARC 6, Introduction to club FT, Informal Christmas party. Les, MW0AQZ, MEIRION ARS 2, AGM. Martyn Jones, GW4XZJ. 7 South Wales CHEPSTOW & DARS 7, Social evening to celebrate the for mation of the clubhouse. Steve, GW8ZOE, SWANSEA ARS 2, AGM. 16, Annual dinner at Clyne Golf Club. May, GW3OMN, 8 Northern Ireland BANGOR & DARS 1, Wire Antennas, Harry, GI4JTF, and ARGONI Update, Mike, GI4XSF. Mike, GI4XSF, [ 9 London & Thames Valley AYLESBURY VALE RS 8, Chairman s mince proto-indo european evening. Roger, G3MEH, , CRYSTAL PALACE R & EC 3, Christmas quiz, clear forum and mince pies. Bob, G3OOU, or Victor, G1PKS, DORKING & DRS 9, Annual dinner. John, G3AEZ, RADIO SOCIETY OF HARROW 3, Construction contest. 17, Christmas social. Jim, G0AOT, , SHEFFORD & DARS 2, 3B9C : DXpeditioning for the first time, John, G3WKL. 16, Mince pie even. David, G8UOD, SILVERTHORN RC 3, HF beacons, Les, G0CIB. 17, Christmas party ( TBC ). Les, G0CIB, SOUTHGATE ARC 9, AGM. Mike, M0ASA, STEVENAGE & DARS 7, Modems. 14, Christmas dinner. SUTTON & CHEAM RS 9, Christmas junk sale ( please note date ). John, G0BWV, , WHITTON ARG 3, On air. 10, Christmas dinner. 13, Advanced license examination. 17, 24, On atmosphere. G6VZM, WIMBLEDON & DARS 10, Christmas social. Jim, M0CON, South & South East BASINGSTOKE ARC 6, Ladies night. 27, ARDF foxhunt turkey settler, Janet, G6JDP. Frank, M0AEU, BURNHAM BEECHES RC 6, Christmas meal. 20, Video evening. Ian, M1FHU, , FAREHAM & DARS 1, On air. 8, How does it work ? The linear acceler ator, Peter, G8TXK. 15, 10-min talks for Christmas and New Year. 22, Mince pies. No meet future week. HARWELL ARS 14, AGM. Angus, G0UGO, December 2004 RadCom 
13 CLUBS HORNDEAN & DARC 14, Christmas meal. Stuart, G0FYX, HORSHAM ARC 2, AGM. David, G4JHI, ITCHEN VALLEY RC 10, Christmas high gear jinks. Sheila, G0VNI, , SOUTHDOWN ARS 6, Christmas dinner at Toby carvery. 9, G0DOF contest at John, G3DQY, , SWINDON & DARC 2, Digital photography techniques, Den, M0ACM. 16, Christmas dinner. 23, Inter-club fun quiz. Mike, M5CBS, TROWBRIDGE & DARC 1, Christmas social & presentation night. Ian, G0GRI, ( evenings / weekends ). WORTHING & DARC 1, See the club s newfangled IC-7400 in action. 8, Christmas What Is It ? quiz. 15, Club awards and Christmas party. Roy, G4GPX, South West & Channel Islands APPLEDORE & DARC 20, Christmas party. Brian, M0BRB, BOURNEMOUTH RS 3, Chairman ‘s pint. 17, My other Hobby. Chris, M5AGG, , CITY OF BRISTOL RSGB GROUP 13, Grand Christmas party. Martyn, G3RFX, CORNISH RAC 2, Christmas party. John, G4LJY, EXMOUTH ARC 8, Mast erection, Ray, M3RTB. 22, Christmas party. Mike, G1GZG, NORTH BRISTOL ARC 10, Christmas party ( TBC ). Dick, G0XAY, , Jon, PLYMOUTH RADIO CLUB 4, Rooster breakfast at Trago ‘s, Liskeard. 21, Sherry and mince pie evening. Frank, G7LUL, SOUTH BRISTOL ARC 1, Computer & Software Clinic, David G7PKJ. 8, Feeder cable television sale, Len, G4RZY. 15, Christmas social, Muriel, G4YZR. 22, Celebrating a record year, Fred, G7LPP. 29, On air travel. Len, G4RZY, SOUTH DORSET RS 4, Skittles & buffet at Lugger Inn, Chickerell. Carol, 2E1RBH, , RadCom December 2004 TORBAY ARS 17, Christmas party and inter-club quiz. Dave, G6FSP, WEST SOMERSET ARC 7, Quiz. Jean, G0SZO, WESTON-SUPER-MARE ARS 6, Construction night. 20, Christmas party. D Welch, G0ATD. YEOVIL ARC 2, ‘The CR-100 Receiver ‘, G7LNJ. 9, ‘Protective Multiple Earthing ‘, M3HIR. 16, Christmas photograph quiz, M0WOB. 23, Mince pies on the air. 30, Festive on tune. Derek, M0WOB, , 12 East & East Anglia BRAINTREE & DARS 6, On air. 20, Christmas social. John, M5AJB, CAMBRIDGE & DARC 10, Christmas party. Club closed till 7 January. Ian, G4AKD, CHELMSFORD ARS 7, Social evening ( ticket only ). Martyn, G1EFL, COLCHESTER RADIO AMATEURS 2, Beams, Alan, G0HKG.16, Inter-club conventionality, open to all. James, M0ZZO, FELIXSTOWE & DARS 13, Christmas attic, video recording. Paul, G4YQC, HARWICH ARIG 8, AGM & Christmas party. Tony, G4EYE, HAVERING & DRC 1, Local history, Hornchurch airport in WWII. 8, On breeze. 9, Christmas dinner, the Harvester, Abb s Cross Lane. 15, Construction contest ? 22, Christmas refreshments. Oliver, G3TPJ, NORFOLK ARC 1, spill by County Emergency Planning Officer and Raynet. 8, Tuition, construction, informal. 15, Christmas party. Reg, G0VDO, East Midlands DERBY & DARS 7, Junk sale. 21, Christmas social ( no meet future week ). Martin, G3SZJ, EAGLE RADIO GROUP 14, Review of 2004, plans for 2005, elec tion of officers. Terry, G0SWS, LEICESTERSHIRE REPEATER GROUP 6, On atmosphere, junk sale. 13, On atmosphere, video recording. 20, Sherry & mince pies ( no meet on 27th. ) Geoff, G4AFJ, LOUGHBOROUGH & DARC 7, Thoughts for future build projects. 14, Fun quiz. 21, Pre-Christmas drinks, Black Swan, Shepshed. Chris, G1ETZ, MELTON MOWBRAY ARS 17, Mini-talks, trophy presentations, Christmas festivities. Phil, G4LWB, SOUTH NORMANTON, ALFRETON & DARC 6, Christmas party, all family welcome. 13, Christmas on-foot 2m foxhunt, fish & chip supper. 20, Santa s junk sale. 27, On atmosphere. Mike, M0RMJ, , LIKE FATHER, LIKE SON Dave Cree, G3TBK, recently won the CDXC Penallt Trophy for his DX work on the moo bands. not to be surpass, his son Edward, M3TBK, was one of the winners of the Nevada Rodrigues Trophies, as a Foundation licensee making the most contacts with the 3B9C DXpedition. Congratulations to both ! CDXC ( Chiltern DX Club ) – The UK DX Foundation ( – is a national company affiliated to the RSGB. KIND-HEARTED CLUB The Cockenzie & Port Seton ARC s annual presentation of money raised for the british Heart Foundation took space on 1 October. Heather Gregory, Regional Organiser for the BHF accepted a check for from cabaret president Bob Glasgow, GM4UYZ. Over the past 11 years the club has raised 10,392 for the charity. JOTA IN DUNDEE Edward Cree, M3TBK, and church father Dave, G3TBK, with their trophies. Bob writes : It is bang-up to see that something good can be put back into the community from our fantastic hobby. The hobby takes many knocks from people who are not prepare to do anything for it. therefore to all amateurs : don thymine knock the avocation, think positive and drive this hobby advancing in a positive light ! Left to right : Colin Smith, GM0CLN ; Bob Glasgow, GM4UYZ ; Heather Gregory of the british Heart Foundation, and Cambell Stevenson, MM0DXC.. Jamboree on the Air ( JOTA ) is an annual consequence that allows around 500,000 members of the Scout campaign cosmopolitan to communicate using amateur radio. JOTA has taken place since 1958 and is held over the third gear full weekend in October every class. Dundee Amateur Radio Club Dundee JOTA station GB4DAS with four ( enthusiastic listeners. president Tom Harrison and secretary Martin Higgins attended Douglaswood Scout Centre near Forfar to help 45 Scouts from respective Dundee Scout troops participate in JOTA and obtain their Communications Badges. 13 
14 CLUBS NEWS FROM DOVER CLUB The Dover Radio Club has recently completed another Foundation course. One of the students who passed was nine-year previous Katie, from Hawkinge, near Folkestone. In the photograph Katie is seen with Tony, G4IMP ; Lead Instructor David, G0DQI ; and Cecil, G0OJZ. Katie has precisely received her callsign – M3XPO – and is tidal bore to get on the vent with a newly dual-band hand-held bought for her by her parents. The Dover Radio Club meets every Wednesday during terminus clock at the Boys Grammar School in Dover, and hosts a mixture of talks and demonstration a well as providing educate courses. For more data visit Katie, M3XPO, with Tony, G4IMP ; Lead Instructor David, G0DQI ; and Cecil, G0OJZ. BRATS GOING FOR RTTY GOLD Bredhurst Radio And Transmitting Society ( BRATS ) made a dangerous club entrance in the CQ WW RTTY contest in September. Their aim was to make over 1000 RTTY contacts. The station was loaned by Neil, M0FSH, and consisted of a Yaesu FT-1000MP MkV, Acom linear amplifier, ATU, bandpass trickle and Toshiba laptop running Writelog / MMTTY. The clubhouse provided a caravan and an operational / social tent. Being very cold on site the operate camp was heated by an oil-filled radiator. Operators included M0FSH, G7MMF, G4VSZ, 2E0HRX, M1WPB, 2E0RIO, 2E0AXN, G3VCP with G6YLW, 2E0SRA, G4VSZ, G7MMF, G3ZSU, 2E0RIO, G0LJD, 2E0AXN, M3MLR, M0DKT helping as loggers. The G0BRC/P team achieved their prey of over 1000 contacts and a claim score of over 1,000,000 points. 14 busy TIMES FOR GU DRRM It has been a busy period recently for Guernsey Deputy RSGB Regional Manager Bob Beebe, GU4YOX. Bob ran an intercede path in Guernsey for four months and the two candidates passed with flying colours in September. Earlier in the year, Bob took part in the 3B9C DXpedition ( see RadCom July 2004 ) and was on the planning team for the stumble. He has been presenting the 3B9C narrative at many rallies and venues throughout the state. Bob besides travelled to Bologna, where he presented the 3B9C story in italian at FROM AMATEUR TO PROFESSIONAL RADIO Guernsey DRRM Bob Beebe, GU4YOX, with Rt Hon Michael Portillo MP, at Gatwick Airport. their national convention. It took place in Marconi s home at the very heart of where radio receiver started, and I felt very honoured to be there, he said. On the way to Italy, Bob happened to meet Michael Portillo at the airport. Bob took the opportunity to explain that amateur radio is very much alive and kick back and Mr Portillo was particularly matter to to hear about Bob s DXpeditioning activities. Bob was please to celebrate 30 years with the RSGB earlier this class. His busy schedule continued as he was the MC for the Gala Dinner at the RSGB HF Convention in October. David, M1AEI, on the air at Gemini. Torbay Amateur Radio Society ( TARS ) was recently given a guide tour of the studios of Gemini Radio. The studios are in a cage suspended from a steel model, about like a lift going nowhere, in order to stop any randomness or vibration being transferred to the studio from the road or harbor. The window looks out across the harbor towards Brixham and the presenters get an excellent position across the bay. The TARS members wrote a assumed news detail that was read by David, M1AEI. The commemorate was then edited as if it was a real number newsworthiness item for broadcast, complete with jingles and music intros. All the mistakes were edited out by digital serve, unlike in the old days when cutting and splicing videotape was the merely way. The eat up article sounded very professional. What surprised all the TARS members was the complete lack of turntables, CDs or records in the studio. All the music is stored digitally and produced from computers either locally or in Bristol. NEWS IN BRIEF The Bromsgrove and District ARC will celebrates its fortieth anniversary future class. especial activities will take place during the class, with a particular event post in June. Any by members who would like to attend these events are asked to contact the secretary, Chris, M0BQE, on The Midland Amateur Radio Society ( MARS ) is now running classes on demand for the Foundation, Intermediate and Advanced licences, adenine well as an amateur radio constructional course, from its HQ in central Birmingham. Exams take set at approve premises in Kings Heath. Full details from the MARS secretary, tel : or James Mahoney, M0MHY, of the Rose and Crown Radio Club in Barnsley, writes to say that the baseball club should concisely be holding an intermediate course followed by another Foundation class for its younger members aged between 7 and 11. Congratulations to father Allan Davies, and son Philip Davies on passing the Intermediate examination on 21 September at Hoover ARC Merthyr Tydfil. Both are nowadays studying for the full license. Further details of courses in the Merthyr Tydfil sphere can be obtained from James Sneddon, MW0EQL, tel : or or Stirling & DARS has a raw web site at The club meets every Thursday at 7.30pm at Bandeath Industrial Estate, Throsk, near Stirling. New members welcome. The baseball club celebrates its twenty-fifth anniversary in 2005 and is hoping to take partially in contests and special event stations throughout the year. On a holocene trip to Jersey, Judith Brooks, G4IAQ, and Dave Brooks, G4IAR, operating with club callsign GJ4LAB/M and /P, took the opportunity to activate numerous navigational lights and lighthouses on the island. The natural process was for members of Worked All Britain ( WAB ) and the british Amateur Radio Lighthouse Society ( BARLS ). further information regarding these two organisations can be found by visiting or December 2004 RadCom 
15 RSGB SHOP RSGB Lambda House Cranborne Road Potters Bar Herts. EN6 3JE Tel Fax ORDER 24 HOURS A DAY ON OUR WEBSITE Radio Propagation : Principles & Practice An all-important learn for anyone associated with radio communications. 112 pages, size : 174 x 240 millimeter, ISBN : Members Non Members only plus phosphorus & phosphorus HF Amateur Radio The HF or short-change wave bands are one of the most interesting areas of amateurish radio receiver. 128 pages Size : 240 ten 175mm, ISBN : Members Non Members Amateur Radio Mobile Handbook The Amateur Radio Mobile Handbook covers all aspects of this popular function of the hobby. 128 pages Size : 240 adam 175mm, ISBN : Members Non Members THE AMATEUR RADIO OPERATING MANUAL By Don Field This 6th edition of the RSGB Amateur Radio Operating Manual has been completely update and redesigned this edition reflects the huge changes in avocation in holocene years. The impingement of license changes and the ubiquity of PCs and the Internet are good some of the challenges in the hobby in the twenty-first Century. To deal with these, RSGB Amateur Radio Operating Manual has a wholly fresh expression at the content and approach. For case, some of the traditional demarcations between HF and VHF and between the respective operating modes have been overturned. New and comprehensive chapters can be found on topics such as PCs in the Shack and Operating Modes. There is besides a huge sum of new material included, for exercise, the 136kHz and 5MHz allocations, new data modes and the WSJT software cortege, APRS and VoIP. Much of the reserve has been heavily updated and there is a complete rewrite of the chapter on Satellites and Space communications. If you are concern in amateurish radio the RSGB Amateur Radio Operating Manual is the book you should not be without. This book provides a comprehensive examination steer to operating across the amateur radio spectrum. Packed with information and tips this book has long been a standard character ferment found on the bookshelf of radio amateurs. The moo Frequency Experimenter ‘s Handbook For amateurs and experimenters who have an interest in low power radio techniques below 200kHz. 146 pages Size : 296 x 210 millimeter, Members Non Members Yasme This is the history of 3 travelers spanning the birth of YASME — the boat that carried young boater Danny Weil on his first base voyages beginning in pages. ISBN : Members Non Members The RSGB Amateur Radio Operating Manual is a valuable summation to your bookshelf and the must have reserve for everyone concern in amateur radio. Size : 210mm x 297mm, 224 pages, ISBN plus p & phosphorus Non Members Price All prices plus phosphorus & p 
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18 NEWS FEATURE final call for the RCF charity raffle ! There s distillery time to enter the grand Radio Communications Foundation raffle, with some great prizes up for grab. n stopping point calendar month s RadCom you should have received five raffle Itickets. There s still time – good – to enter the RCF Charity Raffle, as the shutting date is not until Tuesday 30 November. The raffle is to raise funds for the Radio Communications Foundation which, among other things, funds the GB4FUN mobile amateur radio demonstration fomite. To find out more about the crucial sour of the RCF, take a expect at the web site at THREE STAR PRIZES There are no fewer than three Star Prizes in the raffle : an Icom IC-703 transceiver, a Yaesu FT-817 transceiver and a Kenwood TM-D700 transceiver. In addition, there are many other great prizes, including RSGB books. A brief description of the three asterisk prizes, which were kindly donated by Icom ( UK ), Yaesu ( UK ), and Kenwood ( UK ), can be found on page 15 of the November RadCom. note that the winners of the three Star Prizes must have an amateurish radio license before transmitting on the publicize. HOW TO ENTER The tickets cost 1 each. All you have to do to enter the raffle is to return the counterfoils distinctly marked with your appoint, callsign ( if applicable ) and address, along with a check for the appropriate sum. Send the cheque and counterfoils to Radio Communications Foundation Raffle, c/o RSGB, Lambda House, Cranborne Road, Potters Bar, Herts EN6 3JE, to arrive not former than Tuesday 30 November. If for some reason you did not receive any tickets with your November RadCom, don thymine concern ! Tickets are available on-line at or on request from RSGB HQ ( tel : ). You may buy any number of tickets you wish and extra tickets can besides be purchased on-line or from RSGB HQ. You do not have to be an RSGB penis to enter, and members can help the exploit of the RCF by selling raffle tickets to nonmembers of the Society. The draw will take seat at the Annual General Meeting of the Radio Society of Great Britain, to be held at the Institute of Chemistry, London, on 4 December and it is planned that the prizes will be delivered to the winners in good time before Christmas. A number of the winners will be published in the February RadCom. The RCF finances the GB4FUN mobile amateur radio demonstration vehicle. The Mayor of Lutterworth, Neil Ackerley, G3RIR, is seen here with GB4FUN project director Carlos Eavis, G0AKI, when GB4FUN visited Lutterworth Carnival in August. Supporters of the Radio Communications Foundation We asked members when renewing their membership to include a contribution to help to continue to support the work of the Radio Communications Foundation. The follow is the list of those members who have charitable sent in a contribution by the deadline date this issue. Contributions continue to be wanted : if you would like to help, please send your contribution to RCF, c/o RSGB HQ. RCF Big Hitters 7th Epsom ( Methodist ) Scout Group Northampton Radio Club I Flemming, G3ZDQ P J Banbury, G8BNK A J Wilkinson, GW4PVU H A Jarvis, RS27376 A E Keenan, 2E1GWJ M J Hickford, 2E1MJH J P Ketch, EI2GN P Maher, EI3AV G Lefebvre, F6AGS Mrs M Burchmore, G0ARQ S R Tricker, G0AZP T M Sherriff, G0CHV F Beesley, G0EYJ A Harding, G0HVT D J H Chalmers, G0IYE S W Nichols, G0KYA Rev F G Bligh, G0MTA L J Goddard, G0MVB G A Nattrass, G0OGD M J Payne, G0OGU W Hargreaves, G0PLG A C Dennis, G0PZX A A Robinson, G0RLW B Hillman, G0UXO D Wood, G0VIK H Yearl, G0WKI D A Winkley, G1DYC G E King, G1HXN D A Keable, G1ICA C Rickerby, G1NWA P V F Beardow, G1SHV R Dowdeswell, G1WIW D Goyder, G2SZ J R Andrews, G3APU R L Knight, G3DPW C Tamkin, G3EWT E A Matthews, G3FZW B J Mase, G3GLA F J Tooley, G3HPB M J Griffin, G3IIN A A Chisholm, G3INL E W G Allen, G3JHP A Parker, G3KAG D Webber, G3LHJ K A V Hurrell, G3NBC T M George, G3NJG D W Blackford, G3NPB J M Jones, G3UED S Tudor Jones, G3UMZ W F M Hahn, G3UOL L Hoskins, G3VN J A Arscott, G3VSL A Strong, G3WXI R W S Hewett, G3XLU Otley ARS, G3XNO K R Brooks, G3XSJ A F Hydes, G3XSV J C Hill, G3XYH S Hunt, G3YQ S H Bassford, G3YZB J Swanson, G4CBD M W Viner, G4CJJ K G Knight, G4DFZ J P Ball, G4DPI I A Welburn, G4EMA C V Redmayne, G4GLW D J Barrott, G4GVN J M Butcher, G4GWJ B D Clarke, G4ICB M H Parker, G4IUF V A Tomkins, G4KEE D A Holmes, G4KIZ Prof J M Nelson, G4KLA B R Lawrence, G4LSL R Greengrass, G4NRG J E Vivian, G4PBN R Goulden, G4VDY S H Aust, G4YBI G S C Crabbe, G4ZFN P Tarmey, G6AZL P C Bridges, G6DLJ D M King, G6KWA A J Florence, G7CDK R D Mount, G7DOE M G Phillips, G7EUK E T Cloude, G7FAQ B G Whittock, G7IYA D Remnant, G7LXP D M Gee, G7NAP R A Hoggard, G7PUL N Waterman, G7RZQ D Robbins, G8DKF M Richards, G8GVK A N Malbon, G8MIA N E Brown, G8NCK R H Band, G8NUG A F Jeffery, G8SIG A Lambert, G8TNU R A Clarke, G8UNO A Crowther, GD0MWL R McAteer, GI4MFM H Warke, GI6GAQ C Ashdown, GM0FHF Mrs I B Birkett, GM0FTX J P Power, GM0KTO C Mackay, GM0KVD J Y Merson, GM4MOA J L Mac Donald, GM4XZN D Brown, GM6JUA M Glendinning, GM7GIS P Glanville, GM7JFR R McLennan, GM8BQY B W Parsons, GW0KZK T Higginson, GW3AHN J Brace, GW3JBZ D Harris, GW3NDR W J Elton, GW3RIH D S Daymond, GW7AVB PHOTO : JANETTE ACKERLEY, G8TKQ 878 Squadron ATC, Highworth, M0ATC Mrs L M Taylor, M0CMK G K Hyde, M0CTP J A Chaldecott, M0CZQ R Chick, M0FAK G Gash, M0GUD J J T O Toole, M0HEM T E Thomas, M0VAB K R Austen, M1AZO K Broxup, M1BVQ A C Moore, M1CFZ E Roberts, M1EWH J A Bradford, M3EPU K W Buxey, M3KBX R C Goody, M3OBO B E Upton, M3RBU J Child, M3WXE P Smiley, MI0PJS L Paschalis, MW3FJL R J Ramm, RS G Bowden, RS D L Mann, RS R Nottage, RS J Fleet, RS P Ford, RS R Hall, RS B Kehoe, RS193643/EI A B Siddall, RS A J W Rozelaar, RS4590 R I H Scotland, RS93531 A C F Smith, VK6CPV J Troup, WA6JYU The RSGB is besides grateful to those many generous members who have sent donations anonymously, or who have asked us not to publish their names. 18 December 2004 RadCom 
19 Reviewed by Chris Lorek, G4HCL REVIEW PO Box 400, Eastleigh SO53 4ZF. Four-way multi-band hand-held shoot-out Chris Lorek reviews and compares the very latest models of VHF/UHF handhelds from the large four manufacturers. DJ-596 IC-E90 TH-F7 FT-60R Freq Coverage TX Freq Coverage RX TX Power Output 4.5 ( 4 ) /0.5W 5/0.5W 5/0.5/0.05W 5/2/0.5W Cross Band Split Yes No Yes No Dual Receive No No Yes No Simultaneous Cross BandNo No No No Automatic Repeater ShiftNo No Yes Yes FM Narrow TX Yes Yes Yes Yes FM Narrow RX Yes No No No AM RX No Yes Yes Yes WFM RX No Yes Yes No SSB RX No No Yes No Memory Channels Memory Scan Yes Yes Yes Yes Smart Search No No No Yes Priority Scan Yes Yes Yes Yes Memory Tuning No No No Yes Memory Banks Alpha Tag Yes Yes Yes Yes Search Bands RX Audio Output 200mW 200mW 300mW 400mW CTCSS Encode Yes Yes Yes Yes CTCSS Decode Yes Yes Yes Yes CTCSS Search No Yes Yes Yes DCS Encode Yes Yes Yes Yes DCS Decode Yes Yes Yes Yes DCS Search No Yes Yes Yes DTMF Encode Yes Yes Yes Yes DTMF Memories 9 10 Yes 9 DTMF Decode No No No No Auto Power Off Yes Yes Yes Yes RX Battery Saver Yes Yes Yes Yes Internal VOX No No Yes No PC Cloning No Yes Yes No Size 56x124x40 58x87x29 58x87x30 58x109x30 Weight ( actual ) 330g 295g 260g 370g typical Price or many amateurs, their first transceiver is frequently a VHF / FUHF hand-held, and flush if your interests chiefly lie in nucleotide or portable HF process, a 2m ( 145MHz ) or 70cm ( 433MHz ) hand-held is frequently a subsequent purchase, if only for keeping in refer with the locals. There are few areas of the UK that are not now within the coverage of a VHF or UHF repeater. Simplex channels on 2m are frequently used for RadCom December 2004 club nets, one-to-one technical discussions, GB2RS news broadcasts and mobile tease talk-in. The magic trick ring of 6m ( 50-52MHz ) has besides seen an increase in FM activeness together with a count of repeaters which are immediately serving diverse areas of the UK. Plug the hand-held into a simple outdoor collinear antenna and your horizons widen significantly in terms of communication range. On the affect, add a magneticallymounted mobile antenna and the hand-held transforms into a mobile rig. Some external circuit board speakermics offer limited distant control in addition to the common PTT ( push-totalk ) and respective hands-free units are besides commercially available. You can even use some hand-helds in VOX mood for accomplished hands-free communications. many readers are besides avid listeners, and today s handhelds often feature wideband receive capabilities, sometimes even including HF and multimode CW / SSB / AM / FM / WFM reception. The performance on HF will not be that of a dedicate base HF outfit, but could be utilitarian for listening to HF air stations while you re on vacation. Scanner enthusiasts are of path well catered for with a combined transceiver and scanner ! REVIEW MODELS For this review, we ve chosen a cross-section of the latest models of VHF / UHF handhelds from four different manufacturers. Rather than in full detail the facilities of each and take up a significant separate of this calendar month s magazine, the accompanying comparison graph gives you an at a glance list of the handiness of assorted operating features of each 19 
20 REVIEW hand-held. Each radio besides has its own alone features, which are individually detailed in the reappraisal text for each model. vitamin a well as testing the radio receiver from my home area, each accompanied me on at least respective hundred miles of travel by either road, rail, air and sea around the UK and mainland Europe to provide a thorough trial. ALINCO DJ-596 The DJ-596 is physically the largest of the handhelds tested here, although Alinco does besides manufacture ultra-tiny hand-held transceivers, like the low-power dualband DJ-C7E which will be the subject of a extroverted RadCom review. The DJ-596 is a multi-featured hand-held that fits nicely in your hand, and is the only one of the four with a BNC socket fitted for easier connection of an external antenna. Just some of the singular features are a switchable mosquito repellent ( ! ) which produces an supersonic tonicity in an campaign to dispel the insects, and a larceny alarm clock which sounds when a laborer plug, which would be typically be secured by cord to another object, is unplug. equally well as having switchable narrow FM deviation for 12.5kHz channel spacing as used on 2m, it besides switches in a narrower percolate on receive to give far good 12.5kHz adjacent channel sign rejection. I found the radio receiver by and large easy to use on air out, and the click-step traffic circle knob normally acted as a transmit / frequency change. But each time I wanted to change the pick up book I needed to press the lower left Vol push button on the keyboard first base, and then use the knob to change the grade, which I found a spot of a pain. There was plenty of goodsounding audio from the inner loudspeaker, and I appreciated the fact that I could leave the rig set to constrict FM on 2m and normal FM on 70cm, getting best-of-both-worlds performance on each band. When powered by its clip-on battery pack the transceiver is stated to give around 4.5W out on 2m and 4W on 70cm, but plugging in an external 13.8V DC add in my car increased this by around a watt on each dance band. This was besides utilitarian in topping up the battery, as although the nickel-metal hydride type was physically larger than the other hand-held batteries, with a capacity of 700mAh at 9.6V it had a slenderly lower capacitance than the others. even without reading the manual first I found the radio was intuitively easy to use, the computer keyboard logos being self-explanatory and most functions were no more than a twobutton push. For night-time use, the lamp facility illuminated not only the display but besides the computer keyboard, and the keys were large adequate to use with gloved hands. Although the specifications say that the receiver covers just the 2m and 70cm amateur bands, in practice I found it covered a broad range of and MHz. With a fair amount of audio from the inner loudspeaker and good reports on my familial signal, the DJ-596 proved itself to be a identical adequate to on-air performer. ICOM IC-90E not only is the IC-90E a 2m / 70cm dual-bander, but it has the addition of 6m transceive capabilities. The add coiling whip with its SMA connection has a short-change screw-off top section for 2m and 70cm habit, which is replaced with a chunkier top-loading section, as shown in the photograph, for 6m use. It includes a broadband receiver angstrom well, covering medium curl right astir to 1000MHz with AM, FM and Wide FM modes. A 1300mAh Lithium-Ion rechargeable battery is supplied. A top-panel synchronous converter click-step knob is complemented by a copulate of big up / down buttons on the fascia. In convention use, the circular knob is the frequency / distribution channel exchange control with the up / down buttons altering the receive volume, but these can be transposed if you like. alternatively, whilst pressing one of the up / down buttons the synchronous converter node is temporarily converted into a volume control. Despite the small loudspeaker, the audio was quite clear although in noisy surroundings I found I had to hold it nearer to my ear. The translucent computer keyboard buttons were raised and with a haptic feedback for easy use, and although I had no problems at all, some users with large fingers might find them a little challenge. The display was very clear with big digits and selectable green, orange or crimson backlighting, with the band release scrolling between nine isthmus ranges, three transceive and six general coverage receive each with their experience modes mechanically switched. There s tied a built-in Morse code readout of the operate frequency should you want to use this. The provide belt out nip is a swivel type, one part clipping on your knock and the early screwed on to the transceiver, allowing a quick free arsenic well as a 360º swivel. No fewer than 18 memory banks, each able of storing up to 100 channels from the available 500 were available ; great for sorting diverse amateurish and broadband heed interests for monitoring and scanning. For many less-used preset operating modes a set function is used, this besides includes FM narrow or normal convey diversion which I initially had to change constantly depending on whether I was using 2m or 70cm at the fourth dimension ; it s not possible to have this pre-stored as constrict TX deviation on 2m and normal TX deviation on 70cm. finally I fair left this at convention and merely spoke a little farther away from the microphone on 2m ! The 1750Hz toneburst diversion in normal deviation mode might possibly fail to open the episodic 2m repeating firearm although I had no problems hera, but if so I could of course have either switched to narrow or used CTCSS for access. In use I had enough of contacts on 2m and 70cm, but I besides appreciated the 6m capability which gave me contacts on my travels around the UK which I m sure I d have otherwise missed. I even used the radio on a brief visit to Geneva to have a few concern contacts, a well as listening to news from back home on the HF broadcast bands. An internal 10dB receive attenuator can be switched in to prevent overload from potent signals. For external baron operation, not more than 11.5V must be plugged into the side connection, although Icom offers an optional CP-19 reducing agent for in-car or base operation. An optional distant control microphone can besides be connected, which allows up / down frequency / channel control condition a well as set switch over and two far buttons which act as isthmus and VFO 20 December 2004 RadCom 
21 REVIEW / Memory toggle switch or two other preset selections. KENWOOD TH-F7E At around the lapp size, slant, and price of the IC-90E, the TH- F7E offers 2m and 70cm transceive, together with coincident dualfrequency reception using two VFOs each with their own freestanding frequency display plus a broadband receiver on the lower B VFO frequency display. ampere well as a set-top SMA terminated coiling antenna, there s besides an inner ferrite rod bar antenna, mounted horizontally at the al-qaeda of the transceiver, which can be switched into operation for reception below 10.1MHz. It besides offers CW, LSB and USB reception below 470MHz with tuning steps down to 33Hz, so you can even tune into amateurs and others on the HF bands. The receive coverage extends right up to 23cm ( 1300MHz ) and in the UHF ranges a variable RIT ( Receiver Incremental Tuning ) facility of up to ±5kHz can be used to pull in slightly off-frequency signals. Narrow and normal FM convey deviation is selectable and stored on a band-by-band basis, and by using the double VFOs you can even simultaneously monitor two frequencies on the lapp band. If dualreceive gets besides complicated, the radio receiver can be switched into singleband process if you wish. A small four-way rocker key in concert with a center OK push button is used to navigate through the assorted menu, the dot-matrix LCD providing text-based details of the menu settings. A small but high-capacity Lithium-Ion battery clips on to the rear empanel. A dual-concentric rotary knob is fitted to the crown panel, the out is a standard analogue receiver volume control, the inner knob is a click-step type for frequency / impart variety and for changing versatile menu settings. A press of the small Sql keypad button followed by a wind of the click-step node adjusts the squelch level, a bar-graph of the degree being shown on the expose. In practice, I found my impart signals to be excellent, and although there was batch of receive audio I m tempted to say it did sound a short tinny from the belittled RadCom December 2004 but identical robust internal loudspeaker. flush so I found the radio very handy for broadband listen, again an inner switch attenuator was fitted ( which operated on both VFO bands simultaneously ) which helped signal readability on, say, 40m SSB in the bearing of nearby broadcasters with an external wire plugged into the antenna connection. The AM filter is used for SSB / CW, which although a little wide I found that with careful tuning was quite reasonable for such a bantam doeverything transceiver / receiver. For repeating firearm practice, a well as a quick input bridle by pressing the Rev keypad button, a longer press of this placed the set into an automatic pistol simplex discipline mode, where the liquidator sporadically checked the remark distribution channel to see if a steer contact was possible. About the lone thing I found a flimsy trouble here was a changeless weak inner spurii on MHz ( R0 input ). For fluid or hand-free portable consumption with a headset, built-in VOX can be used, there mho besides an optional distant control mic available with programmable button functions. angstrom well as respective scanning modes, the receiver besides had a ocular read where the display would show a bar-graph of signal levels at ±5 channel steps away from the tune signal. If you were listening to the A VFO ( amateur bands ) this besides didn thymine interrupt the receiver audio, as it uses the B VFO liquidator for the searching. With all these memories to play with, you can clone the contents to and from your personal computer with a desirable interface lead, there s even freelydownloadable Windows software for this available on the Kenwood web site. YAESU FT-60R The most holocene entrant to the four, having just become available, is the Yaesu FT-60 dual-band hand-held. With a 1400mAh 7.2V Metal-Hydride battery pack and a ruffianly polycarbonate outside, this is a chunkier hand-held than the Icom or Kenwood models and is the heaviest of the four ; my first depression when holding it was that it s built to last. The top fascia bulk and squelch controls are both analogue traffic circle types, with an inner click-step synchronous converter knob for frequency and duct variety. With its 1000 memory channels the information can be cloned between radios but not to a personal computer, although usefully the memory channels besides store your selected impart power level american samoa well as the other usual parameters. On each of the five memory bands there s besides a quick-access home channel memory, for you to store your favorite frequency on each. arsenic well as usual memory and VFO scanning, a smart search will search above and below your tune frequency, automatically storing active frequencies into memory for you. A possibly handy facility is an optional PIN Code on switch-on, where you need to enter a four-digit phone number before you can have entree to the radio s functions. The entirely manner to override this is to perform an all reset on switch-on, which clears all the memories from prying eyes. For habit in solid sign areas as an alternate to the common noise squelch circuit, an RF level squelch can be used, where only signals above a given S-meter read will raise the put-down. There s besides a selectable TX Battery saver where the transmitter will switch to a lower impart power level when received signals are at a high gear level, to make your barrage last that sting longer. Yaesu has besides thought approximately emergency operation, as by pressing and holding the 4 key for a second, the radio receiver will mechanically go to your dwelling UHF channel, the radio receiver randomness computer keyboard and LCD will flash with an alarm clock note reasoned from the speaker, and if you press the PTT on the radio you can interrupt the alarm temporarily to transmit on your UHF channel. An hand brake automatic ID can besides be used by another post transmitting a CTCSS tone pair to place your radio into either intermittent or continuous impart mode, it ll evening transmit your pre-stored callsign in Morse for you every 10 minutes. other Yaesu-specific functions in the radio include their auto-range transponder organization which lets you know if another opposite radio receiver goes out of roll, and the automatic infection of a given DTMF tone on each PTT for the Vertex Standard wide coverage internet repeater enhancement system. Although the radio can easily be 21 22 REVIEW used with many of these bells and whistles, I found it extremely easy to use on-air even without reading the instruction book the automatic rifle recidivist chemise and simpleton controls besides found prefer with one or two other amateurs who had a blend with the hand-held. I found it was very immune to close-in 12.5kHz space signals, even though the receive bandwidth stayed unaltered between narrow and broad impart deviation settings. CONCLUSIONS The deliberate lab test results are shown in the accompanying postpone. These have been measured using the normal RadCom VHF / UHF test methods ( see late review issues for details ), but the important point to note is that all have been measured in precisely the like way so that direct performance comparisons can be made. In examining the technical results and using the handhelds on air out, I must say that, hand-on-heart, there s no open winner. Each radio has its own strengths, and different users will naturally have different needs and preferences. The dear technical foul performance and fair price of the Yaesu is based on a hand sized radio, whereas the engage versatility, ultra-wide receive coverage and small size however long battery life of the Icom and Kenwood handhelds come at a higher price. Budget-minded users will credibly be swayed by the more economic Alinco, which offers good performance and ease of use together with some unique bells and whistles of its own. conversely, none of the handhelds came out looking ill, for case by having a high price rag ( or even a low price tag ) but with hapless technical or on-air operation. therefore, ladies and gentlemen, in conclusion, I declare the four-way shoot-out rival … a draw ! Our thanks go to Nevada, Icom ( UK ), Kenwood Electronics ( UK ), and Yaesu ( UK ), for the loanword of the radios, and specially for all of these gladly agreeing for this rival to take place ! DJ-596 DJ-596 IC-E90 IC-E90 IC-E90 TH-F7E TH-F7E FT-60R FT-60R 145MHz 433MHz 51MHz 145MHz 433MHz 145MHz 433MHz 145MHz 433MHz RECEIVER Sensitivity ( µv palladium ) Squelch Level Min ( µv palladium ) Squelch Level Min ( dubnium SINAD ) Squelch Level Max ( µv palladium ) Squelch Level Max ( decibel SINAD ) Adjacent Chan Rejection +12.5kHz ( +10kHz 6m ) ( dubnium ) 51.5/ / Adjacent Chan Rejection -12.5kHz ( -10kHz 6m ) ( decibel ) 49.4/ / Adjacent Chan Rejection +25kHz ( +20kHz 6m ) ( decibel ) Adjacent Chan Rejection -25kHz ( -20kHz 6m ) ( dubnium ) Blocking Rejection 100kHz spacing ( decibel ) Blocking Rejection 1MHz spacing ( dubnium ) Blocking Rejection 10MHz space ( dubnium ) Intermodulation Rejection 25kHz space ( decibel ) Intermodulation Rejection 50kHz spacing ( decibel ) Image Rejection 1st IF ( decibel ) Bl. Lim. Bl. Lim Image Rejection 2nd IF ( decibel ) Bl. Lim. Bl. Lim Bl. Lim > Image Rejection _ 1st IF ( dubnium ) Bl. Lim Bl. Lim Maximum Audio Output ( mw ) S Meter Level 1st indication ( µv palladium ) Sq Open Sq Open Sq Open S Meter Level 1st indication ( proportional Level decibel ) 0 decibel referee 0 decibel referee n/a n/a n/a 0 dubnium referee 0 dubnium referee 0 decibel referee 0 decibel referee S Meter Level 2nd indication ( µv palladium ) S Meter Level 2nd reading ( relative Level decibel ) dubnium referee. 0 decibel referee. 0 dubnium referee S Meter Level 3rd indication ( µv palladium ) S Meter Level 3rd indication ( proportional Level dubnium ) S Meter Level 4th indication ( µv palladium ) S Meter Level 4th indication ( relative Level decibel ) S Meter Level 5th reading ( µv palladium ) S Meter Level 5th indication ( proportional Level dubnium ) S Meter Level 6th indication ( µv palladium ) n/a n/a S Meter Level 6th indication ( relative Level decibel ) n/a n/a S Meter Level 7th Indication ( µv palladium ) n/a n/a n/a n/a n/a n/a n/a S Meter Level 7th Indication ( Relative Level dubnium ) n/a n/a n/a n/a n/a n/a n/a S Meter Level 8th Indication ( µv palladium ) n/a n/a n/a n/a n/a n/a n/a S Meter Level 8th Indication ( Relative Level decibel ) n/a n/a n/a n/a n/a n/a n/a TRANSMITTER Power High ( W ) Power Mid ( W ) n/a n/a n/a n/a n/a n/a Power Low ( W ) Deviation 25kHz impart space ( kilohertz ) diversion 12.5kHz channel space ( kilohertz ) Hz deviation 25kHz channel spacing ( kilohertz ) Hz deviation 12.5kHz transmit space ( kilohertz ) nd harmonic level ( dbc ) < < rd harmonic flush ( dbc ) < -80 < -80 < -80 < th harmonic degree ( dbc ) < < -80 < -80 < -80 < < -80 5th consonant level ( dbc ) < -80 < -80 < -80 < -80 < -80 < -80 < -80 < -80 < -80 6th consonant grade ( dbc ) < -80 - < -80 < -80 - < -80 - < -80-7th harmonic level ( dbc ) < -80 - < -80 < -80 - < -80 - < December 2004 RadCom 
23 By Steve Hartley, G0FUW DOWN TO EARTH 5 Sydenham Buildings, Lower Bristol Road, Bath BA2 3BS. Newcomers news Steve Hartley answers some license questions and looks at the use of convert CB rig for 10m. father and son Ashley and Andrew Elias, and Mark Dean, three more foundation successes for the Llanelli ARS. Thanks to club instructors, Roy, GW0KJZ ; Ken, MW0CEE, and Ken, GW0RNK. T he definition of the term the Station in the October Newcomers news column prompted some questions from John, G0MXN. He asked where this interpretation was documented. One position to look is on page 19 of the Foundation Licence now ! textbook. John besides asked for clearing on the return of Maritime Mobile operation, particularly with deference to the Norfolk Broads, some of which are tidal. As I understand it, the dividing wrinkle between Mobile mathematical process on an Inland Waterway and Maritime Mobile in tidal waters is blissfully obscure. The lone time I can see an Ofcom examiner getting excessively excited about such matters is where a Station is causing undue hindrance ( EMC problems ) and as most vessels move around the Broads, this seems improbable. The final charge raised was the old chestnut about when Mobile operation stops and process from a Temporary localization begins. The Licence states that a Temporary Location means a placement, other than the Main Station Address, in the UK and in a sterilize position and that Mobile means located in the UK in any vehicle, as a pedestrian or on any Vessel in Inland Waters. Again, there is no clear divide and definitions relating to the power provide ( mains or battery ) and time spent stationary are nothing more than urban myths. As I see it, if you park your cable car on some high ground for a long distance contact you are still Mobile ( in a fomite ) but if you parked your car in the lapp target for an eight-hour contest, then I would say you were at a irregular Location ( a fixed side ). Please note that Static Mobile and Pedestrian Portable are not terms you will find anywhere in the Licence and Stations using them are technically in rupture of their license ! OFFSHORE NETS ? Paul Clark, M3FPC, wrote a little while ago to ask if I knew of any amateurish radio receiver nets operating between offshore platforms. Paul has interested in amateurish radio since RadCom December 2004 around 1974 : My forefather was in the Royal Signals in the 1950s and I can well recall the ( AR88 ? ) receivers in a bank across one wall being utilised in Egypt and Libya at this time. When I got the listen microbe at 15 or therefore I borrowed an Eddystone EC10 Mk2 which I thought was reasonably amazing. I late bought a Yaesu FRG-7 and this performed very well. Over the next number of years I had plenty of time to indulge in all sorts of overseas audio adventures. I recall hearing an antarctic base where the operator spent over half an hour in QSO with no pile-ups and no outside hindrance ! I besides recall a chap in the Azores sounding pretty worried as the weather was deteriorating. The following sidereal day it was on newsworthiness reports that the islands had suffered a mini crack and the church on the main island had been badly damaged. I constantly wondered what happened to that crevice ! Paul gained his M3 callsign last September and is enjoying being on the impart side of things. He had some problems finding a Foundation course but ended up at the Beacons at Frodsham in Cheshire and says the weekend course was very good. Paul now attends the St Leonard sulfur ARS in Stafford, which he describes as a smashing group egged on with loads of enthusiasm by the chair Derek Southey, G0EYX. He goes on, I ve developed an interest in working remote control islands around Britain – delighted to work St Kilda the other day – but I m besides concerned in offshore oil platforms. I wonder if you are mindful of any regular net income that may be undertaken in the North Sea or off our coast involving anoint rigs or platforms ? Well, readers, anyone got any data for Paul ? CONVERTING CB RIGS FOR 28MHz A subject cropped up on the QRP Club group a few weeks back that I thought newcomers might be concern in. The interrogate asked related to the conversion of CB radios for use on the 28MHz amateur band. This is seen by many as a bum and effective way of getting on the air WEB SEARCH Foundation Licence now ! : Chelmsford ARS ( licensing train ) : but there have been problems over the legality of owning 27MHz SSB CBs that can not be licensed in this country. Doug Raynes of Ofcom provided the be statement : The Radiocommunications Agency ( RA ) had a scheme many years ago giving the opportunity for amateurish license holders to apply for an authority to possess unapproved CB equipment converted ( or to be converted ) to amateur bands. This was a concession to enable amateurs to legally possess such equipment and the RA ceased issuing these authorities in There was never any restriction on amateurs converting approved CB equipment. so if the dress was primitively a legal CB plant, there is no restriction on sale and monomania. I think that sets the commemorate square but I must remind readers that the Foundation license does not permit operation on 28MHz, you need to have an Intermediate or a full license to take advantage of this. train SLIDESHOWS The Chelmsford Amateur Radio Society is making available PowerPoint slides for the Advanced course. They can be downloaded from the Training page on the CARS web site. Slides for the Foundation and Intermediate courses are besides available. For promote data about amateur radio courses in Chelmsford contact Clive Ward, M0SIX, tel : or FURTHER READING Foundation Licence now ! by Alan Betts, G0HIQ. all-important learn for all electric potential radio amateur. available from the RSGB Shop for 3.39 ( members price : non-members 3.99 ) 
24 DOWN TO EARTH Ian Poole, G3YWX 5 Meadway, Staines, Middx TW18 2PW. Why HF radio waves travel around the globe In the first of a bipartite series on HF generation, Ian Poole takes a look at why radio waves are affected by the upper reaches of the atmosphere. S ignal propagation using the ionosphere is the key to long-distance communications on the HF bands. As a resultant role, a effective work cognition of the concepts is substantive for anyone wanting to make the most of the equipment they are using on these bands. experience DXers always have a beneficial understand of the different modes of generation, and they are able to make the most of them knowing what times and frequencies to use and what to expect. A good cognition of generation can make the difference between achieving ordinary or average results and making those interesting contacts with rare DX stations all around the earth. Before looking at the effects of propagation, it is first base necessity to take a look at the standard atmosphere and the ionosphere to understand more about the areas where these effects occur. THE ATMOSPHERE The air can be divided into a number of areas according to the different properties of each area. There are naturally a phone number of ways this can be done, but the most normally use categories are those used by meteorologists, where changes in the temperature gradient define the boundaries for the different regions ( see Fig 1 ). Closest to the earth second surface, extending to an altitude of around 10km is the troposphere. Above this at altitudes between 10 and 50km we find the stratosphere, which contains the celebrated ozone layer at a altitude of around 20km. Above the stratosphere is the mesosphere, extending from an elevation of 50 to 80km, and above this the thermosphere, where temperatures can reach anything up to 1200º Celsius. For VHF and UHF communications the troposphere has an important effect on radio conditions. however, for MF and HF band communications, it is the ionosphere that is the most crucial. The ionosphere is a region that crosses over the boundaries of the meteorologic layers and extends from around 60 up to 700km. THE IONOSPHERE The ionosphere receives its name because it is a region in the atmosphere where ions exist. Normally it might be expected that the molecules Fig 1 Fig 2 Fig 3 Fig 4 Fig 5 Fig 1 : Regions of the standard atmosphere. Fig 2 : typical electron distribution at day and night. Fig 3 : Simplified view of the layers of the ionosphere over the period of a day. Fig 4 : The consequence of increasing frequency on the deflection of radio signals in the ionosphere. Fig 5 : multiple reflections. would exist as molecules. In fact the very high temperatures and low pressures mean that the gases exist in a monatomic form and they are known as neutrals. In fact at altitudes greater than about 150km, most of the gases exist in this form. radiation from the sunday ( chiefly ultra-violet light ) is sufficiently strong that when it strikes the gasoline molecules and neutrals, they split or ionise, to form an electron which is negatively charged and a positive ion ( ie a atom or achromatic which is short-change of an electron ). Although it is the ions that give their name to the region it is the spare electrons that actually affect the radio waves. Look at Fig 2. The count of electrons starts to rise at an elevation of around 30km. however, it is not until an altitude of approximately 60km is reached that the level rises sufficiently to have a significant effect on radio receiver signals. In 24 December 2004 RadCom 25 DOWN TO EARTH fact at higher altitudes ( specially above about 150km ) the horizontal surface of ionization rises importantly even though the natural gas density is much lower and there are less molecules or neutrals to ionise. The argue for this is that that the neutrals are much easier to ionise than molecules. It is much considered that the ionosphere consists of a number of clear-cut layers. While this is convenient for many explanations, it is not accurate. There is ionization in the whole of the ionosphere, but there are regions where there are peaks in the tied of ionization. These peaks are credibly more correctly termed regions than layers, as there is no notice change between one and the following. however, in order to refer to these different regions, they are given designations, namely D, E and F ( there is actually besides a C area, but the level of ionization is thus low that it has no effect on radio receiver waves ). THE D REGION Fig 3 shows a simplify view of the layers of the ionosphere over the menstruation of 24 hours. The D region is the lowest of the ionospheric regions that affect radio signals. It exists at altitudes between about 60 and 90km – but only during the sidereal day when radiation is received from the sun. Because the concentration of the air is relatively high at this altitude, the ions and electrons recombine relatively cursorily and after black – when no radiation is received – the electron levels fall quickly and the region effectively disappears. This region attenuates MF and HF signals that pass through it, the attenuation being inversely proportional to the feather of the frequency, i doubling the frequency reduces the horizontal surface of attenuation by a factor of four. The level of attenuation is sufficiently high that that MF signals ( eg medium wave and 1.8MHz or topband ) are prevented from reaching the higher layers, except at night when the D region disappears. The reason that the D region attenuates signals is that the signal travel by through it causes the exempt electrons to vibrate. As the electrons vibrate they collide with the gas molecules. At each collision a small measure of energy is lost and this results in a decrease in the level of the bespeak. The come of power lost, ie the attenuation, is proportional to the number of collisions, and in turn this is dependent upon a act of factors. One of the most obvious is the number of gas molecules that are present. The greater the issue of gas molecules, the higher the number of collisions and therefore the higher the attenuation. The degree of ionization is besides very important. The third gear chief component is the frequency of the RadCom December 2004 signal. As the frequency increases, the wavelength of the shaking shortens, and the number of collisions between the barren electrons and natural gas molecules decreases. As a result signals lower in the frequency spectrum are attenuated far more than those which are higher in frequency. even so, high frequency signals still suffer some reduction in signal military capability. THE E AND F REGIONS Above the D region, two further ionize regions exist. The lower of these is the E region that is found at an altitude of between 100 and 125km. As the electrons and ions inactive recombine relatively quickly here, there is a big decrease in the degree of ionization after sunset. This means that the E region about disappears at night although there is hush a remainder flush of ionization. Above the E region is found the most important region for long-haul communications and it is known as the F region. During the day it often splits into two, the F1 and F2 regions, and at night they normally merge. The altitude of these regions varies well dependent upon a variety of factors including the meter of day, season and the express of the solar cycle. In summer, the F1 layer may be at around 300km with the F2 layer at about 400km or even higher. In winter these figures may be reduced to about 200km and 300km. then at night the F layer is broadly about 250 to 300km. But as these figures vary well they should alone be taken as a very roughly guide. In the lapp way that the tied of ionization of the D and E layers falls at nox, so it does for the F layer. however, the rate at which recombination takes place is much slower because the layer is higher and the air concentration is less. This means that the ionization remains over night and it however affects radio signals. The E and F regions act in a unlike way to the D region. Signals entering these regions again cause the electrons to vibrate, but quite than causing the signal to be attenuated, the headman consequence is that the sign is refracted. As the signal travels into the area and sees an increasing electron density it is refracted away from the area of higher electron concentration. In the case of HF signals, this refraction is much sufficient to bend them back to land. In effect it appears that the layer has reflected the bespeak, and often people talk about reflections caused by the ionosphere. The degree of refraction is dependent upon the frequency and the slant of incidence. As the frequency increases, it is found that the WEB SEARCH amount of deflection decreases until a frequency is reached where the signals pass through the layer and on to the next. finally a point is reached where the signal passes through all the layers and on into outer space, as shown in Fig 4. HOPS, REFLECTIONS AND LOSSES It is possible to reach considerable distances when using the ionosphere to refract or reflect radio signals. Using simple geometry it is potential to calculate that the utmost distance that can be achieved is around 2000km for the E region and 4000km for the F region. This does not explain how signals can travel over much greater distances, and even reach the other side of the earth, though. This results from the sign undergo several reflections. Having returned to land from the ionosphere, the earth s open acts a reflecting telescope and returns the signal bet on up to the ionosphere where it is again reflected back to worldly concern, as shown in Fig 5. In this way a signal can travel right around the world. When signals are refracted by the ionosphere there is a count of losses that must be taken into report. The D region attenuates signals each time they pass through it. For a single hop the sign will pass through it twice, and four times for a double hop. This is one of the major losses incurred, but fortunately it falls quickly with increasing frequency. This is why signals on the 28MHz dance band can be very much stronger than, for example, those on 14MHz when both bands are assailable. Loss is besides incurred when the signal is reflected by the land randomness surface. The ocean, or boggy and wet areas are the best, and dry arid areas such as dessert or urban areas are the worst and reflecting signals. Accordingly it is best to choose frequencies that are probably to provide signal paths with the minimum act of hops. This normally entails using higher frequencies, provided that that ring is receptive for communications via the ionosphere. farther read Further information on this subject can be gained from the RSGB book Radio Propagation Principles and Practice by Ian Poole. It is available from the RSGB Shop at ( members price : non-members 14.99 ). Radio Propagation Principles and Practice : Ian Poole mho radio receiver and electronics website : Ian Poole mho business web site : 25 
26 Q u a l one t y I n nitrogen o DR-135E Full Featured 50W 144MHz Mobile now now down 67 texas : MHz 50/10/5 Watts power settings 100 memory channels Frequency Steps : 5, 8.33, 10, 12.5, 15, 20, 25, 30, 50kHz Front panel GPS stimulation for APRS Rear panel DSUB9 computer connection Ignition key on/off have CTCSS and DCS encode + decode Super-wide 7 character display Wide/narrow ( 25/12 1 2kHz ) FM modes Theft alarm feature Ten car dial memories Size : 142 x 40 ten 174mm EJ-41U Optional inner TNC operates 1200, 9600bps EJ-40U Optional Digital Voice Board ALINCO DX-70TH Fully Featured Portable HF+6mtr Transceiver 10W-100W SWITCHABLE The DX-70TH packs a hefty 100W punch on all Ham bands MHz. It is backed by a brilliant receiver with narrow filters fitted as criterion. Make no mistake – this is a veridical DX operators transceiver ideal for use at home, or for that portable DXpedition. now down 100 TX – all HF + 6mtr 100W output signal on HF & 6mtrs RX – general coverage 150kHz – 30-MHz, 50MHz – 54MHz SSB, CW, AM, FM and digital modes 100 memories detachable faceplate and remote mounting kit available Speech central processing unit standard Narrow filters fitted as criterion EDX-2 Auto Tuner An automatic pistol antenna radio receiver that matches a transceiver to a random wire antenna of over 3m in distance ( 3.5MHz and above ), or over 12m in length ( 1.6MHz and above ). It comes installed with 5m of coaxial and restraint cables for instant operation with Alinco DX-70. Auto tuner 3.5MHz-30MHz ( with over 3 meter component ) 200W PEP baron handling Power for tuning = 7-20W 13.8V DC ±10 % operating electric potential W-100W SWITCHABLE now down W HF transceiver General coverage RX 500kHz – 30MHz All modes, FM, LSB, USB, CW & AM 100 memory channels Built in speech compressor Front mounted speaker, brassy clear sound recording Optional cardinal HFM-1 A stainless steel, heavy duty HF mobile antenna complete with form base. Covers 3.5 to 30MHz when used with the Alinco EDX-2 Automatic Tuner. alternatively it may be base matched with any type of tuner for infectious mononucleosis band or multi band use. Power handling with the EDX-2 is 150W. ALINCO DX-77E HF Transceiver GREAT VALUE The DX-77 is a blueprint accomplishment that puts a HF desktop transceiver within your reach ! And this is no bare bones radio, nor is it a converted transmit adaptation. The DX-77 was designed from the begin to be a quality Amateur Radio, full of features to enhance its performance and your enjoyment Covers : distance : megahertz when used with EDX-2 car ATU ) 2.7 metres VISIT OUR WEBSITE – SEE THE FULL RANGE ! besides available from our dealers in the UK or steer 
27 _ vanadium a metric ton one o nitrogen S thyroxine y fifty e unbeatable Value ! DJ-193E GREAT VALUE 2 mtr Handheld 2m ( MHz ) Up to 5W VHF Wide RX potential ( typical MHz ) CTCSS + DCS enc/dec fitted 40 memory channels 1 call channel alphanumeric display DCS, Tone outburst and DTMF 13.8V DC lead stimulation facility with battery charge sport THEFT ALARM ! Emits a tone when disconnected from world power S Meter Audio dialler Call cloning facility Computer programmable 3rd party software Experimental worm rebarbative have ! DJ-195E 2 mtr Handheld with Keypad New 2 meter ( MHz ) handheld Easy to use, address introduction keypad Wide RX possible ( typical MHz ) Up to 5 Watts output ( 0.8W low might ) 40 memory channels + 1 call transmit Large range of accessories available now down 40 immediately down DJ-X2000 Intelligent Scanning Receiver Covers 100kHz – 2,149.99MHz 2000 channel memory AM/NFM/WFM/LSB/USB/CW Flashtune reads the frequency of a nearby vector and immediately takes your liquidator to it Record up to 160 secs direct from receiver or via the built in mic Descrambler Channel setting Bug detector CTCSS decoder/search Frequency counter Field intensity meter S Meter PC programmable Includes FREE : Multi voltage 110V-240VAC Mains Charger for easy consumption anywhere in the worldly concern 4.8VDC 700mAH NiCad battery pack Belt clip Carrying strap Flexible low profile antenna DJ-X10E Advanced Scanning Receiver now down 100 Receives : 100kHz MHz Multi mode reception AM – WFM – NFM – SSB – CW 1200 memory channels Channel telescope spectrum analyser – allows monitoring of 40 channels Advanced scanning features : Programmed scan ( up to 10 groups ) Programmed memory scan – Any memory scan – mode scan – VFO search down – double VFO search – Band encursion scan 50 – precedence read – Any channel ship scan Battery save facility Facilities for cloning another set Built-in 24 hour clock Switchable attenuator now DJ-C7E Dual Band Transceiver Air Band Receiver Scanner FM Radio The dual-band transceiver, airband receiver, scanner and FM radio fits comfortably in your shirt scoop ! Giving brilliant dualband operation in a handy package, this radio barely feels right from the moment you beginning hold it. 2m FM, 70cm FM Broadcast FM receive Optional extended RX coverage : Airband : MHz ( iraqi national congress raw 8.33kHz steps ) VHF : MHz UHF : MHz FM and AM : on all carry frequencies Frequency steps : 5/6.25/8.33/10/12.5/15/20/25/30/50/100/125/200KHz world power out : 300mW ( battery ) 500mW ( 6V DC ) 200 memories Modes : VFO / Memory / Scan Full CTCSS encode and decode Four unlike tone bursts for european operation SMA antenna socket, rubber duck antenna supplied Size : 56 x 96 ten 14.5 millimeter only 102g including battery and antenna Supplied Accessories Lithium-ion Battery Pack EBP-58N ( 3.7V 600mAh ) Mains ( V ) Fast Charger Helical Antenna Antenna Cap NEW Optional Accessories EMS speaker microphone EME earphone microphone EME earphone EBP-58N Li-Ion battery clique EDC battery charger EDH cigarette lighter cable ESC balmy case DJ-596 E Dual Bander 100 memory channels, any mix of VHF/UHF Alphanumeric channel labels Direct freq input signal from keypad Large backlit display CTCSS, DCS encode + decode DTMF tones and autodial memories Tone bursts Three scan modes Theft Alarm feature Wide and narrow FM TX/RX 12VDC direct stimulation ( 5W output ) High-power NiMH battery ( 4.5w output signal VHF/4w UHF ) Busy Channel Lock Out Mosquito Repelling feature ( experimental ) External Terminal Control Wire cloning capability Optional digital mode ( where permitted ) now down DJ-X3 Ultra Modern Scanning Receiver 100kHz MHz AM/FM/WFM 700 memory channels Steps : 5/6.5/8.33/10/12.5/ 15/20/25/ 30/50/100kHz Auto descrambler Bug detector Stereo FM ( with headphones ) Attenuator SMA Antenna Battery rescuer cct size : 56w x 102h ten 23d millimeter Weight : 14.5g ( without batteries ) Supplied c/w : 3 AA dry cell battery case, carrying strap Optional extras Ni-Mh battery gang Drop in Hob mains charger Earphone with 8.33kHz for airband DJ-V5E Compact Dual Bander New double dance band handy transceiver 5W/1W/0.5W end product exponent Super wide welcome ( 76-999MHz ) Includes wide FM mode CTCSS Encode+decode, DTMF squelch and 4 different european tone Bursts 200 memory channels + 2 call channels Alphanumeric Display, up to 6 characters Autodial memories Up to 6 character alpha-tagging 4 scan modes, 5 programmable scan banks Input electric potential display with over electric potential warning Automatic high temperature auspices feature now down VISIT : order HOTLINE : whole 1 Fitzherbert Spur Farlington Portsmouth PO6 1TT fax : nevada UK Distributors of Alinco Products 
28 OLSON IS THE MARKET LEADER FOR HIGH QUALITY MAINS DISTRIBUTION PANELS POWER FOR THE OFFICE A WIDE RANGE OF PRODUCTS AVAILABLE WITH RCD, MCB AND RF FILTER PROTECTION INTERNATIONAL RANGE For 19 rackmounting systems, designed for vertical or horizontal use. available with european, American, australian and IEC sockets. POWER FOR 19 RACKMOUNT SYSTEMS FLOOR BOXES INDUSTRIAL WITH RCD PROTECTION DATA PATCH PANELS 19 CABLE TIDIES 19 VENTILATION PANELS 32 AMP MULTI-POWER CABLE MANAGEMENT SYSTEMS 19 FAN TRAYS NEW CATALOGUE ! SALESLINE ELECTRONICS LIMITED 24 HOUR DELIVERY SERVICE VISA, MASTERCARD & SWITCH CARDS ACCEPTED OLSON HOUSE, 490 HONEYPOT LANE STANMORE, MIDDLESEX HA7 1JX TEL : facsimile : web site : 
29 NEWS FEATURE ML & S Open Day An open Day is being held at the fresh ML & S storehouse in Chertsey, Surrey on 4 December. We preview what you will find there. Martin attends to a customer. he well-known amateur radio receiver dealers Martin Lynch & Sons Thave moved from Ealing, West London, and opened a much larger storehouse, devoted entirely to amateur radio, in Chertsey, Surrey. The store opened back in August and Martin is nowadays holding a super-sale open day at the new premises on 4 December. Representatives of Yaesu, Kenwood and Icom will be there to show off their latest products, together with the RSGB, PW Publishing, RAIBC and other golf club stalls. But that s not all : Martin and the Lynch mob have organised a cable car boot sale in the rise car ballpark, along with a hog knock, sponsored by Yaesu, Kenwood and Icom. The cable car boot sale is operated on a first come, first served footing, thus if you want to sell any second-hand equipment – deoxyadenosine monophosphate well as look at all the latest new gearing – you d better get there early ! One of the great advantages of the modern premises over the previous localization is the ease of parking. immediately outside the shop is a private car park which, combined with the back yard, allows free customer parking for up to 70 cars. There are besides several public carparks within walking distance. The new air-cool store measures a massive 3000 sq foot, with an extra 1000 sq foot area upstairs that is then far unused. In the showroom, row upon course of gleaming new equipment is available for use. There are three give areas for Yaesu, Kenwood and Icom, plus extra racks featuring other manufacturers such as Linear Amp UK, MyDEL, Miracle Products, MFJ, Diamond, SGC, bhi and many others. The roof of the build is immediately festooned with aerials for all the HF bands, VHF and UHF, so you can try out any of the transceivers in a real life on-the-air situation. new PRODUCTS In addition to the familiar and notso-familiar equipment from the manufacturers listed above, Martin is announcing at least three new significant product lines at the open day. For years, Barenco have appeared at all the major rallies selling their extensive image of antenna hardware. For the first clock you can now buy Barenco products over the counter in the ML & S showroom. Tigertronics ( are best known for their excellent Signalink Sound card interface, for which ML & S have sponsored the master software since day one. The full scope is now available from banal, including the identical popular SL- 1 Signalink. ultimately, New Communications Solutions ( NCS – are a new US manufacturer producing identical high gear timbre multi-switcher fishing gear controllers allowing operators with more than one rig in their reside to use merely one microphone, cardinal and TNC. The Martin Lynch & Sons Open Day takes invest between 9.30am and 5.00pm on Saturday 4 December at ML & S, Outline House, 73 Guildford Street, Chertsey, Surrey KT16 9AS. entrance is free. The store is located just over a mile from junction 11 of the M25. alternatively, exit at articulation 13 ( Staines passing ) and follow the signs to Thorpe Park then Chertsey town center. By coach, Chertsey railroad track station is an 800-yard walk along Guildford Street. For more details see or call Part of the showroom. Since this photograph was taken, the postpone has been replaced with purpose-built displays for the boastful three manufacturers. Antennas R us ? Customers make their choice. RadCom December 30 Please mention RadCom when replying to advertisements MLP32 TX & RX MHz one prey, S.W.R. 2:1 and below over wholly frequency rate professional quality ( length 1420mm ) MLP62 same specification as MLP32 but with increase freq. crop Length 2000mm AM-PRO 6 metric ton ( Length 4.6 approx ) AM-PRO 10 metric ton ( Length 7 approx ) AM-PRO 17 machine translation ( Length 7 approx ) AM-PRO 20 meitnerium ( Length 7 approx ) AM-PRO 40 machine translation ( Length 7 approx ) AM-PRO 80 meitnerium ( Length 7 approx ) AM-PRO 160 montana ( Length 7 approx ) AM-PRO MB5 Multi band 10/15/20/40/80 can use 4 Bands at one meter ( Length 100 ” ) SPX-100 plug nitrogen go multiband 6/10/12/15/17/20/30/40/80mtrs. Band changing is easy via a flylead and socket and adjustable telescopic worst section 1.65m when in full extended SJ MHz slimline design with SO239 association. Length 1.00m SJ MHz slimline design with SO239 connection. Length 2.00m SQ & BM Range VX 6Co -linear : – specially Designed Tubular Vertical Coils individually tuned to within 0.05pf ( maximum ability 100 watt ) BM100 Dual-Bander ( 2 montana 3dBd ) ( 70cms 6dBd ) ( Length 39 ) SQBM100 Dual-Bander ( 2 meitnerium 3dBd ) ( 70cms 6dBd ) ( Length 39 ) BM200 Dual-Bander ( 2 montana 4.5dBd ) ( 70cms 7.5dBd ) ( Length 62 ) SQBM200 Dual-Bander ( 2 metric ton 4.5dBd ) ( 70cms 7.5dBd ) ( Length 62 ) SQBM500 Dual – Bander Super Gainer ( 2 machine translation 6.8dBd ) ( 70cms 9.2dBd ) ( Length100 ) BM1000 Tri-Bander ( 2 meitnerium 6.2dBd ) ( 6 montana 3.0dBd ) ( 70cms 8.4dBd ) ( Length 100 ) SQBM1000 Tri-Bander ( 2 meitnerium 6.2dBd ) ( 6 montana 3.0dBd ) ( 70cms 8.4dBd ) ( Length 100 ) SQBM 100/200/500/800/1000 are Polycoated Fibre Glass with Chrome & Stainless Steel Fittings. BM33 70 curium 2 ten 5 8 roll Length 39 ” 7.0 dbd Gain BM45 70cm 3 adam 5 8 wave Length 62 ” 8.5 dbd Gain BM55 70cm 4 ten 5 8 beckon Length 100 ” 10 dbd Gain BM60 2mtr5 8 Wave, Length 62 ”, 5.5dBd Gain BM65 2mtr 2 ten 5 8 Wave, Length 100 ”, 8.0 dbd Gain metre 5 Element ( Boom 64 ) ( Gain 7.5dBd ) meter 8 Element ( Boom 126 ) ( Gain 11.5dBd ) curium 13 Element ( Boom 83 ) ( Gain 12.5dBd ) meter 4 Element ( Boom 48 ) ( Gain 7dBd ) meter 5 Element ( Boom 63 ) ( Gain 10dBd ) meter 8 Element ( Boom 125 ) ( Gain 12dBd ) meter 11 Element ( Boom 185 ) ( Gain 13dBd ) meter 3 Element ( Boom 45 ) ( Gain 8dBd ) meter 5 Element ( Boom 128 ) ( Gain 10dBd ) meter 3 Element ( Boom 72 ) ( Gain 7.5dBd ) meter 5 Element ( Boom 142 ) ( Gain 9.5dBd ) curium 13 Element ( Boom 76 ) ( Gain 12.5dBd ) MICRO MAG Dual band 2/70 antenna complete with 1 ” charismatic mountain 5mtrs of miniskirt wheedle terminated in BNC MR700 2m/70cms, 1/4 wave & 5/8, Gain 2m 0dB/3.0dB 70cms length 20 ” 3 8 Fitting SO239 Fitting MR Metre 70 centimeter 2.8 & 4.8 dbd Gain ( 5 8 & 2×5 8 brandish ) ( Length 60 ” ) ( 3 8 fitting ) ( SO239 fitting ) MRQ525 2m/70cms, 1/4 brandish & 5/8, Gain 2m 0.5dB/3.2dB 70cms length 17 ” SO239 fitting commercial quality MRQ500 2m/70cms, 1/2 wave & 2×5/8, Gain 2m 3.2dB/5.8db 70cms duration 38 ” SO239 fitting commercial choice MRQ750 2m/70cms, 6/8 wave & 3×5/8, Gain 2m 5.5dB/8.0dB 70cms length 60 ” SO239 fitting commercial quality MRQ800 6/2/70cms 1/4 6/8 & 3 adam 5/8, Gain 6m3.0dBi/2m 5.0dB/70 7.5dB length 60 ” SO239 fitting commercial quality GF151 Professional glass climb double set antenna. Freq : 2/70 acquire : 2.9/4.3dB. distance : 31 ” … New low price MR meter straight stainless 1 4 wave 3 8 fit SO239 type MR Metre 5 8 wave 3.2 dbd Gain ( 3 8 match ) ( Length 58 ” ) MR 268S 2 Metre 5 8 wave 3.5dBd reach Length 51 ” S0239 fitting MR Metre ( 2 ten 5/8 profit : 7.0dBd ) ( Length : 100 ” ). SO239 fitting, the best it gets MR Metre infrastructure loaded ( 1/4 wave ) ( Length : 50 ” ) commercial quality MR Metre loaded 1 4 wave ( Length 56 ” ) ( 3 8 fit ) MR Metre loaded 1 4 wave ( Length 40 ” ) ( 3 8 adjustment ) ( SO239 fitting ) curium 1 /2 wave ( Length 26 ) ( addition : 2.5dB ) ( Radial spare ) metre 1 /2 wave ( Length 52 ) ( Gain 2.5dB ) ( Radial loose ) metre 1 /2 wave ( Length 80 ) ( Gain 2.5dB ) ( Radial loose ) metre 1 /2 wave ( Length 120 ) ( Gain 2.5dB ) ( Radial rid ) metre 5 /8 wave ( Length 150 ) ( Gain 4.5dB ) ( 3 adam 28 ” radials ) MFJ-941E MFJ MFJ MFJ-949E MFJ MFJ MFJ MFJ MFJ-974H RDP-3B 10/15/20mtrs length 7.40m RDP-4 12/17/30mtrs length 10.50m RDP-40M 40mtrs length 11.20m RDP-6B 10/12/15/17/20/30mtrs boom length 1.00m DLHF /15/20mtrs ( 12/17-30m ) Boom length 4.2m. Max height 6.8m. Weight 35kg. Gain 10dB MRW-310 Rubber DuckTX 2 Metre & 70 centimeter Super Gainer RX Length 40cm BNC fitting MRW-232 Mini Miracle TX 2 Metre 70 & 23 centimeter RX Mhz Length precisely 4.5cm BNC fitting MRW-250 Telescopic TX 2 Metre & 70 centimeter RX Mhz Length 14-41cm BNC fitting MRW-200 Flexi TX 2 Metre & 70cms RX Mhz Length 21cm SMA fitting MRW-210 Flexi TX 2 Metre & 70cms Super Gainer RX Mhz Length 37cm SMA meet centimeter ( Boom 12 ) meter ( Boom 20 ) meter ( Boom 23 ) meter ( Boom 33 ) meter ( Boom 52 ) /2/70 Triband ( Boom 45 ) meter 5 Element ( Boom 38 ) ( Gain 9.5dBd ) meter 7 Element ( Boom 60 ) ( Gain 12dBd ) meter 12 Element ( Boom 126 ) ( Gain 14dBd ) centimeter 7 Element ( Boom 28 ) ( Gain 11.5dBd ) curium 12 Element ( Boom 48 ) ( Gain 14dBd ) The biggest advantage with a ZL-special is that you get massive acquire for such a belittled boom length, making it our most democratic beam antenna MSS-1 Freq RX Mhz, TX 2 mtr 2.5 dbd Gain, TX 70cms 4.0 dbd Gain, Length 39 ” MSS-2 Freq RX Mhz, TX 2 mtr 4.0 dbd Gain, TX 70cms 6.0 dbd Gain, Length 62 ” IVX-2000 Freq RX Mhz, TX 6 mtr 2.0 dbd Gain, 2 mtr 4dBd Gain, 70cms 6dBd Gain, Length 100 ” Above antennas are desirable for transceivers merely HALF … FULL Standard ( enamelled ) Hard Drawn ( pre-stretched ) Flex Weave ( original high quality ) Flexweave PVC ( clearly coated PVC ) Deluxe 450 ohm PVC Special TS1 Stainless Steel Tension Springs ( copulate ) for G5RV Convert your half size g5rv into a full size with just 8ft either english. ideal for the little garden GRP “ OD Length : 2.0m grade : 3mm GRP “ OD Length : 2.0m grade : 3mm GRP “ OD Length : 2.0m mark : 3mm MD020 20mt version approx only 11ft MD040 40mt version approx lone 11ft MDO80 80mt version approx only 11ft ( slimline lightweight aluminum construction ) 2 meter ( size 12 approx ) meter ( size 20 approx ) meter ( size 30 approx ) These identical democratic antennas square folded di-pole type antennas MGR-3 3mm ( maximum load 250 kilogram ) MGR-4 4mm ( utmost load 380 kilogram ) MGR-6 6mm ( maximum lode 620 kilogram ) 31 Please mention RadCom when replying to advertisements 6 ” Stand Off Bracket ( complete with U Bolts ) “ Stand off bracket ( complete with U Bolts ) “ Stand off bracket ( complete with U Bolts ) “ T & K Bracket ( complete with U Bolts ) “ T & K Bracket ( dispatch with U Bolts ) “ T & K Bracket ( complete with U Bolts ) “ T & K Bracket ( complete with U Bolts ) Chimney lashing kit out Double lamp chimney lashing kit Way Pole Spider for Guy Rope/ wire Way Pole Spider for Guy Rope/wire “ Mast Sleeve/Joiner “ Mast Sleeve/Joiner “ Mast Sleeve/Joiner “ Mast Sleeve/Joiner Earth rod including clamp ( copper plated ) earth rod including clamp ( solid copper ) Pole to pole clamp 2 ” -2 ” Di-pole center ( for wire ) Di-pole center ( for aluminum perch ) Dog bone insulator Dog bone insulator heavy duty Heavy Duty Aluminium ( 1.8mm wall ) with a lovely push-fit finnish to give a very impregnable mast set 1 1 /4 ” one 5 ‘ ali pole /4 ” set of four ( 20 ‘ total approx ) /2 ” single 5 ‘ ali pole /2 ” set of four ( 20 ‘ full approx ) /4 ” individual 5 ‘ ali perch /4 ” set of four ( 20 ‘ total approx ) “ individual 5 ‘ ali pole “ set of four ( 20 ‘ total approx ) RG58 best quality standard per montana … 35p RG58 best quality military specification per machine translation … 60p RGMini 8 best quality military specification per montana … 70p RG213 best timbre military specification per montana … 85p H100 best quality military wheedle cable per machine translation core rotator cable television per montana … 45p 7-core rotator cable per montana ampere red/black cable television 10 ampere per montana … 40p 20 ampere red/black cable 20 adenosine monophosphate per machine translation … 75p 30 adenosine monophosphate red/black cable television 30 ampere per meitnerium Please call for particular 100 meter discounted price PL259/9 chew ( Large submission ) PL259 Reducer ( For PL259/6 to conv to P1259/6 ) PL259/6 plug ( Small submission ) PL259/7 plug ( For mini 8 cable ) BNC Screw character plug ( Small entry ) BNC Solder type ballyhoo ( Small submission ) BNC Solder type plug ( Large entry ) N-Type hack ( Small entry ) N-Type plug ( Large entry ) SO239 Chassis socket ( Round ) SO239 Chassis socket ( Square ) N-Type Chassis scoket ( Round ) N-Type Chassis scoket ( Square ) SO239 Double female arranger PL259 Double male arranger N-Type Double female SO239 to BNC adapter SO239 to N-Type adapter SO239 to PL259 adapter ( Right slant ) SO239 T-Piece adapter ( 2xPL 1XSO ) N-Type to PL259 adapter ( Female to male ) BNC to PL259 arranger ( Female to male ) BNC to N-Type adapter ( Female to male ) BNC to N-Type adapter ( Male to female ) SMA to BNC adapter ( Male to female ) SMA to SO239 adapter ( Male to SO239 ) SO239 to 3/8 adapter ( For antenna ) /8 whip stud ( For 2.5mm whips ) Please add just 2.00 P & P for connection only orders PLEASE PHONE FOR LARGE CONNECTOR ORDER DISCOUNTS MB-1 1:1 Balun 400 watts power MB-4 4:1 Balun 400 watt power MB-6 6:1 Balun 400 watt power MB-1X 1:1 Balun 1000 watts world power MB-4X 4:1 Balun 1000 watt world power MB-6X 6:1 Balun 1000 watt baron MB-Y2 Yagi Balun 1.5 to 50MHz 1kW MD-24 HF or VHF/UHF internal duplex ( MHz ) ( MHz ) SO239/PL259 fittings MD-24N same specification as MD-24 but N-type fittings MX2000 HF/VHF/UHF internal Tri-plexer ( 1.6-60MHz ) ( MHz ) ( MHz ) CS201 Two-way di-cast antenna switch. Freq : MHz max 2,500 watts SO239 fittings CS201-N Same specification as CS201 but with N-type fittings CS401 Same specification as CS201 but4-way AR Very light duty TV/UHF AR-300XL Light duty UHF\VHF YS-130 Medium duty VHF RC5-1 Heavy duty HF RG5-3 Heavy Duty HF iraqi national congress pre set control box AR26 Alignment Bearing for the AR300XL RC26 Alignment Bearing for RC5-1/ Turbo magazine climb 7 4mtrs coax/pl or SO Tri-mag mount 3 x 5 4mtrs coax/pl or SO Hatch Back Mount ( stainless sword ) 4 montana coax/pl259 3 /8 or SO239 in full adjustable with turn knob Gutter Mount ( same as above ) Rail Mount ( aluminum ) 4mtrs coax/pl259 sutiable for up to linch roof bars or poles 3 /8 fitting SO259 fitting Gutter Mount ( cast aluminum ) 4mtrs coax/pl259 3 /8 fitting SO259 fitting Hatch Back Mount 3 /8 4mtrs coax/pl Roof stud Mount 4mts coax/pl259 3 /8 or SO239 fitting Enamelled bull wire 16 gauge ( 50mtrs ) Hard Drawn copper wire 16 gauge ( 50mtrs ) Equipment wire Multi Stranded ( 50mtrs ) Flexweave high timbre ( 50mtrs ) PVC Coated Flexweave high timbre ( 50mtrs ) Ω Ladder Ribbon heavy duty USA imported ( 20mtrs ) Ω Ladder Ribbon big duty USA imported ( 20mtrs ) ( early lengths available, please phone for details ) BAHF-4 FREQ : Mtrs LENGTH : 1.70m height : 1.20m might : 300 Watts CDX Lightening arrestor 500 watt MDX Lightening arrestor 1000 watts AKD TV1 trickle Amalgamating videotape ( 10mtrs ) Desoldering pump Alignment 5pc kit TMA-1 Aluminium mast 4 sections 170cm each 45mm to 30mm Approx 20ft erect 6ft collapsed TMA-2 Aluminium mast 8 sections 170cm each 65mm to 30mm Approx 40ft erect 6ft collapsed TMF-1 Fibreglass mast 4 sections 160cm each 50mm to 30mm Approx 20ft erect 6ft collapsed TMF-2 Fibreglass mast 5 sections 240cm each 60mm to 30mm Approx 40ft tumid 9ft collapsed HBV-2 2 BAND 2 ELEMENT TRAPPED BEAM FREQ:20-40 Mtrs GAIN:4dBd BOOM:5.00m LONGEST ELEMENT:13.00m POWER:1600 Watts ADEX BAND 3 ELEMENT TRAPPED BEAM FREQ : Mtrs GAIN:8 dbd BOOM:4.42m LONGEST ELE:8.46m POWER:2000 Watts ADEX BAND 4 ELEMENT TRAPPED BEAM FREQ : Mtrs GAIN:7.5 dbd BOOM:4.27m LONGEST ELE:10.00m POWER:2000 Watts Mtr RADIAL KIT FOR ABOVE VR BAND VERTICAL FREQ : Mtrs GAIN : 3.5dBi stature : 3.80m exponent : 2000 Watts ( without radials ) power : 500 Watts ( with optional radials ) OPTIONAL mtr radial kit VR BAND VERTICAL FREQ : Mtrs GAIN : 3.5dBi altitude : 4.00m RADIAL LENGTH : 2.30m ( included ). baron : 500 Watts EVX BAND VERTICAL FREQ : Mtrs GAIN : 3.5dBi height : 6.50m exponent : 2000 Watts ( without radials ) power : 500 Watts ( with optional radials ) OPTIONAL mtr radial kit OPTIONAL 40mtr radial kit EVX BAND VERTICAL FREQ : Mtrs GAIN : 3.5dBi acme : 7.30m ability : 2000 Watts ( without radials ) baron : 500 Watts ( with optional radials ) OPTIONAL mtr radial kit OPTIONAL 40mtr radial kit out OPTIONAL 80mtr radial kit EVX BAND VERTICAL FREQ : Mtrs GAIN : 3.5dBi acme : 5.00m RADIAL LENGTH : 1.70m ( included ) might : 800 Watts EVX BAND VERTICAL FREQ : Mtrs ( 80m optional ) gain : 3.5dBi stature : 4.90m RADIAL LENGTH : 1.80m ( included ) baron : 2000 Watts MTR RADIAL KIT FOR ABOVE ( All verticals require grounding if optional radials are not purchased to obtain a good VSWR ) UTD160 FREQ:160 Mtrs LENGTH:28m POWER:1000 Watts MTD-1 ( 3 BAND ) FREQ : Mtrs LENGTH:7.40 Mtrs POWER:1000 Watts MTD-2 ( 2 BAND ) FREQ:40-80 Mtrs LENGTH : 20Mtrs POWER:1000 Watts MTD-3 ( 3 BAND ) FREQ : Mtrs LENGTH : 32.5m might : 1000 Watts MTD-4 ( 3 BAND ) FREQ : Mtrs LENGTH : 10.5m power : 1000 Watts MTD-5 ( 5 BAND ) FREQ : Mtrs LENGTH : 20m POWER:1000 Watts ( MTD-5 is a intersect di-pole with 4 legs ) STANDARD LEADS 1mtr RG58 PL259 to PL259 lead mtr RG58 PL259 to PL259 jumper cable mtr RG58 PL259 to PL259 precede MILITARY SPECIFICATION LEADS 1mtr RG58 Mil spec PL259 to PL259 conduct mtr RG58 Mil spec PL259 to PL259 lead mtr RG58 Mil spec PL259 to PL259 contribute mtr RG213 Mil spec PL259 to PL259 jumper cable mtr RG213 Mil spec PL259 to PL259 lead mtr RG213 Mil spec PL259 to PL259 lead ( All other leads and lengths available, internet explorer. BNC to N-type, etc. Please earphone for details ) ALL PICTURES ARE FOR REFERENCE ONLY 
32 Field Head Leconfield Road, Leconfield, Beverley, E. Yorkshire, England HU17 7LU Phone / Fax web BALANCED SUPERTUNER +44 ( 0 ) The new Balanced Supertuner has been designed for utmost efficiency and optimum Q on each ring. It w ill handle any amplifier with an output of up to 1500W RMS CW. The newfangled ATU is up to 3dB more efficient than a conventional tuner using a 4:1 balun. The Supertuner, though intended for balance tip line, can besides tune a farseeing wire and coaxial cable. You can feed an LF aerial on the m terminals and feed an HF aerial on the 10 20m terminals and experience the ease of tuning with this modern ATU and the accelerate that you can change bands. Without SWR/power meter 345 With SWR/power meter 395 RANGER 811H Britains best selling belittled amplifier gives 800W on all bands m using 4 x 811A valves. The Ranger uses many components which are rated far greater than its modest O/P. Price 945 RANGER 811K Do you fancy building your own amplifier without having to tramp around flea-markets looking for parts ? The RANGER is immediately available in kit shape everything you need in one box. Price 695 UK Importers and stockist of Ecoflex Coaxial Cables and Connectors Aircell 7 This 7mm diameter extremist flexible coaxial cable is your surrogate for RG213/UR67 With a double filmdom, personnel casualty is actually lower at VHF & UHF than RG213/UR67 Ecoflex 10 This 10.3mm diameter wheedle is the coaxial cable to use if you want a good all round low personnel casualty performance from HF to UHF. ULTRAFLEXIBLE and highly durable due to the thwart having a fictile back to make it about indistructable by normal bending or flexing this includes the loops on rotator cages and on crank-up towers. Ecoflex 15 This ½Inch ( 15mm ) diameter coaxial cable is the best extremist FLEXIBLE coaxial cable. This cable television is so flexible it evening goes around the ROTATOR cage on the loom like RG213 ! ! ! No kidding with a better passing trope than that of FSJ4-50 and airless to that of LDF4-50 Shouldn thyroxine you make Ecoflex 15 your following cable choice For more infomation and prices on the Ecoflex Range, and other radio items go to the Diode Communications web site liaison us via – or Tel/Fax : Copyright Diode Communications 2004 
33 Pat Hawker, G3VA TECHNICAL TOPICS 37 Dovercourt Road, Dulwich, London SE22 8SS. TT G3VA takes a look at short doublets, and discusses the effects of ground on inverted-vs. He besides considers the use of ATUs, both in balanced and unbalance phase. curtly DOUBLETS, INVERTED-Vs & GROUND LOSSES The July TT item Short-Span HF Antennas & the C-Pole Vertical, has brought comments from David Reynolds, G3ZPF, Dave Gordon- Smith, G3UUR, and Norman Bonnett, DL6NEE/G0NNA. DL6NEE/G0NNA believes there is an indefensible assumption that the doublet antenna is used chiefly as an electrically-short cable or LF antenna. He writes : I have used a doublet for many years as a traffic circle antenna on the HF bands, and cut as a 14MHz half-wave dipole. The antenna has a metallic perch element centre-fed with 450Ω open-wire feeder. This is fed via a limited G5RV tuner. The chemical element comprises aluminum tube of 1mm wall-thickness, easily obtained here in Germany from local anesthetic builders supermarkets. This antenna has the advantage that it covers all HF bands from 14 to 28MHz without the implicit in losses ( 2-3dB ) of traps, providing a modest profit compared with a dipole on bands above 14MHz. It can besides be used as a top-loaded vertical with some directivity on 10MHz and 7MHz. [ It could presumably besides be used with some personnel casualty of efficiency as an electrically-short doublet on 10MHz and even 7MHz G3VA ]. I use this as my normal flat band antenna for my hebdomadally /P trips to the local hills. With its simple construction, the antenna can be erected in 45 minutes. In adverse weather it can be lowered within three minutes and packed away in a further 20. rotation is with the un-patented Arm-strong organization. It works, has given me 3B9C on four bands, including a QRP contact. It is childlike to construct and works first time plug and play in commit. G3ZPF reports using an 84ft top in an inverted-v multi-band doublet antenna with an vertex merely 25ft gamey : Yet I managed 5-band DXCC on it … I m not saying it was easy, beware. The stature ( not the length ) was the big problem on 3.5MHz. The feed-lines were about 18ft long. I was lucky enough to have the hovel in an upstairs room immediately below the gable end of the house. After having settled on an 84ft crown. I subsequently saw references to antennas of alike length for all-band use, therefore possibly 84ft is some kind of magic length alternatively, it may merely be a convenient distance for average gardens A straddle of 84ft can be used successfully on 1.8MHz as G3UUR testifies : I think you may be interest in the results of my experiments on short doublets over the past four decades. On and off, I ve been using multi-band doublets with legs vitamin a brusque as 42ft on 160m. I ve moved around a bit in that clock and sometimes a multi-band doublet has not been the most commodious antenna for me to use, but it is surely my preferable antenna. The leg length of 42ft performs very well on 80m, since it is about two-thirds of a fullsize half-wave dipole but, on 160m, it is about the shortest length I would want to use for reasonable results. The operation you get from such a short doublet on 160m practical execution of G3IPV s QRP ATU shown in Fig 3. depends greatly on the stature of the antenna and the insulator changeless and conduction of the grate beneath it. Lowering the ends of a short horizontal doublet to form an inverted-v doublet badly degrades the operation on 160m. My observations are that this can degrade the performance by 6dB or more, if the ends are lowered from about 30ft to 6ft, but this is very much subject on the parameters of the labor beneath it. When the original work on inverted-v antenna was done by american amateurs, the stature of the ends of their antenna was well greater than what we typically use as the center height in this nation. They wouldn t have noticed the increased insulator passing that we get from having the voltage point sol conclude to ground. On 80m, where the voltage at the ends is not so great, because the antenna is longer in terms of a half-wavelength, I think the loss is only about 3dB or then. Most amateur don triiodothyronine understand that horizontal antennas induce indeed much loss in the grind when they are relatively broken. It s not good antennas fed against labor that suffer from anchor loss. The horizontal section of an inverted-l can have significant induced ground loss if it is depleted in terms of the wavelength in use. just count at the feed electric resistance of a horizontal half-wave dipole over very crunch, and you can get a find for the sort of losses that can be induced in the horizontal elements of inverted-v antennas. Mind you, it might take a spot of digging in the lit- RadCom December 34 TECHNICAL TOPICS FIG 1 RADCOM 293 Radiation Resistance ( 0hms ) FIG 2 * Requires allowance to match individual Installations 50Ω Input Horizontal λ 2 Tap 8t * 13 turn elementary Vertical λ Height Of Antenna Centre In Wavelength 15µH Core 2 x FX1589 stacked. Primary wound over whole core ( Tunes vertical independently of dipole modality ) 5 turns* 22µH erature to find figures for a dipole over real number earth, preferably than a perfectly conducting one ! Why the handbook editors insist on including graph of dipole feed electric resistance over perfective reason preferably than the boundlessly more useful plot over very ground, I just don thymine know. They ve had the experimental plat of the real number situation since the former 1930s, and a paper in Wireless Engineer by Sommerfeld, about 1942, gave a theoretical discussion of the subject, which produced a like plat for respective ground conditions. I must confess that I have not so far traced the Sommerfeld plat and Fig 1 from Fundamentals of SSB ( Collins, 3rd edition, 1960 ) shows only the variation in radiation resistance of a theoretical half-wave dipole with acme above a perfectly conducting grind. The text adds that for a virtual half-wave dipole over actual earth, the variations will be lower. The chart shows the steep decline in radiation resistance at D D V G V G S1A S1B Fig 1 Variation of the radiation resistance of a theoretical half-wave dipole with altitude above a perfectly-conducting land. Fig 2 Simple ATU used by G3UUR to match a short doublet on 160m in balanced dipole-mode with open-wire feeders or as a vertically-polarised T- antenna with flog feeders. RADCOM 294 V Vertical manner D Dipole mode G Ground To feeder heights below about 0.2λ, and the estimate magnitude of the changes to be expected even at heights of about one-wavelength. The radiotherapy resistance of the theoretical, free-space, half-wave dipole is 73Ω while that of a virtual halfwave dipole in free space is of the order of 65 to 70Ω, ascribable to the resonant distance of the actual dipole being slightly less than a half-wave. Despite the limitations of Fig 1, it does indicate that the centre-impedance of a low antenna is unlikely to provide a actually full equal to either 50Ω or 75Ω coaxial cable. That is why it will normally be advisable to use some shape of ATU if you are determined to present a oneness match to the output socket of your transceiver. But remember that, unless there is an unusually-long wheedle feeder, the extra world power loss due to a minor VSWR will normally be insignificant ; the main problem these days is that solid-state transceivers automatically reduce world power output when presented with a VSWR of more than approximately 1:1.5 or 1:2. G3UUR continues : With citation to the multi-band short doublet used on 1.8MHz, readers may be interested to know about the ground-wave operation of such horizontal antennas. The interaction between the horizontal doublet and ground through the near-zone electric sphere gives raise to a ground-wave and low-angle vertically-polarised radiation that has maximum persuasiveness off the ends of the doublet, and minimum broadside to it. The lastingness of this ground-wave depends on the height of the doublet, the ground parameters, and the length of each leg relative to a quarter-wave. The shorter the leg duration, the greater the force of the establish wave, since the electric field at the ends increases for shorter lengths at any given altitude. As to be expected, the higher the doublet, the weaker the grind wave becomes, and the more effective the antenna becomes for high-angle sky-wave. Half-wave dipoles besides produce a ground-wave and vertically-polarised low-angle radiation when they are humble in altitude ; this decreases in military capability as the dipole height is increased. An facility I used for about five years was a doublet with 48ft per branch, about 45ft high at the center and 9ft gamey at either end. I would have preferred to put the ends higher, but one leg came polish into a small front garden where it would have been impossible to erect a improbable pole to support the end. I did try raising the end that came depressed in the little back garden, and this gave the antenna matter to and useful directional properties. however, I could not make practice of this directivity because the make noise pick-up with the two legs balanced was so a lot reduced that I was forced to opt for the poise configuration with both ends broken. The two doublet and feeder legs were made from the like length of 14SWG wire, so there were no joints that needed protection from the upwind. From the measurements I made, it had a center tip electric resistance of 35 j950ω, which transformed to 7 j194ω at the bottom of a 55ft long, 500Ω feeder. I estimated that this antenna was about 5 to 7 % effective on 160m, but it gave a very good score of itself, and I worked 34 December 2004 RadCom 35 TECHNICAL TOPICS around the world with modest exponent on this band. I could have increased the operation by about 3dB if I had loaded the branch for resonance on 160m, but the performance on 80m would have been impair and I wasn triiodothyronine will to make that sacrifice. Interestingly enough, when it rained and both the ground conduction and insulator changeless went up, the insubordinate part of the feed electric resistance increased, indicating worsening background loss. This confirms the prevailing consequence of the near-field-induced insulator loss ( the improvement in prime conduction due to increase moisture content would have reduced the magneticallyinduced background personnel casualty ). For local ground-wave communication, I used to short the feeders together and tune the antenna against ground to avoid the effects of the two groundwave nulls tirade to the line of the doublet when feed in the balance mode. I had had reports from mobiles driving through these broadside nulls that they were in excess of 40dB deep ! Incidentally, I always used the low-angle vertically-polarised radiation launched along with the ground-wave from the doublet interacting with the grind, when it was at the right guidance for DX, in predilection to the strapped-feeder erect radiation. This was because my ground system was never good enough and my bird feeder was excessively close to the house wall not to incur good loss from the wet bricks in the winter. The feed arrangement on 160m was extremely childlike. It consisted of a broad-band toroidal transformer matching from 50Ω polish to 7Ω, with a series variable inductor to one leg of the 7Ω output of the transformer to cancel the reactance of the feed decimal point electric resistance. This gave me simplicity, and the public toilet of the broadest possible operating bandwidth of any match network for this sort of electric resistance. For the strapped-feeder mode, I have a tap on the primary coil wind of the broadband transformer at 21Ω. I ve been using this agreement since the early on 1980s, and there is very nothing to compare with it. much as I love large balance ATUs, I equitable can t justify using one these days, except for show or RadCom December 2004 nostalgia ! The 160m ATU arrangement and antenna connections are shown in Fig 2. For the HF bands, I have a W1JR-type balun to isolate the wheedle remark and give a balanced 50Ω. then a single-ended ATU with an autotransformer matching the resistive part of the antenna electric resistance ( anything from 12.5Ω to 450Ω ) with a serial inductor and capacitor to tune out the reactance. This elementary arrangement matches a wide variety show of antennas with a abject loaded-q and good libra. Anything I can t match with this apparatus can be made to match by lengthening, or shorten, the feeder slightly. however, to-date I haven t had to resort to any self-feeder snip. G3UUR has besides commented concisely on the C-Pole upright ( TT July 2004 ) giving the reasons why this configuration would have no advantage over a ground-based quarter-wave vertical. He is doubtful about accepting without experimental confirmation just what EZNEC says about flat coat losses. He would not trust flush the latest professional adaptation of NEC ( NEC-4D ) which, for little air loops over average ground, shows following to no induce ground passing, yet the experimental results show an extra 10dB compared with the conductor loss. BALANCED ATUs The growing popularity of multiband doublet antenna on HF has brought about a revival of the use of twin-wire balanced feeders brought all the way to the manoeuver position or, alternatively, to a distant ATU positioned immediately below the center of the radiating element as shown in Fig 2 of the July TT. While G3UUR shows above one versatile form of ATU using a toroid balun, it is obtrusive that a number of firms have recently introduced newfangled high-octane ATUs capable of being used with either balanced or unbalance feeders. A Product Review in QST, September 2004, provides information on A New Generation of Balanced Antenna Tuners including the MFJ-974H, the Palstar AT15000BAL and AT4K. All three of these high-power units use a different architecture, each different from their legitimate ancestor, the Johnson Matchbox. All ATUs that are intended to match into a across-the-board rate of insubordinate and reactive electric resistance, over the wide HF spectrum, depend for efficiency ( internet explorer minimum world power loss ) on the function of high-q components variable over a wide image of induction and capacitance. traditionally for ATUs, inductors may be varied by the use of circuit board coils, tapped coils, or roller-coasters. Capacitors may require to have a identical depleted minimum capacitor ( with a high RF voltage rat ) and a very big maximum capacitor, a difficult and costly specification. In practice, most ATUs, commercial or home-built, involve compromises to reduce the cost. power losses in ATUs providing balanced output may besides be introduced by the balanced-to-unbalanced transformers ( baluns ). At high-octane, significant losses show up angstrom inflame, but at low-power this can pass unnoticed. saturation of ferrite cores or the consumption of low-q components can be a trouble at high-octane. Pig-tail or leap connections to the synchronous converter plates of a variable capacitor required to pass high RF current can lose might. Jack Belrose, VE2CV, in On the Quest for an Ideal Antenna Tuner ( QST, October 2004, pp35 38 with an Appendix on p39 dealing with the G5RV antenna ) discusses the design of optimum antenna tuners for feeding antennas through balanced lines. He clears up some common misconceptions, taking as his footing, the normally used high-pass t-network and the calculator analyses presented by N6BV and W8ZR in the twentieth edition of The ARRL Antenna Book. In his basic remarks, VE2CV points out that, at one clock, it was park practice to use link coupling between the might amplifier tank coil and an external resonate circumference, thus providing a balance output. The change to transmitters required to feed into 50Ω unbalanced ( coaxial ) line has led to the use of some imprint of balun, either where the wheedle feeder connects to a balanced antenna component, or between the ATU and the coaxial cable bird feeder, or between the transmitter and the ATU. VE2CV comments : If open-wire transmission line is used, the balun is normally placed between the ATU and the balanced line, where the VSWR can be high. This stresses the 35 36 TECHNICAL TOPICS Fig 3 Simple, reversible L-matching network as discussed by VE2CV ( QST ). typical respect for the variable inductor, L, is 30mH maximum. C is a dual-section pF-per-section arranged so that it can operate as a single-section or with the two sections in parallel indeed as to keep the minimal capacitor vitamin a low as possible, see Fig 4. Fig 4 VE2CV s L-matching network as a versatile adaptation of the network shown in Fig 3 and basically the same except that the component agreement can be changed. ( QST, October 2004 ). Fig 5 Circuit diagram of G3IPV s multi-purpose L/C ATU using a large survival of circuit board coils and claimed as being able to match any antenna in the range 1.8 to 144MHz. Built as a QRP unit in a case 8in by 5in by 3in. C is a vane-type capacitor selected for VHF ( 15pF soap ) or 250pF max isolated from chassis. L requires diverse values to resonate C and external circuitry to operating frequency with oneness VSWR. For higher powers, a roller-coaster inductor and high-voltage capacitor could be used. From ant C Tuning control L FIG 3 Unbalanced 50Ω Input FIG 5 RADCOM 297 IA To tcvr IB 50Ω Coaxial cable I3 Balun ( see text ) FIG 4 Ferrite beads In S3 3 S2 S I1 I2 Balanced 50Ω output Jumper electrify L A S1 In B C A L 2 B C 2 1 RADCOM RADCOM 296 S2 Out Jumper cable S2 Out balun and could lead to balun bankruptcy. In accession, power loss can be considerable. For cosmopolitan applications it seems advisable to use an ATU that provides a balance output in such a way that it can promptly be converted to unbalance end product by means of a jumper connecting one english of the balanced output to earth. In his preferable plan ( Fig 3 ), VE2CV substitutes a reversible L- equal net for the commonly-used t-network, requiring entirely a individual high-octane variable capacitor. This proficiency was noted in TT, May 1993 in connection with PA0SE south multiband Comudipole HF Antenna ( see besides Antenna Topics, pp303-5 [ and this calendar month s Antennas column on p48 Ed. ] ) which besides discusses the use of duplicate coaxial lines to form balance 100Ω or 150Ω balance line. The 1:1 W2DU-type current balun, comprising ferrite beads over the wheedle is an integral partially of the line connecting the radio receiver to the vector. VE2CV writes : For many years, I have been making the case that the best method acting to feed a multiband dipole is to use a poise transmittance wrinkle having the necessary length to reach from the antenna element terminals to the transceiver, not as Louis Varney, G5RV, did. [ That is with a assign duration of open-wire bird feeder connected to a centre-fed element with a final random length of coaxial cable to the vector ]. He provides a case study, using an EZNEC PRO program, of a 98ft 9in ( 30.1m ) dipole at a stature of 40ft, with a eater comprising 40ft of 450Ω windowed twin lead above average ground. He shows the dipole electric resistance, stimulation electric resistance of antenna system, network values and transmission line loss ( tuner personnel casualty ) for all the HF bands from 3.75 to 29MHz. The network values for these frequencies are shown to range from 9.9µH, 413.6pF at 3.75MHz to 0.2µH, 75.1pF at 29.0MHz although the values at average bands are not consecutive. Tuner loss is greatest at 21.5MHz ( 0.24dB ) with a complete transmittance line loss of 0.41dB. All these net values can be readily achieved with the component values shown for Fig 3 provided that the dual-section pF varying capacitor is arranged sol that it can be operated as a single-section, or with the two sections in parallel. With the dim-witted placement shown in Fig 3, there will be some impedances with other doublet spans etc for which the tuner will not provide a adept couple. The difficulty can normally be overcome by interchanging L and C but, for optimum performance, the throw of the network as shown in Fig 4 is suggested by VE2CV. This permits trade choice of the wax rate of versatility available with the L-network. One further modification could permit the use of a lower-cost splitstator or ganged capacitor, provided that the spike is not earthed to the radio receiver enclosure. If the two sections are connected in series, the minimum capacitance is halved and the RF voltage evaluation doubled, at the cost of halving the maximum capacitor of a single-section ( one-fourth the maximum capacitor of the two sections in latitude ). SIMPLE UNBALANCED LC ATU Peter Haylett, G3IPV, has been using and experimenting with a fresh human body of two-component LC ATU that appears to couple any antenna at any frequency and, when adjusted for the dance band in doubt, is able of presenting a one VSWR to the vector : Fig 5. His prototype unit was originally built as an experimental means of coupling a lowpower VHF transceiver to a long wire antenna while reducing breakthrough from adjacent channels. however, over the years he has used it, with diverse HF and VHF transceivers, he has always found it possible to achieve one VSWR once the chastise L/C ratio for the frequency in use has been found. G3IPV has a big banal of coils constructed on HC6Y crystal-holder bases and finds it easy to find the decline L/C ratio on any band. He reports that a grating adaptation can be found by peaking the receiver make noise level. clearly, the unit as shown in his photograph would be unsuitable for use at high gear world power due to the impregnation and attendant heat ( baron loss ) of the toroid-core coil and close-spaced capacitor. I did carry out a simple experiment using a roller-coaster coil and sanely high-voltage capacitor with a 100W HF vector feeding a dummy load in the form of a domestic light light bulb. The series connection of the L/C network seemed effective although it would need a more sophisticated test to check whether such an ATU would, with desirable components, meet in drill the claim of matching any antenna at any frequency and without incurring undue ability losses. 36 December 2004 RadCom 
37 alone plus phosphorus & phosphorus Callseeker Plus 2005 Callseeker Plus is the democratic CD version of the RSGB Yearbook with a potent “ Eurocall ” callsign search facility. not only does this four hundred contains the complete contents of the RSGB 2005 Yearbook there is much more. The Eurocall search facility provides the ideal program for quickly searching for all or depart of a callsign, zip code, appoint, town, keyword etc. You are besides not limited to UK callsigns as the database besides includes callsigns from 9A, DL, EA, EI, ES, F, HA, HB9, I, LX, LY, OE, OH, ON, OZ, SM, SP, SV and Z3. All the information pages of the Yearbook are included in PDF format. This means that by using the Adobe Acrobat Reader included you can see on shield or via your printer every page precisely as it appears in the print Yearbook plus p & phosphorus Non Members Price RSGB Yearbook 2005 UK & Ireland Call Book Edited by Steve White, G3ZVW If you want a complete tilt of all of the UK licences on offspring combined with a 176 pages of invaluable data about amateur radio receiver the 2005 RSGB Yearbook is for you. Bigger than ever the 2005 RSGB Yearbook has had every page reviewed and updated from the 2004 edition. The contents reflect the stream state of the hobby, with pages devoted to contesting, awards, satellites and propagation. New for this edition are the ‘Contesting Guide ‘, your complete scout to RSGB contests from HF to microwave. You will besides find features on Top Band Direction Finding and Mills Weekend. The section devoted to licensing now contains a huge list of all the Foundation, Intermediate and Advanced amateur radio courses available, plus a tilt of Examination Centres. IOTA receives extensive coverage, with a feature on IOTA ‘s fortieth Anniversary, information on the awards outline, the Honour Roll and Annual Listing. additionally there is the callsign number for the Irish Republic, for short wave listeners and short contest callsigns, plus surname and zip code listings. As you would expect there is besides much, much more include. All-in-all it adds up to a reference book that no radio amateur should be without. Everything you need at your fingertips, with 476 A4 pages this book is excellent value plus phosphorus & phosphorus Non Members Price only plus phosphorus & phosphorus RSGB SHOP RSGB Lambda House Cranborne Road Potters Bar Herts. EN6 3JE Tel Fax ORDER 24 HOURS A DAY ON OUR WEBSITE RSGB Radio Amateur World Call Book For the first base meter you can get up to date UK call information on a certificate of deposit with World Call data Members Non Members IOTA Directory – 40th Anniversary Edition 40 years of the IOTA are celebrated in the essential guide to participating in the broadcast. 136 pages, size 297 adam 210mm ISBN Members 9.99 Non Members World Prefix Map Map of the World Printed in boldface colours 38 ” ( 98cm ) across and is in a 1 : 42,000,000 scale. fully updated in 2002 and includes East Timor ( 4W ) and the Ducie Islands ( VP6/D ) Members 4.99 Non Members RadCom Archive sets especial multi-year archive sets of Radcom and its predecessor the Bulletin, with sets available prior to Members Non Members RadCom 2003 Single year archive of the RSGB monthly 100-page magazine RadCom in Members Non Members ARRL DXCC List This version includes a complete list of DX Century Club rules including the latest changes and clarifications Members 3.99 Non Members All prices plus phosphorus & phosphorus 
38 EMC David Lauder, G0SNO 20 Sutherland Close, Barnet, EN5 2JL. EMC T he Radiocommunications Agency ( RA ) had an across-the-board program of technical research in radio communications and EMC. Some of this work was done by external companies and universities while other work was done internally by the RA Radio Technology and Compatibility Group ( RTCG ) lab at Whyteleafe, Surrey. Details of RA and RTCG research projects and reports can be found in the Legacy Regulator Archive section of the Ofcom web site ( see Web Search ). Ofcom has decided to subcontract all internal technical research to a single contractor and was due to announce the successful bidder for this work at the end of October The RTCG lab at Whyteleafe, Surrey are to close and the locate is to be sold off. All staff at RTCG, including those in technical foul calculate, have received redundancy notices and no staff have been re-deployed within Ofcom. closely all staff within the external inquiry and contract management section at Ofcom HQ have been similarly affected. Although Ofcom plans to continue research activities through an external contractor, it seems a feel for that experience staff are being made pleonastic and that indeed much expertness is being lost, not lone in research but besides in the area of EMC standards. enforce EMC REGULATIONS The UK EMC Regulations, Statutory Instrument ( SI ) 1992 No. 2372, were the UK response to european Commission EMC Directive 89/336/EEC. These regulations came into force on 1 January 1996, and there can be heavy fines for breaching the UK EMC Regulations, for exercise Section 85 of the EMC Regulations, which relates to falsely affixing a CE marker. Offences under certain early sections of the UK EMC Regulations carry a punishment of captivity for up to three months. It appears that the UK is the alone area in Europe where a jail conviction is possible under these regulations. Nevertheless, enforcement of the EMC Regulations does not appear to be particularly rigorous in the UK at the moment. EMC in the June 2001 RadCom included information on a merchandise that used mains-borne communication on two frequencies in the HF range. Although the frequencies were away amateur bands, the EMC Committee was concerned that this could set a precedent for the use of Ofcom closes the RA EMC Labs G0SNO reports on this event. He besides discusses the problems involved in enforcing some of the EMC regulations. Some useful data is then given about EMC problems associated with Ethernet LANs. Left Winding a DC baron cable eight turns through a clip-on ferrite core with a 13mm diameter hole. Right Winding a calculator net cable 10 turns through a ferrite ring with a 23mm diameter trap. HF mains-borne communication in buildings. I sent a imitate of my test report to the London Borough of Barnet trade Standards department. I stated that although precompliance EMC quiz equipment was used and the test results may not be identical to those obtained by a license EMC screen lab, it appeared that the intersection produced designed conduct emissions good in excess of the existing mains conducted emission limits. As it was CE marked, it was likely that the Technical Construction File ( TCF ) route to EMC conformity had been used. I pointed out that a TCF would need to include a justification for permitting the designed lead emissions and I questioned the cogency of any such TCF. As trade Standards departments are enforcement Authorities as defined by Section 73 of the EMC Regulations, I called upon them to investigate this matter. I understand that the count was referred to Kent trade Standards and that a like product was besides tested by the RA RTCG lab ( Projects 499 and 501 ) but these reports are not available on-line. I never received a reply to my letter to London Borough of Barnet however. end year, another EMC Committee member, John, G8MM, noticed that a shop in Hertfordshire was selling complete ready-to-use computers in change cases with Perspex side panels and no CE mark. He besides noticed that this workshop and another were selling evacuate computer cases with Perspex side panels. He wrote to Hertfordshire trading Standards pointing out the lack of CE mark on the arrant computers. He besides stated that if a Perspex side case is used, it may be shown by any competent EMC test testing ground that it is not possible to assemble a calculator system which could meet the specifi- cations for product test required for CE complaisance. In detail, it would exceed the limits for radiate emission above 30 MHz, as set out in EN Regarding personal computer cases with Perspex english panels, Herts trading Standards stated that these side panels, supplied on their own do not have any electrical components and do not require CE marking. They besides stated, While the side panels of computers normally contribute to the reduction of emissions, an EMC compliant computer may be constructed with these diaphanous components. It would be the province of the person using these components to comply with the legislation. With regard to the PCs with Perspex side panels and no CE score, trade Standards stated that they did not have reason to believe that these computers fail to comply with the legislation but they gave appropriate advice to the retailer on the requirements of legislation with regard to testing, phonograph record keeping and labelling. trade Standards did not investigate further. So it seems that it may not be easy to get Trading Standards departments to investigate specific EMC conformity cases, even where there is reason to suppose that the product in question may be non-compliant. This may be because they do not have the time or resources for adequate enforcement of the UK EMC regulations. HOME NETWORKS With the increasing use of Asymmetric Digital Subscriber Line ( ADSL ) and cable television networks for broadband Internet access, some users are installing home computer networks with a router to allow more than one computer to plowshare the broadband connection. One way of doing this is by using IEEE December 2004 RadCom 39 EMC radio LANs that operate on MHz. As 13cm operators will know, there are a batch of wireless LAN and other signals in the MHz helping of the MHz amateur band present. apart from compatibility issues with the 13cm amateur band however, LANs that use strictly wireless communication do not seem to suffer from or cause many EMC problems with amateur radio operation. other home networks use Ethernet type LANs with unscreened wrench pair ( UTP ) cable. When Ethernet 10Mbps local area networks were first developed, the network cable was coaxial cable. The following genesis was known as 10BaseT and uses four pair UTP cable. This was then developed to 100BaseT which operates at 100Mbps and there have been promote developments to Gigabit Ethernet at 1000MBps, placid using four core UTP. Most ethernet networks in current use are using 100Mbps devices that can operate at 10 or 100Mbps on UTP cable. Ethernet networks using UTP cable came into widespread use in commercial and industrial premises before there was any significant amount of home use, so EMC problems were less likely to be noticed. Because UTP cable television is unscreened, the data needs to be driven along the pairs in a balance manner to avoid radiating hindrance. Signals besides need to be transformer coupled to avoid ground loops between connected devices. Although the UTP cable television itself is well balanced and the drivers and receivers are fairly well balanced, there may however be some commonmode current that causes the cable to radiate interference. One short UTP network cable between two network devices is improbable to radiate much RFI in commit but when several computers are connected to a RSGB FILTERS AVAILABLE FROM THE RSGB SHOP Filter 2 HPF ( for FM Band II ) Filter 3 HPF & braid-breaker ( for UHF television ) Filter 5 Notch at 435MHz Filter 7 Notch at 70MHz Filter 10 Notch at 28MHz Filter 15 Notch at 21MHz Filter 20 Notch at 14MHz retail Price 10.00, Members Price 8.50 each router via long cables, the network may radiate some RFI in amateur bands. Ray, G0VSS reports that he has recently noticed significant noise top out at 3.553MHz in his favorite section of the CW sector. Following respective tests, Ray traced the noise to his recently-installed Netgear DG834G 54Mbps ADSL radio firewall router which is situated in the lounge on the earth floor. The radio networking facility is used by Ray s visiting sons but Ray s own computer is located in one of the upstairs bedrooms, in lapp board as the radio receiver equipment and has a UTP cable connection to the router downstairs. Ray asks where he might get some avail or advice on solving this trouble. On the 3.5MHz band, a device such as a network router is besides little compared to a wavelength to allow it to radiate a meaning total of RFI directly, peculiarly as most types are housed in metallic cases. The most likely source of RF emissions is the cables connected to the router, both network cables and the office cable. humble routers for home function are normally powered by wall wart type circuit board transformers but, nowadays, even modest circuit board transformers may contain a switchmode exponent supply with possible emissions of RFI. The start point would be to check whether the circuit board transformer feels heavy enough to contain an iron-cored transformer. If it feels light, it is credibly a switch-mode type. The following mistreat is to connect the router to the power provision and switch it on with no network cable connected. If there is meaning RFI, a ferrite ring choke or clip-on ferrite core should be fitted to the DC power cable, near the router or the baron provision, depending on which is the generator of RFI. For effective RFI inhibition on any band, it is authoritative to achieve a high enough electric resistance in the ferrite choke, preferably several kilohms or more. With a thin DC power cable, it should be possible to fit eight turns onto a clip-on ferrite core with a 13mm diameter trap, as shown in the photograph. This should give an electric resistance of about 3kΩ on 3.5MHz with a typical clip-on ferrite effect designed for RFI suppression. With any split ferrite core, it is crucial to ensure that the two halves can close together properly without the slightest air out break. The next step is to plug in network cable ( south ) and see whether the RFI increases. If it does, wind each net cable through a ferrite ring with a 23 millimeter diameter hole as shown in the photograph. The grade of ferrite needs to be desirable for inhibition in the HF bands. desirable ferrite rings are available from the RSGB Shop, ( see the box ) but excess ferrite rings with unknown characteristics may not be suitable. Ideally, 12 turns should be used but the maximum count with a network cable will credibly be 10. With a individual surround, this should be fairly effective at 10MHz and above but it will only give an electric resistance of about 1kΩ at 3.5MHz. This electric resistance can be doubled by stacking two rings together. Regarding RF exemption of family networks, wired Ethernet networks normally have good RF immunity, although ADSL modems may be affected by strong RF signals. In such cases, it is worth trying ferrite hoop chokes on connecting cables as described above. Ferrite rings can besides be applied to solving other EMC problems such as RF pickup on loudspeaker cables on audio systems. In any case, the key to achiever is to wind adequate turns on a suitable grade of ferrite to achieve a high adequate electric resistance. Bear in thinker that doubling the count of turns gives four times the electric resistance and halving the number of turn gives one quarter of the electric resistance. promote information is available in the EMC section of the RSGB Yearbook. Filter 8 HPF ( for UHF television receiver, with high rejection of 70cm set ) Retail Price 29.99, Members Price Ferrite rings Retail Price 2.24 each, Members Price 1.92 each or tel : ( office hours ) WEB SEARCH Details of early RA research projects Details of former RA/RTCG project reports research/research-index.htm research/rtcg/projects.htm RadCom December 
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44 ANTENNAS Peter Dodd, G3LDO 37 The Ridings, East Preston, W Sussex BN16 2TW. Antennas More about 7MHz delta-loop antennas how to configure and use them n the September edition of Antennas I described a delta full- loop for 7MHz, where the Iwave vertex of the loop was supported by a little stub mast on the lamp chimney of the house. Since that clock time, I moved the loop away from the house and it is now supported by an 18m high mast. The transmitting efficiency was changed very fiddling by this motivate, but the pick up performance, particularly on 7MHz, was much improved, because of the reduction of electrical interference. On the first night of operation on 7MHz, I heard stations from many parts of Latin America and worked a few of them. If you have two supporting structures, say a mast and the lamp chimney of a house, you could try inverting the loop. This arrangement is used by SM0DTK [ 1 ], with the base of the triangle 13.5m senior high school and fed at the apex near to the ground. According to EZNEC-4, such an inverted cringle would have a reach of around 5dBi over good ground, with a maximal angle of radiation of 50, compared with my loop topology that has a maximum addition of only 1dBi but a maximum radiation of less that 30. The sides of this triangle are 12.6m and the base is 16.9m. SM0DTK has added another identical iteration, located just over 5m away that is tuned with a 100pF capacitor via 4.85m of 450w run lineage so that it can act as a reflecting telescope or conductor. This gives an extra 3 or 4dB addition and a utilitarian front-to-back ratio. The only disadvantage of this arrangement is that it requires four corroborate structures ( in SM0DTK second case, trees ). It occurs to me that such an antenna could be scaled for the higher frequency bands with a iteration spacing musical arrangement that requires only two support structures. THE COMUDIPOLE FEED ARRANGEMENT I received an from ON6TJ, who uses the lapp type of singlesupport delta loop topology as described above. It is fed on one side, λ/4 down ( on 7MHz ) from the vertex, using 450Ω ladder-line. This ladderline does not go straight into the house ; rather it is connected to the balance side of a 4:1 balun located outside the house. The rest of the run into the house is made using coaxial cable cable television. Such an placement, shown in Fig 1, is known as the comudipole ; it was first described in [ 2 ], but can besides be found in [ 3 ]. The lengths of the wheedle and the twin feeder are not critical, although losses will be minimised by having a much of the total self-feeder length as possible being made up of twin self-feeder. I besides use the comudipole feed method for my loop. In this case, the coaxial cable length is 6m and the 450ω ladder-line, 30m. The balun is a PA0SE broadband 4:1 coaxial cable type, as shown in the photograph, and is described in [ 2 ] and [ 4 ]. WHY A 4:1 BALUN ? I was recently asked why the balun in an ATU should use a ratio of 4:1. commodity interview. Most commercial ATUs use a T- peer arrangement, which provides the best compromise between efficiency, ease and monetary value. however the T-match is an brainsick antenna tuner, and some type of balun transformer must be incorporated if it is to be used successfully with balance feeders. While a balun transformer provides a identical bare solution for coupling a balance feeder to an unbalanced tune whole, it may not be american samoa efficient as a properly-balanced ATU. Many published designs use a 4:1 balun on the assumption that most of the balance impedances that will be encountered will be in the range 150 to 600w. The feed electric resistance of the full-wave loop discussed above is around 130w on 7MHz and 1300w on 10MHz ( ignoring reactance ). The obscure distance of the eater might mean that these electric resistance values could have a much wide rate. In commit, the system seems to work, although some experimental cut of the twin self-feeder might be necessary to ensure the antenna loads on all bands of interest. The electric resistance range of the ATU can be increased by having a balun that can be switched from 4:1 to 1:1. If the balun is wound on a ferrite toroid core ( as are all baluns in ATUs ), it can well be modified by replacing the two ( bifilar ) windings with three wires wound trifilar fashion. That is to say, three identical windings are wound on together. Lack of space precludes a description here, but full details of the structure of the G3TSO ATU can be found in [ 5 ] and [ 6 ]. FIG 1 REFERENCES [ 1 ] 2-Element Delta Loop for 40 metres, Martin Hedman, SM0DTK, QTC. [ 2 ] Eurotek, Erwin David, G4LQI, Radio Communication, August 1992 [ 3 ] Backyard Antennas, pp26/27. [ 4 ] Backyard Antennas, pp171/72. [ 5 ] A general-purpose Antenna Tuning Unit, M J Grierson, G3TSO, Radio Communication, August [ 6 ] Backyard Antennas, pp45/46. [ 1 ] 2-Element Delta Loop for 40 metres, Martin Hedman, SM0DTK, QTC.. Top : A 7MHz iteration using the comudipole feed arrangement. The coaxial cable cable from the balun is connected to the wheedle output signal socket of the ATU. Left : The PA0SE broadband 4:1 coaxial balun. See The Comudipole Feed Arrangement. 44 December 2004 RadCom 
45 Steve White, G3ZVW WHATEVER NEXT Moorcroft, Crewkerne Road, Raymond randomness Hill, Axminster, Devon EX13 5SY. Whatever following If you are trapped in the debris after an earthquake, and you see a rat all may not be lost, as G3ZVW explains Is it in truth about 50 years since Sputnik 1 ? Read about the plan celebrations AOR produces an accessory digital part adapter. Rats with electrodes implanted into their brains could soon be helping to locate survivors in collapse buildings. Backpack contains radio sender and electronics that relay the rat ‘s revealing brain signals to the surface Brain implant connected to olfactory, drive and pleasure sensors MAN S NEW BEST FRIEND THE RAT It is a well-known practice to use sniffer dogs to search for survivors in buildings that have collapsed after an earthquake. Their smell of smack is acute, but they can t get into very small spaces. Rats, however, have an equally good sense of smell and can crawl just about anywhere, which makes them ideal candidates for locating bury survivors. now there are plans to equip rats with transmitters, so soon they could be helping to save lives. To become rescue rats, the animals need to be taught to home in on people and signal their position to the surface. When a chase is sniffing for explosives, drugs or shroud people, he makes a unique motion that the coach recognises when he achieves his goal. This wouldn triiodothyronine be slowly with a rat that would be well out of spy in the debris, but in a project funded by DARPA, the Pentagon s research arm, Linda and Ray Hermer-Vazquez of the University of Florida have worked out a means to achieve this. First, they identified the neural signals that rats generate when they find the scent they are looking for so, rather of training the denounce to make a condition reaction, they pick up the reply directly from the brain. Each rat will have electrodes permanently implanted in three areas of the brain : the olfactory cerebral cortex, where the genius processes smells ; the motive cerebral cortex, where the brain plans its next move ; and the honor center which, when stimulated, gives the denounce a enjoyable sensation. First, the researchers trained rats to search for human smell by stimulating the honor center when it found its target olfactory property. Once they were RadCom December 2004 trained they were set to forage for the target smell, while electrodes recorded their brainwaves. This allowed researchers to identify the patterns associated with finding that smell. There are two neural events that we believe are hallmarks of the aha ! consequence for the rat, says Linda Hermer-Vazquez. These are high-frequency activity in one subset of neurons and decreased bodily process in two other areas. Signals from the informer south brain will be connected to a radio vector strapped to the animal south second. Rescuers will be able to follow the rat second position by tracking the signals. They are besides developing software that will recognise the aha ! moment when the rat has found its prey, so rescuers will know where to start dig. The team promise to create a work system within nine months. SPUTNIK S 50th ANNIVERSARY On 4 October 1957, the early Soviet Union launched Sputnik 1 [ 1 ], the first gear man-made object to leave earth south air. The 84kg satellite measured 58cm across and with its launch began the quad slipstream. The fiftieth anniversary of the launch will take place in 2007 and, as function of the celebrations, Arianespace is planning to send 50 mini-satellites into scope for the International Astronautical Federation. They will be launched from a single Ariane rocket. It is planned that each nanosat, weighing precisely 1kg, will represent a nation and will conduct minor research experiments during two years in orbit. Arianespace is identical proud to be participating in this commemoration, said Jean-Yves Le Gall, the party sulfur Chief Executive Sputnik 1, the beginning man-made satellite. For three weeks its two transmitters ( on 20MHz and 40MHz ) sent data associated with the concentration of the upper standard atmosphere, radio receiver propagation and the temperature of the spacecraft. Its establish on 4 October 1957 shocked the Americans, who could hardly believe they had been beaten into space by their arch rivals, the former Soviet Union. Officer. Supporting skill and research is an integral depart of our assign mission. We have already orbited some 40 aide payloads of the same type we will launch in Just like 50 years ago, when the first man-made earth satellite was launched, these nanosatellites will signal a new earned run average for scientists worldwide. accessory DIGITAL VOICE At the holocene Tokyo Ham Fair, AOR unveiled its new ARDV8000, which is a circuit board digital spokesperson adapter. Looking like a slightly overgrow speaker-mic, it surely means that AOR sees a meaning future for digital voice operation on the amateurish bands. Although there is skimp information available on the new product at this prison term, it would be coherent to assume that the ARDV8000 will be compatible with the company s ARD9800 Digital Voice and Image Interface, featured in this column in June The ARD9800 uses G4GUO second open protocol organization and can handle data and SSTV, american samoa well as articulation, but it seems likely that the speaker-mic style ARDV8000 will not handle all or possibly any of the supplementary modes. NOTE [ 1 ] The russian bible sputnik means companion ( satellite in the astronomic sense ). WEB SEARCH Sputnik s fiftieth anniversary Rescue rats 45 
46 DATA Andy Talbot, G4JNT 15, baronial Road, Hedge End, Southampton SO30 0PH. A new concept for packet radio ? More about the mailboat network and its likely. Andy besides begins his series on the function of PIC chips in amateurish radio receiver everal readers wrote in to point out the mistake in the address Sgiven for accessing the ON4KST old world chat room via mailboat radio. Eric G0CGL, owner of GB7CGL, wrote in to say : the ON4KST telnet address doesn thyroxine work. apparently it should be.info and not.ino – this could be gleaned from going to the ON4KST web site but not, I suppose, by anyone who fair has packet and no Internet. Phil Harris, G4SPZ, Chairman of WyrePak ( the Wyre Forest Packet Radio Support Group ) besides wrote to point out the like error, and sent the adopt : Thanks for a peculiarly concern Data column in October south RadCom. I peculiarly liked your reference to the previous packet network still used for the DX bunch, and am delighted to tell you that the package network is decidedly alert and calm thriving ! Internet links now provide rapid and reliable mail forward and real-time keyboard-to-keyboard contacts cosmopolitan. however, an error has crept into the article which would prevent access to the chat room. The correct method of access for package users is to access the BUXTON packet lymph node GB7BUX-8, then enter telnet once connected, at the login prompt, type your callsign. The system will recognise you as a new drug user, and will prompt you to enter your callsign, choose and confirm a password, enter your foremost name, locator and e- mail address. once in the system, comprehensive avail is provided. The dominate /SHOW USER lists all stations connected. Use /Q to leave the chat room. On the nox I tried the 144MHz chew the fat board, over 70 stations ( chiefly EU ) were connected including eight Gs. ON4KST has, in fact, five new world chat rooms covering 50/70MHz, 144/432MHz, microwaves, EME and low bands. Phil besides took the opportunity to attach a copy of the WyrePak Newsletter. He states that, unfortunately, this has now had to return to being a twice-yearly issue, due to coerce of work on the his separate, and miss of contributions. Among its many articles is an interesting contribution from Nick, ZL3TPN, on the department of state of mailboat process in New Zealand. This was actually sent to WyrePak via the packet radio network ! Paula, G8PZT, gave a paper on Globalnet to the 2004 Packet Conference in Worcester recently. Globalnet is an interesting concept which may prove to rejuvenate the mailboat network. The ( slightly paraphrased ) introduction is repeated here, in the corner. It is about a possible global network system for packet radio. Although intended for an hearing of SysOps, the presentation has been edited slightly, but should hopefully give concern readers a taste of what it s all about. PIC MICROCONTROLLER I received a couple of cocksure replies to the idea of covering something on PIC programming within this column, so here goes. The PIC microcontroller was beginning introduced about 12 years ago by Arizona Microchip in an attack to make a low-cost simple cosmopolitan programmable device. Microcontrollers had been about for a long clock time, but most of them tended to be derivatives of more complex micro-computer chips and so needed extra hardware and support chips, ampere well as being rather complicated to program. The master PICs came with a phone number of input signal and output pins, which were designed to be interfaced directly to control circuitry for case they could sink or source 20mA, making them desirable for immediately driving displays. The first generation came with a simple programming rig of just 32 instructions that could be quickly remembered. The devices have become more building complex now, but the basic entry-level devices hush exist, now in even easier-to-use minor formats, and placid remain a low-cost simple solution to doing what differently would have needed a bunch of TTL or CMOS chips to do the old fash- Two off-the-rack PIC programmers. The Microchip Picstart Plus, supplied as region of a complete PIC program system, is shown, in concert with the lower-cost solution, the EPIC programmer, supplied as a print circuit board module. Both are available from mail-order electronic part suppliers. WEB SEARCH Wyrepak package group Arizona Microchip Wisp 628 PIC Programmer ioned way. But before being able to use these devices, even to run code already written by others, we need to be able to blow the code into them with a programmer. Programmers can be purchased cliched from all the electronic suppliers, and these all come with support software which allows you to write the code, assemble it, and programme the devices in one run low. alternatively you can make your own and practice program tools from the web see the Web Search box. GLOBALNET A few years ago, whilst watching people texting on their fluid phones, it occurred to me that here was a relatively slow radio receiver message pitch system which, for all its limitations, had become a alleged cause of death application. so why couldn deoxythymidine monophosphate we do something exchangeable with mailboat radio ? Could text messaging become the killer whale lotion to keep packet alive ? After all, we now had rigs with builtin TNCs, and we had a net which had been moving text around for 15 years or so. All we needed were software and protocols. I had played with APRS message, but it was quite unimpressive. It relied besides heavily on part-time digipeaters on a single clog frequency, and it had a limited horizon of two or three hops. What we needed was something which could deliver messages faithfully over farseeing distances. Something which used the existing net. closely 20 years in the packet game has taught me that the only way to get new things accepted is to do them, and show that they work. sol I set to work on a quarrel of newspaper and have been quietly beavering aside at it ever since. There were several things to work out, but underlying them all was the want to route packets from a reference node to finish lymph node anywhere in the world without any cognition of the intervene networks. Until that could be done, the stay was academician. Paula Dowie, G8PZT The perch of the newspaper can be seen via the Wyrepak vane foliate, given at the end December 2004 RadCom 47 Index – Vol 80 ( 2004 ) INDEX 2004 ANTENNAS Antennas Jan 57, Feb 53, Mar 59, Apr 35, May 44, Jun 57, Jul 64, Aug 49, Sep 54, Oct 52, Nov 42, Dec 44 ATV ATV Jan 79, Mar 76, May 79, Jul 85, Sep 85, Nov 9 AUTHORS OF TECHNICAL ARTICLES Mike Bedford, G4AEE : The Gritstone Challenge Mar 83 J S ( Jack ) Belrose, VE2CV : Electrically-Small Transmitting Loops Jun 64, Jul 88 Ed Chicken MBE, G3BIK : The Programmer and the Keyer Nov 74, Dec 62 R G Danny Dancy, G3JRD : A utilitarian Audio Level Indicator Mar 49 Bruce Fleming, KI7VR : The Two-Element Pentagon for 40m Apr 88 Jonathan Gudgeon, G4MDU : A Morse Code Speed Calibrator Aug 83 Maurice Hately, G3HAT : The Ground-Plane Form of Crossed-Field Antenna May 55 Peter Homer, G4KQU : simple Sound-Card-to-Radio Interface Apr 38 Brian Horsfall, G3GKG : The Doublet De-Mystified Jan 53 David M Jones, G4FQR : Standardising Calibration Capacitors for L- C Meters using a Notch Filter Oct 64 Tim Kirby, G4VXE : Computer Networking and Amateur Radio Apr 45 Vince Lear, G3TKN : An 80- and 40-metre Loaded Dipole Oct 84 Peter Martinez, G3PLX : A Digital SSB Phasing Network Jun 84 Peter Martinez, G3PLX : The Flaw in the Crossed-Field Antenna Theory May 53 Peter Rhodes, G3XJP : PIC-A-STAR : a Software Transmitter And Receiver Jan 48, Feb 44, Mar 56 Andy Talbot, G4JNT : 144MHz Direct-Conversion Receiver with I/Q Outputs for Use with Software-Defined Radio Nov 102 Mike Underhill, G3LHZ : New Truths about Small Tuned Loops in a substantial Environment Aug 60, Sep 61 Ian White, G3SEK : Switch-Mode Mains Power Supplies Nov 70, Dec 59 Lawrence D Woolf, GJ3RAX : comparison of SSB Phasing Methods Feb 47, Mar 47, Apr 68, May 60 CLUBS Club News Jan 12, Feb 12, Mar 14, Apr 12, May 12, Jun 12 Jul 12, Aug 12, Sep 12, Oct 12, Nov 12, Dec th Amateur for 100th Anniversary Jun 10 Basingstoke ARDF Group Promotes IARU-Rules ARDF Jun 10 CONFERENCES, CONVENTIONS, RALLIES, EXHIBITIONS & LECTURES Leicester Amateur Radio Show, 1 / 2 October 2004 Oct 34 RadioSport Calls it a Day Apr 10 RSGB HF and IOTA Convention,2003 Jan 21 RSGB Sponsors Kempton Rally Byte-Sized Lectures Nov 33 Rallies & Events Jan 93, Feb 90, Mar 73, Apr 92, May 92, Jun 91, Jul 92, Aug 90, Sep 90, Oct 91, Nov 108 The Best HF Convention in Years Dec 7 ( see besides HF, Microwave, QRP and Space column ) CONTESTS Contest Jan 70, Feb 66, Mar 68, Apr 78, May 71, Jun 74, Jul 74, Aug 68, Sep 72, Oct 72, Nov 82, Dec 69 National Field Day 2004 Nov 18 RSGB Commonwealth Contest 2004 Oct 20 SSB Field Day 2003, by Alan Hydes, G3XSV May 85 HF 1st 1.8MHz 2003 Jun 75 1st 1.8MHz 2004 Nov 83 2nd 1.8MHz 2003 Jul 74 21/28MHz CW 2003 Aug 69 21/28MHz SSB 2003 Aug 69 AFS 80m CW 2004 Jul 75 AFS SSB 2004 Sep 73 Club Calls 2003 Apr 79 HF Championship 2002 Jan 71 Low-Power 2003 Jun 75 RoPoCo Apr 78 RoPoCo Aug 68 RoPoCo 2003 Jan 70 RSGB IOTA Contest 2003 Feb 79 Slow-Speed Cumulatives 2003 May 71 Slow-Speed Cumulatives March/April 2003, Jun 74 2nd Slow-Speed Cumulatives 2003 Sep 72 VHF / UHF / MICROWAVE 1st 50MHz backpacker 2003 Apr 78 2nd 50MHz 2003 Nov 82 70MHz accumulative 2003 Jan 70 70MHz CW 2003 Mar 69 70MHz trophy 2003 May 72, Oct 73 1st 144MHz backpacker 2003 Mar 69 2nd 144MHz backpacker 2003 Apr 78 3rd 144MHz backpacker 2003 Apr 79 4th 144Mhz Backpacker 2003 May 72 5th 144MHz Backpacker 2003 May MHz AFS 2003 Oct MHz Backpacker Championship 2003 Oct MHz Trophy 2003 Jun MHz UK Activity 2003 Oct MHz AFS 2003 Jan MHz AFS 2003 Jun MHz Low-Power Results 2003 Nov MHz Trophy Jan MHz UK Activity 2003 Dec 70 May 2003 UHF / SHF Feb 67 VHF Championship 2003 Dec GHz / 2.3GHz Trophies 2003 Dec 70 The rules for all RSGB contests are in the 2004 Contesting Guide, published in the January 2004 RadCom, p85. ( see besides Awards and Trophies, and VHF/UHF ) CORRESPONDENCE The last Word Jan 96, Feb 95, Mar 95, Apr 96, May 96, Jun 93, Jul 96, Aug 95, Sep 96, Oct 96, Nov 109, Dec 96 DATA Data Feb 56, Apr 63, Jun 59, Aug 53, Oct 55, Dec 46 DOWN TO EARTH Newcomers News Jan 25, Feb 33, Mar 27, Apr 23, May 23, Jun 25, Jul 23, Aug 25, Sep 21, Oct 23, Nov 23, Dec 23 OPERATING An SSTV How-To, by Joachim Braun, DH5JBR May 24 Minimal Systems for VHF/UHF DX Feb 34 one-man Holiday DXpeditions Jul 24 Project Star Reach : How to Work the 3B9C Rodrigues DXpedition Mar 28 Simple Wire Dipoles Jun 26 The Best HF Convention in Years Dec 7 The Development of the Morse Key Jan 26 World-Wide Young Contesters First International Meeting Nov 25 THEORY An Introduction to Capacitors Aug 26 An introduction to Single Sideband Apr 24 Phase-Locked Loops and What They Can Do Apr 22 Phase Noise and Reciprocal Mixing Oct 24 Why HF radio Waves Travel Around the Globe Dec 24 RadCom December 48 INDEX 2004 EMC EMC Feb 58, Apr 71, Jun 60, Aug 54, Oct 56, Dec 38 EXPEDITIONS / SPECIAL EVENT STATIONS GB Calls Jan 93, Feb 91, Mar 91, Apr 93, May 92, Jun 91, Jul 92, Aug 91, Sep 90, Oct 91, Nov 106 Radio Exhibition and Station at Newhaven Fort Apr 10, May 92, Jun 91 FOUNDATION LICENCE / YOUTH European Science Week : 3 7 November 2003 Jan 11 National Science Week 2004 Jan 6 ( see besides Down to Earth / Courses / Examinations, Licensing ) HELP WANTED Helplines Feb 77, Apr 83, Jun 81, Jul 79, Aug 79, Oct 92, Nov 89 HF HF Jan 63, Feb 62, Mar 61, Apr 73, May 65, Jun 71, Jul 69, Aug 65, Sep 66, Oct 68, Nov 77, Dec 65 RSGB HF and IOTA Convention, 2003 Jan 21 IN PRACTICE In Practice Jan 59, Feb 54, Mar 53, Apr 65, May 48, Jun 55, Jul 67, Aug 58, Sep 58, Oct 61, Nov 46, Dec 56 ANTENNAS Bandwidth of VHF Yagis Sep 58 COMPONENTS Identifying Ferrite Cores Jul 67 IF Filters is there a source which filters are best ? Mar 53 Relay Contact Materials Jun 56 Replacing Rectifier Diodes Dec 57 CONSTRUCTION Checking a Cable May 49 Good-Enough Connectors Apr 65, May 48 Soldering personal computer Boards Nov 46 Stuck and Sealed Dec 56 MISCELLANY Men in Brown Coats II Dec 57 TRANSMITTING AND RECEIVING Free Ferrite Feb 54 Linearity for PSK31 Jan 59 Transmission Quality Monitoring Jun 55 Which Sideband ? Jan 60 INTERNATIONAL MATTERS ( IARU / ITU ) IARU Mar 81, Jun 83, Sep 78, Dec 73 World Amateur Radio Day Apr 11 ( see besides Licensing / Band Plans / Spectrum Abuse ) IOTA IOTA Jan 67, Mar 64, May 68, Jul 72, Sep 70, Nov 80 IOTA 40th Birthday Cruise Jun 5 RSGB HF and IOTA Convention, 2003 Jan 21 RSGB HF and IOTA Convention, 2004 Jun 5 LF LF Feb 72, Apr 84, Jun 77, Aug 71, Oct 76, Dec 75 ( see besides SWL, Technical Articles and Technical Topics ) LICENSING / BAND PLANS / SPECTRUM ABUSE 144MHz Band Plan May 6 Expansion of 40m Band has begun in Europe Feb 10 HF Band Plan Correction Apr 6 MICROWAVE Microwave Jan 76, Mar 75, May 77, Jul 82, Sep 80, Nov 94 MISCELLANY BBC TV Flog It programme to feature amateur radio Feb 11 Blind GB2RS Newsreader Takes to the Air Sep 11 Heyphone to the Rescue May 10 High Honour for Huddersfield Ham May 11 Honours for Amateurs after Project Goodwill Albania Feb 11 Mars Probe Received by Radio Amateurs Jan 10 Mobile Phones and the New Law Jan 10 National Science Week Feb 28 PLT Made Simple Apr 58 RadCom Article Helps TV Documentary Sep 10 Stevenage Communications & Electronics Show 15 February Feb 25 The Night Poland Saved Cowes Jul 10 UNESCO Declares Radio Station World Heritage Site Aug 11 MORSE Morse Feb 70, May 81, Aug 73, Nov 84 NEWS FEATURES 3B9C Rodrigues Island DXpedition Jul Years of the RAIBC May Years a d-day to Remember, by Pat Hawker, G3VA Jun 38 7Q7MM UK DXpedition to Malawi Jul 42 Banaba 2004 the report of T33C Jul 45 CEPT Licence Jul 32 D-Day sixtieth Anniversary Commemorations Aug 32 D-Day sixtieth Anniversary : 6 June Jun 36 Digital Radio Mondiale May 31 Dutch Balloon Foxhunt Sep 30 GB2RS News broadcasts on the Internet Apr 48 Go Back to Your Schools and Prepare to Transmit Oct 40 Half a Century of News Reading from GI3GGY Jun 86 HF Backpacking, or Operating pedestrian Mobile Jun 22 Icom IC-7800 Launched in UK May 37 IOTA DXpedition to EU-109 Jul 55 Logbook of the World Apr 49 National Science Week 2004 May 16 PLT Made Simple Apr 58 Preaching to the Converted Sep 24 Project Goodwill Albania, 2003 Mar 20 RSGB and Power Line Telecommunications ( PLT ) Aug 40 RSGB QSL Bureau Jun 17 Secrets of a Successful Club Sep 42 Sir Ambrose Fleming hundredth Anniversary of the Invention of the Radio Valve Oct 36 SOTA : Summits on the Air Jul 47 The Ultimate DX Oct 38 Visit Åland OH0 Jul 33 You Say Tomayto Apr 16 OBITUARIES / SILENT KEYS Silent Keys Jan 92, Feb 90, May, Apr 91, May 91, Jun 90, Jul 91, Aug 89, Sep 89, Oct 90, Nov 106 Roger Barker, G4IDE, Silent Key Nov 10 John Boylett, G3OLY, SK Jan 6 Marlon Brando, KE6PZH / FO5GJ, Silent Key Aug 10 Minimitter Man David Godwin, G2DOJ, SK Mar 11 Past President Ian Kyle, GI8AYZ / MI0AYZ, SK Sep 6 Les Moxon, G6XN, SK May 10 Ron Roden, G4GKO, SK May 5 Past President Geoff Stone, G3FZL, SK Mar 6 Past President Lord Wallace of Coslany, SK Jan 5, 92 PUBLICATIONS ( see Reviews – Publications ) QRP QRP Feb 71, Apr 85, Jun 78, Aug 72, Oct 78, Dec 77 QSL CARDS / BUREAUX ( see besides HF, IARU and SWL column ) RAYNET / EMERGENCY COMMS Lord Mayor Pays Tribute to Raynet Volunteers Apr 10 Raynet Cracks the Gritstone Challenge Sep 53 Raynet Provides Norfolk Coast Safety Watch Sep December 2004 RadCom 
49 There is only one place you should be on the 4th of December. ( And it isn triiodothyronine sitting at base missing the best clear day of the year ) The ML & S Open Day 09:00-16:00 Saturday 4th December. Representatives from Yaesu, Icom, Kenwood, PW Publishing, RSGB, RAIBC & more Boot sale in the back car park ( First come first placed ) Tons of FREE Parking for all ML & S Customers in our own secret CAR PARK Masses of stock all at unprintable prices Instant Finance available ( STS ), remember to bring I.D. Hog Roast sponsored by Yaesu, Kenwood & Icom Easy to get to and lots to do in Chertsey Town for the family Talk-in on S22 New product ranges ! A newfangled introduction into the U.K. Ham Market available from ML & S. The complete range of NCS rig and receiver switch over products are immediately available from your darling Ham Store. NCS Multi Switcher The NCS Multi-Switcher is a mini-console that lets you switch all operator equipment ( microphone, headset, cardinal, foot-switch, etc ) to any of four radios at the push of a push button. You can switch between a headset, desk or hand mic, TNC, Phone Patch, Sound Card, etc. The Multi-Switcher matches the electric resistance, audio level and pin-out of closely any microphone to virtually any radio including vintage rigs. The Multi-Switcher besides switches your foot- or hand-switch and CW cardinal to the selected radio. Connecting cable for any Yaesu, Icom or Kenwood Radio each For more details and the complete range of NCS products see our web locate. SignaLink ! Model SL-1+Sound Card – radio Interface For all available Digital modes, the SignaLink SL-1+ besides supports the latest Voice modes such as Internet Repeater Linking ( EchoLink, VOIP, etc. ), Remote Base, and Voice Keyer operation. * No serial Port Required * Complete Radio Isolation * Adjustable Rx & Tx Levels * Variable Transmit Delay * Works with ALL Radios * Uses Mic, Data, or Accy Port * Supports All Available Digital and Voice Modes We sell four versions of the enhance exemplar the SL-1+8R with 8-pin beat mic. connection, the SL- 1+RJ45 with RJ-45 mic. connection, the SL-1+RJ11 with RJ-11 mic. connection and the SL-1+6PMD with 6-pin miniskirt Din Data Port connection SL-1+8xxx Interface with fishing gear jumper cable ( you specify ! ) Extra leads ( 8-Pin, RJ-45, RJ-11, 6-pin mini DIN ) Extra leads ( SL-CAB-13I 13-Pin Icom ), ( SL-CAB-13K 13 Pin Kenwood ) Heil Sound We have been Heil stockists for over 15 years. With more space we can offer even more of their excellent product range. The Standard in DX-Audio Engineering. available with either the HC-4 ( DX ) or HC-5 ( HQ High Quality ) microphone inserts. Pro-Set Series All Large Headphones with pad ear-shields and boom-microphone. Don t forget to add the cable interface for your radio. Pro-Set-4 with HC-4 DX Insert Pro-Set-5 with HC-5 HQ Insert Pro-Set-IC with Icom Insert Pro-Set-Plus-IC for Icom & HC4 insert Pro-Set-Plus with double HC4/HC AD-1 Interface Leads for any of the above ( Please specify which radio ) Pro-Set Quiet Phones New secrete from Heil Sound, the Quiet Phone series employ a noise cancelling system to remove external noises & phase reversion to ensure you hear what you want to hear not everything else ! New PSQP-4 with DX insert PSQP-5 with HQ tuck PSQP-IC with Icom insert FS-2 PTT Foot Switch for any of the above earphone systems We besides stock the Goldline & Classic roll, call for details. Call us 6 days a week, mon-sat facsimile : web : local call number LOG ON NOW 
50 Outline House 73 Guildford Street Chertsey Surrey KT16 9AS Did you know ? nowadays we have 4000sq foot of Ham Radio quad we now stock a huge range of accessories including : Maldol HVU-8 The Maldol HVU-8 is a singular and ultra-compact HF, VHF, and UHF antenna developed for merely confined and restricted space installations like apartments and condominiums or for temp or portable use. installation is easily accomplished and convenient due the HVU-8 being only the traditional altitude and weight of HF vertical antenna. The HVU-8 comes with mounting brackets, U-bolts, etc. for easy installation. HVU-8 Specifications Frequency : 80/40/20/15/10/6/2M/70cm bands type : HF and 6M : wave. 2M : wave 2.15 dbi advance 70cm : Two 5/8 waves in phase 5.5 dbi gain Power : 200 watts SSB on HF and 150W FM on 6M to 70 CM SWR : 1.5:1 at field-grade officer frequency Connector : UHF ( SO-239 ) Mast Diameter : inches ( 25-60 millimeter ) Height : 8.5 feet ( 2.62 meter ) Weight : 5 Lbs, 7 ounces. ( 2.4 kilogram ) Maldol HMC-4 Type : Amateur HF/VHF/UHF mobile antenna Band ( south ) : 10m – 1/4-wave 6m – 1/4 wave 2m – 1/2-wave 70cm – 2*5/8-wave derive : 10-0 dbi 6 m – 0 dbi 2 thousand dbi 70 curium dbi Max exponent : 50W Freq scope : 120W ( 10/6 molarity : 80 W ) RX : megahertz electric resistance : 50 ohm, M-plug/PL-259 length : 1.19m Weight : 390gr Manufactured : Japan, x other : desirable for Yaesu FT- 8900R. alone new ! GDX-50 Wide-Band Discone TX/RX Antenna POWER INPUT : 50/144/430MHz distance : 1360mm weight : 910g diameter : 530mm SUITABLE MAST : 60mm only newfangled ! VC-3 Compact ( alone 5300mm ) 7/21/28MHz synchronous converter Dipole ML & S are gallant to be the UK distributor for Hokushin Industries range of products. For many years Hokushin have manufactured swerve setting mobile antennas of the finest quality. All the antenna featured are the conventional M climb that has become the industry standard. The VHF/UHF selection are slender profile with foldover on most models while the HF range are sturdy and durable offer excellent mobile operation. here are some examples of there excellent stove of Maldol Antennas : Apex Range AX /430MHz AX /430MHz AX /430MHz AX /430MHz HFC Range HMC-6S 7/21/28/50/144/430MHz HMC-10 & HMC-14 NEW ! HFC-217 HFC-80L 3.5MHz HFC MHz HFC-40L 7MHz HFC-40 7MHz HFC-20L 7MHz HFC-20 14MHz HFC-15L 21MHz HFC-15 21MHz HFC-10L 28MHz HFC-10 28MHz Maldol Mounts * Barenco Antenna Hardware * Westlake Cables, including Westflex, 300 Ohm Ribbon, 75 Ohm Twin, Rotator cable and a lot more. * Moonraker antenna wire * A accomplished range of plugs and sockets * More antennas than you can imagine, including Cushcraft, Hustler, Butternut, Maldol, MyDEL. * The largest expose of Amateur Radio equipment all wired ready to Try before you buy TYPE 1/4λ 144MHZ, 1/2λ 430MHZ GAIN 3.0dBi 430MHz MAX POWER INPUT 60W CONN. M-P LENGTH 425mm WEIGHT 110g TYPE 1/2λ 144MHZ, 5/8λ 430MHZ GAIN 3.2dBi 144MHz, 5.7dBi 430MHz, MAX POWER INPUT 60W CONN. M-P LENGTH 760mm WEIGHT 140g TYPE 1/2λ 144MHZ, 5/8λ 430MHZ GAIN 3.3dBi 144MHz, 5.8dBi 430MHz, MAX POWER INPUT 60W CONN. M-P LENGTH 950mm WEIGHT 150g TYPE 1/2λ 144MHZ, 5/8λ 430MHZ GAIN 3.5dBi 144MHz, 6.0dBi 430MHz, MAX POWER INPUT 70W CONN. M-P LENGTH 1100mm WEIGHT 150g TYPE 1/4λ 7/21/28/50MHZ, 1/2λ 144MHZ, 5/8λ 430MHZ GAIN 3.5dBi 144MHz, 6.0dBi 430MHz, MAX POWER INPUT 120W 7/21/28, 150W 50/144/430MHz CONN. M-P LENGTH 1800mm WEIGHT 800g 10m & 20m add-ons for the HMC-6 7/21MHz. Max baron stimulation 120W. distance : 1300mm. system of weights : 450g Dual Band VHF/UHFMobile TYPE 1/4λ MAX POWER INPUT 120W SSB CONN. M-P LENGTH 2110mm WEIGHT 530g TYPE 1/4λ MAX POWER INPUT 120W SSB CONN. M-P LENGTH 1540mm WEIGHT 360g TYPE 1/4λ MAX POWER INPUT 200W SSB CONN. M-P LENGTH 1870mm WEIGHT 330g TYPE 1/4λ MAX POWER INPUT 120W SSB CONN. M-P LENGTH 1310mm WEIGHT 210g TYPE 1/4λ MAX POWER INPUT 250W SSB CONN. M-P LENGTH 1515mm WEIGHT 275g TYPE 1/4λ MAX POWER INPUT 120W SSB CONN. M-P LENGTH 1010mm WEIGHT 190g TYPE 1/4λ MAX POWER INPUT 250W SSB CONN. M-P LENGTH 1515mm WEIGHT 250g TYPE 1/4λ MAX POWER INPUT 120W SSB CONN. M-P LENGTH 1010mm WEIGHT 190g TYPE 1/4λ MAX POWER INPUT 250W SSB CONN. M-P LENGTH 1515mm WEIGHT 245g TYPE 1/4λ MAX POWER INPUT 120W SSB CONN. M-P LENGTH 1010mm WEIGHT 190g EMW-325 EM-K EM-L PRM-K PRM-L PRM-T PRM-TW NEW The IC-756PROIII incorporates many of the features that made its predecessors so successful. however, the consolidation of the latest technology employed in the IC-7800 such as receiver technology, +30dBm class IP3, miniscope makes this new carriage the identical acme of the IC-756PRO series. BUY NOW PAY AUTUMN % APR. Icom IC-7800 The worlds best H.F. Transceiver ? Probably. No silly freebies, barely the ultimate understand and corroborate you deserve when making an investment of this order of magnitude. To discuss the fresh HF+6M Super Rig from Icom, call the ML & S Sales team today. RRP : Icom IC-7400 HF/6M/2M DSP Base Transceiver with ATU & 100W. RRP : 1699, ML & S : 1299 with FREE SP-21 & SM20 ( whilst stocks last ) Icom IC-706mkIIG Eight years honest-to-god and however going firm. HF/6/2/70 Ideal mobile/basetransceiver. RRP :, ML & S : 769 or 48 ten p/m Icom IC W Portable HF Transceiver with built-in PSU. RRP : 703, ML & S : 589 or 48 ten p/m Icom IC-718 Basic ready to go 100W HF Transceiver supplied with Microphone & DC Lead. RRP : 649, ML & S : 449 or 48 ten p/m Icom IC-910X The best 2/70 & 23cm dedicated all mood establish. 23cm included. RRP : 1675, ML & S : 1239 or 48 ten p/m Basic Version ( without 23cm ) besides available 1089 or 48 adam p/m Icom IC-R20E The latest portable recipient with TWIN RX & digital commemorate facility. For full specification see web RRP : 499, ML & S : 399 or 36 x p/m Icom IC-2200H Just Arrived ! 65W o/p 2M FM. The optional UT-115 provides digitally modulated and demodulated net sound recording. It besides allows you to send voice and data simultaneously. RRP : 235, ML & S : Icom IC-E208 2/70 mobile 50/55W Transceiver with host of total RRP : 365, ML & S : or 8.14 p/m Don deoxythymidine monophosphate forget ! ML & S are approved stockist for the follow : bhi Ltd, Casio, Icom, Kenwood, Maldol, M each Earpiece & Microphone Headsets available for Yaesu, Icom & Kenwood To see the full stove of Hokushin s celebrated Maldol range please see our web web site or call into the new showroom Icom IC-756 Pro mkiii
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51 Call us 6 days a week, mon-sat facsimile : web : RRP 2495 ML & S or 36 ten Visit hamradio.co.uk for a comprehensive specification BUY NOW PAY AUTUMN % APR. Kenwood TS-2000E Just superb on all bands 160m-2m with optional 23cm ( X-Version ). RRP : 1699, ML & S : 1589 or 48 ten p/m Kenwood TS-2000X As above but with 23cm equip. RRP : 1999, ML & S : or 48 ten p/m Kenwood TS-480SAT The best sell Kenwood H.F. Can be used mobile or base. Includes ATU. RRP : ML & S : 949 or 48 x p/m Kenwood TS-480HX As TS-480SAT but 200 Watts, no ATU. RRP : 1199, ML & S : 999 or 48 ten p/m Kenwood TS-570DGE still the ideal choice if you are cutting on H.F. and want an easily to use radio. RRP : 999, ML & S : 799 or 48 adam p/m Kenwood TMD-700E The singular 700E is not only a dual-band FM rig but has APRS and TNC built-in. RRP : 519, ML & S : 439 or 48 ten p/m Kenwood TH-F7E 2/70 Handie with Gen Cov RX. If you must have SSB RX on your dual-bander then buy one ! RRP :, ML & S : 249 Kenwood TH-D7E A 2/7- Handie with TNC and APRS capability. RRP : 359, ML & S : 299 or 48 ten 8.85 p/m itional features. Power supplies local call number IC-PS-85 20Amp Matching Switch Mode PSU for Icom Base Transceivers … .Only Yaesu FP-30 Internal PSU for FT Yaesu FP-1030A 25 Amp power add Nessei MS Amp continuous power supply. 28 Amp peak Radio Works Carolina Windom Wire Antennas CW m 76.8m retentive CW-160 Special megabyte 40.5m long CW molarity 40.5m long CW-80 special 80-10m 20.1m long CW megabyte 20.1m long CW m 10.36m long CW meter 9.7m retentive G5RV Plus 80-16m with balun 31m long Baluns & Isolators T-4 Plus Line isolator MHz 4kW T Line isolator MHz 500W T-4G Plus Line isolator MHz + gnd4kw REM-BAL Ladder channel 4:1 balun MHz B1-2K Plus 1:1 current balun – for inverted Vs B4-2K 4:1 electric potential balun – loops/folded dipoles Y1-5K Plus 1:1 stream yagi balun MHz MyDEL MultiTrap Forget the G5RV. Install a proper TRAPPED wire dipole MutiTrap for 80-10M Only 66í.Must be centre support MyDEL MegaTrap Same as Multitrap but 160m/80/40m, 105 long Hustler 6-BTV The best perform H.F. Vertical – ever ! We have literally sold hundreds of these with fantastic customer reports. At stopping point a vertical that gives you real PERFORMANCE on 80m and 40m, equally well as the early bands. No radials required. Just mount 18 inches above the land, connect to a decent worldly concern spike close by and operate. specification : 6-BTV HUSTLER 80-10m Vertical 1kW. 6 Bands : 10, 15, 20, 30, 40, 80m VSWR 1.6:1 or better 10-40m Bandwidth up to 100kHz 80m baron : 1kW feed : 50 Ohms Solid 25.4mm traps Feed with any length 50 Ohm coaxial cable Heavy duty aluminum mounting bracket Solid 25.4mm ( 1in ) fiberglass trap formers Use as ground mount with or without radials Use with radials on elevated mount Size : 7.3m ( 24ft ) – system of weights : 7.5kg. entirely If you can t mount the Hustler 6-BTV on the prime then the lone choice is the new VK5Jnr. It s so estimable we use one at our new H.Q. ! Maldol VK5-Jnr. BACK IN STOCK ! Compact labor plane antenna covering : 3.5/7/14/21/28mHz. It combines low-loss traps, with newly designed coil-bobbin, that can handle up to 500W on SSB. Adjustable solid radials give directional and omni-directional patterns. All traps and elements are adjustable to cover all bands and desired center frequencies. only Take away now and Pay NOTHING Until This Time adjacent year ! ! Having many years of experience offer specific finance packages for our customers, we can now offer respective options on payment. We have added “ Take-Away now & Pay Later ” to all our products over 199. It works like this : 0 % APR An example of our takeout now : Discounted price of 300. Pay no interest provided you pay by the date the sum is ascribable, in full. After the 12 months menstruation has expired pay for 36 months. TAP Please eminence that interest is calculated from the date of the master agreement. 29.8 % APR. Daiwa Meters Daiwa CN-101L : SWR/PWR Meter Mhz * Frequency range : MHz * Power range : 15/150/1.5kW * might rat : 1.5kW ( 1.8-60MHz ), 1kW ( 144MHz ) * SWR Detection sensitivity : 4W minimum * Input/Output electric resistance : 50 ohm * Input/Output connectors : SO239 ( M ) * size : 80H x 155W adam 100Dmm * Weight : 670g Daiwa CN-103LN : SWR/PWR Meter MHz * Frequency range : MHz * Power range : 20/200W * power evaluation : 200W ( MHz ) * SWR Detection sensitivity : 4W minimum * Input/Output electric resistance : 50 ohm * Input/Output connectors : N type ( N ) * size : 80H x 155W adam 100Dmm * Weight : 670g Daiwa CN-801H : SWR/PWR Meter Mhz * Frequency roll : MHz * Power range : 20/200/2000W * SWR Detection sensitivity : 5W minimum * Input/Output electric resistance : 50 ohm * Input/Output connectors : SO239 ( M ) * size : 109H x 155W ten 120Dmm * Weight : 1000g Daiwa CN-801 : V SWR/PWR Meter MHz * Frequency image : MHz * Power range : 20/200W * SWR Detection sensitivity : 5W minimum * Input/Output electric resistance : 50 ohm * Input/Output connectors : SO239 ( M ) * size : 109H x 155W ten 120Dmm * Weight : 1000g Daiwa CN-801S SWR/Power Meter Ghz * Frequency range : Ghz * Power rate : 2 / 20 watts * SWR Detection sensitivity : 0.5W minimum * Input/Output electric resistance : 50 ohm * Input/Output connectors : N Type Connector * Size : 180w x 120h ten 130d Approx. * Weight : 670g Noise decrease bhi Ltd. A british company producing probably the worlds best DSP noise reduction speakers and modules. ML & S stock the whole range of BHi products offering excellent technical engineering, quality and dependability. You just wouldn thyroxine believe how much noise these units remove – SSB transmissions about sound FM quality ! NES-5 only Entry Level DSP Noise Cancelling Speaker for AM & FM Reception NES10-2 Only Adjustable Noise Eliminating Speaker NEIM-1031Only Noise Eliminating In-Line Module The same as the NES-10 but an in-line module for you to place between your receiver/rig and own speaker. Six Way Switch Box only Need to Connect more than one piece of equipment to your bhi Noise Eliminating Speaker or In-Line Module ? The 1042 Switch box is the answer … classic Finance example : Kenwood TMD-700E. RRP : 519. payment illustration : Zero deposit and 48 payments of per month. total sum collectible : april : 19.9 %. ML & S is a accredited citation broker. finance offered discipline to status. Full written details on request. E & OE FJ, Miracle Antenna, Oregon Scientic, Revex, Tokyo-Hypower, Watson, Diamond, Yaesu and many more ! ML & S alone ML & S only ML & S only ML & S lone ML & S only 
52 The Miracle Antenna Family Several years ago ML & S bought to you the celebrated Miracle Antenna. The system chosen by Miracle has its imitators but none offer the quality or ultimate performance. The inventor, Robert Victor has added more to the image. Miracle Antenna The Miracle Whip is still the only completely collected, all-band ( including HF/VHF/UHF ) 57-inch telescoping whip antenna with desegregate tuner for receiving and transmitting that mounts right on your radio. nowadays able to handle 20W, the Miracle whip is ideal for all sorts of applications. only Miracle Ducker A miracle whip without the blister. Why ? The advantage is simple. On circus tent of the Ducker is a BNC connection allowing you to connect a random telegram to string up at a permanent ( or irregular ) localization. We even do a Ducker Wire, 20ft or antenna wire terminated with a BNC & Strain stand-in boot. lone Ducker Wire or buy both for Qpak The worlds best Antenna Tuner. In fact it ‘s so well engineered it ‘s just excessively dependable to be called an ATU ! range : Mhz, 50 Mhz limited ability : 20 watts soap SGC As Featured in October RadCom 2004 Loads : Coax, random wire, balanced lines, verticals Match : Up to 15:1 and beyond in some cases particular Introductory volunteer : only SG-211 Latest mini-smart-tuner MHz. 60W soap, Ideal for FT-817 etc. only SG MHz Smart Tuner 100W PEP Max, requires 3W drive minimal. 21ft minimum wire length. alone SG MHz Smart Tuner 200W PEP Max, requires 3W drive. only We always carry the SG Smart Antenna Tuner range MFJ Products MFJ-993 The MFJ-993 IntelliTuner lets you tune any antenna automatically balanced or unbalance – – extremist fast. It s a comprehensive automatic pistol antenna tuning center complete with SWR/Watt-meter, antenna switch for two antennas and 4:1 current balun for balanced lines MFJ The MFJ is a varying L-network random cable antenna radio receiver designed to match the low output signal electric resistance of your sender to the high electric resistance of a random wire ( or frailty versa ) meters. Max 100W. Cheap excessively MFJ-901. HF Antenna Tuner w/ Balun The MFJ-901B is MFJ randomness smallest and most low-cost 200 Watt PEP Versa Tuner. It s designed to match virtually any vector ( up to 200 Watts RF ability end product ) to about any antenna MFJ-904 Tiny Travel Tuner w/ SWR/Wattmeter & Balun. Tiny 4Ω x 2º x 3 inch radio receiver handles full 150 Watts ! Covers Meters, has tuner beltway switch, tunes closely anything ! MFJ-941E 300 Watt ATU with cross needle meter, antenna switch and 4:1 balun. 2 Coax, random wire, balanced line & external dummy load socket MFJ-969 The MFJ-969 Antenna Tuner gives you MFJ ‘s superb AirCore Roller Inductor and wax 6 meteres through 160 Metre coverage ! MFJ-948 The MFJ-948 Antenna Tuner has about all the features ( except dummy burden ) of the MFJ-949E the World s leading 300 Watt antenna tuner – for an fabulously low monetary value MFJ-949 Full MHz Operation. Custom designed inductor throw, 1000 volt tuning capacitors, Teflon insulating material washers and proper L/C proportion gives you arc-free operation with up to 300 Watts 1.8 to 30 MHz. Tunes out SWR on dipoles, verticals, turn back vees, random wires, beams, mobile whips, shortwave receiving antenna. Coax, random wire or balanced lines. Has heavy duty 4:1 balun Don thyroxine forget ! ML & S now stock one of the largest displays of MFJ in the area. Call in today ! W2IHY Graphic Equaliser Get a W2IHY 8 Band Audio Equalizer and Noise gate … and get fix for compliments ! * You can adjust 8 bands of Equalization to give your convey sound recording that full-bodied, entire, wide-band quality ideal for call on the carpet chew. * You can adjust Equalization for an supernumerary edge in contest and dx work. Have pileup busting penetrating audio with significant high frequency content. * You can fine-tune your microphone for more lifelike reproduction of your articulation. * You can make effective microphones sound great and poor people microphones sound adept. TomTom Go lone TomTom GO – the world s bare, smartest, all-in-one car navigator. It s so good Lynchy uses one in his Y4ESU Mobile ! * All-in-one cable car seafaring system with software, maps, GPS and car backing. * Works straight out of the box – just turn it on and GO * Clear talk instructions in your linguistic process * Crystal-clear 3D or 2D views with day and night variations * 1000s of points of interests on the way * Easy to fit and remove Call us 6 days a workweek, mon-sat fax : web : ML & S only local anesthetic call total Linear Amp Range of Amplifiers Challenger 3 The Ultimate H.F. Amplifier * Output might : 1500W SSB or CW, 1000W RTTY * gain : 13dB nominal * world power requirements : 230V AC at 13A, 50/60 Hz * Frequency coverage : All amateurish bands MHz * Valve : Single GS35b ceramic triode * DC electric potential : 3600V DC * Metering : Plate current, Grid current/rf O/P * Dimensions : 16in wide adam 9.5in high ten 17in deep 410mm ten 240mm adam 475mm * Weight : 29kg ML & S 1795 Ranger 811 Bags of Power for Little Money ! * Output world power : 800W CW or SSB, 400W RTTY * acquire : 10dB nominal * power requirements : 230V AC at 8 Amps, 50/60 Hz * Frequency coverage : All amateur bands MHz * Valves : 4 ten 811A, vertically mounted * cool : Papst 120mm axial fan * DC electric potential : 1700V DC * security : elementary AC fuses, soft-start * ALC : Front panel adjustable dominance * Dimensions : 14in wide ten 9.5in high ten 16in deep 355mm adam 240mm ten 405mm * Weight : 23kg ML & S Phone Discovery 2 or 6 ( GS31 ) 2m or 6m translation of this 1kW Amplifier * Frequency coverage : MHz ( Discovery 2 ) * Or 50-54MHz ( Discovery 6 ) * Output power : 1200W * Drive up to : 100W * DC electric potential : 2800V DC * amplification : 12dB noun phrase * world power requirements : 230V AC at 13A, 50/60Hz * Valve : Single GS31 triode * Relays : coaxial O/P, shortstop throw I/P * Metering : Plate stream, Grid current/rf O/P * Dimensions : 14in wide ten 9.75in high adam 17in deep 360mm adam 250mm adam 430mm * Weight : 25kg ML & S 1395 Both the above are available with the GS35 Ceramic Triode producing 1500 Watts output. Discovery 2 or 6 ( GS35 ) 1595 LOG ON NOW 53 INDEX 2004 REPEATERS Repeaters Feb 73, May 76, Aug 75, Nov 91 REVIEWS – EQUIPMENT AOR ARD9800 Fast Data Modem, by Chris Lorek, G4HCL Jul 18 bhi Noise Eliminating In-Line Module and Switch Box, by Chris Lorek, G4HCl Mar 37 Enigma-E : a Fully-Operational electronic Enigma Machine, by John Alexander, G7GCK Jun 32 High Sierra 1800/PRO Mobile Antenna, by Tim Seed, M0FGC / A45WG/M Aug 36 Icom IC-7800 HF / 50MHz Transceiver, by Peter Hart, G3SJX Aug 18 Icom IC-R20 Wideband Portable Receiver, by Chris Lorek, G4HCL Sep 19 Kenwood TS-480HX HF & 6m Transceiver, by Peter Hart, G3SJX Mar 33 Linear Amp UK Ranger 811K Kit, by Steve Icke, G4ZWY Sep 34 Maldol HVU-8 HF/VHF/UHF Base Station Vertical, by Steve Telenius-Lowe, G4JVG Jan 30 Miracle Ducker Reviewed, by Chris Lorek, G4HCL Nov 34 QPak Precision Tuner, by Chris Lorek, G4HCL Oct 32 RIGblaster Pro Soundcard to PC Interface, by Chris Lorek, G4HCL Apr 42 Rohde & Schwarz FSH3 Hand-Held Spectrum Analyser, by Chris Lorek, G4HCL Sep 39 SOTA Beams 2m Portable Yagi Jul 52 Ten-Tec Jupiter HF Transceiver, by Peter Hart, G3SJX Jan 33 Ten-Tec Orion HF Transceiver, by Peter Hart, G3SJX Jun 18 The SteppIR 3-element Yagi Antenna, by Ron Davies, G0WJX Feb 18 The Wonder Wand HF / UHF Portable Antenna, by Chris Lorek, G4HCL Jun 29 REVIEWS SOFTWARE Propagation Prediction in the Computer Age ( DXAID 5.0 ), by Steve Ireland, VK6VZ May 34 RSGB Callseeker Plus 2005 Sep 32 WriteLog for Windows Contest Logging Software an Overview, by Mark Marsden, G4AXX Apr 55 REVIEWS – PUBLICATIONS ( iraqi national congress Video ) Amateur Radio Explained Feb 23 Amateur Radio, the foremost 100 Years Feb 23 APRS Moving Hams on Radio and the Internet Jul 27 ARRL Antenna Book 2004 Jan 39 ARRL Handbook 2004 Jan 39 ARRL Handbook 2005 Oct 26 D-Day Piercing the Atlantic Wall Jun 31 Ham Radio for Dummies Aug 39 HF Antennas for all Locations Sep 32 Hijacking Enigma Dec 81 International Antenna Collection 2 Nov 26 LF Today Oct 26 Low Power Communication the Art and Science of QRP Aug 39 RadCom 2003 Bound volume and CD-ROM Mar 31 Radio Communication Handbook Feb 23 Radio Propagation Principles & Practice May 33 RF Amplifier Classics Nov 26 RSGB Amateur Radio Operating Manual, 6th edition Nov 26 RSGB IOTA Directory fortieth Anniversary Edition May 33 RSGB Technical Compendium Feb 23 The Royal Corps of Signals Unit Histories of the Corps ( ) and its Antecedents Jun 31 The ship that Never Sank Apr 27 Titanic Apr 27 VoIP : Internet Linking for Radio Amateurs Jul 27 White Star Line Apr 27 RSGB MATTERS 7MHz Extension Aug 5, Nov 5 Advanced Radio Communications Exam Syllabus Mar 6 Board and National Council Elections for 2004 Sep 5 Board and National Council Elections for 2005 First Call Aug 5 CQ Hall of Fame Jul 10 Dayton 2004 Jul 5 Examination Fees Mar 6, May 6 HF Convention 2004 Jun 5 Internet Linking NoVs : New Procedures Announced Nov 5 Kenwood Trophy Presentation Apr 5 license : suddenly It s elementary ! Feb 5 New RSGB Board Members Feb 5 Prizes Awarded at AGM Mar 5 Presidential Dinner Tradition Returns Jan 5 Radio Spectrum Consultation Oct 6 RSGB 2003 Annual General Meeting Mar 13 RSGB Sponsors Kempton Rally Byte-Sized Lectures Nov 33 RSGB to Take Over Issuing Internet Gateway NoVs Oct 5 RSGB Old Timers Honour Roll Feb 26 The Radio Communications Foundation, by Bob Whelan, G3PJT Jan 15 Unaudited Income & Expenditure Account for the six months ended 31 December 2003 Mar 12 RADIO COMMUNICATIONS FOUNDATION & GB4FUN Adidas Flora London Half-Marathon May 15 GB4FUN Supporters Honour Roll ( Supporters of the RCF ) Feb 18, Mar 17, Apr 15, May 15, Jun 6, Jul 15, Aug 15, Sep 15, Oct 15, Nov 15, Dec 18 ASE Fun with GB4FUN Mar 17 Funny business at the Eagle Radio Group Sep 15 GB4FUN Continues its Mission Aug 15 GB4FUN Flies the Education Flag Feb 15 Grand Christmas Raffle to Raise Funds for the RSF Oct 15 Out of This World Contact for GB4FUN Apr 15 RCF Awards its First Grant May 15 RCF to Provide Bursaries to Sixth-Form Students Jul 15 RCF Up and Running May 15 School Activity Apr 11 ( see besides Conferences, Conventions and the RSGB Annual Report sent to members as a addendum to the November version ) SATELLITES AND SPACE Space Jan 77, Mar 77, May 78, Jul 84, Sep 84, Nov 96 King s School Canterbury Contacts International Space Station Mar 10 Mars Probe Received by Radio Amateurs Jan 10 New Amateur Satellite Project Sep 10 Oscar-40 in Trouble Mar 10 Oscar-51 Launched Successfully Aug 10 Prof Colin Pillinger at AMSAT-UK Space Symposium Jun 11 RAFARS Members Honoured Mar 10 SWL SWL Jan 69, Mar 65, May 69, Jul 73, Sep 71, Nov 85 TECHNICAL ARTICLES 144MHz Direct-Conversion Receiver with I/Q Outputs for Use with Software-Defined Radio, Andy Talbot, G4JNT Nov 102 An 80- and 40-metre Loaded Dipole, Vince Lear, G3TKN Oct 84 Comparison of SSB Phasing Methods, Lawrence D Woolf, GJ3RAX Feb 47, Mar 47, Apr 68, May 60 Computer Networking and Amateur Radio, Tim Kirby, G4VXE Apr 45 A Digital SSB Phasing Network, Peter Martinez, G3PLX Jun 84 The Doublet De-Mystified, Brian Horsfall, G3GKG Jan 53 The flaw in the Crossed-Field Antenna Theory, Peter Martinez, G3PLX May 53 The Gritstone Challenge, Mike Bedford, G4AEE Mar 83 The Ground-Plane Form of Crossed-Field Antenna, Maurice Hately, G3HAT May 55 Electrically-Small Transmitting Loops, J S ( Jack ) Belrose, VE2CV Jun 64, Jul 88 A Morse Code Speed Calibrator, Jonathan Gudgeon, G4MDU Aug 83 New Truths about Small Tuned Loops in a real environment, Mike Underhill, G3LHZ Aug 60, Sep 61 PIC-A-STAR : a Software Transmitter And Receiver, Peter Rhodes, G3XJP Jan 48, Feb 44, Mar 56 The Programmer and the Keyer, Ed Chicken MBE, G3BIK Nov 74, Dec 62 Simple Sound-Card-to-Radio Interface, Peter Homer, G4KQU RadCom December 
54 INDEX 2004 Apr 38 Standardising Calibration Capacitors for L-C Meters using a Notch Filter, David M Jones, G4FQR Oct 64 Switch-Mode Mains Power Supplies, Ian White, G3SEK Nov 70, Dec 59 The Two-Element Pentagon for 40m, Bruce Fleming, KI7VR Apr 88 A utilitarian Audio Level Indicator, R G Danny Dancy, G3JRD Mar 49 TECHNICAL FEEDBACK A Useful Audio Level Indicator Apr 6 Electrically-Small Transmitting Loops Sep 77 Small Loops Nov 100 TECHNICAL TOPICS TT Jan 41, Feb 37, Mar 39, Apr 29, May 39, Jun 45, Jul 59, Aug 43, Sep 45, Oct 45, Nov 37, Dec 3 ANTENNAS AND EARTHS Antenna Icon John Kraus, W8JK, SK Oct 45 Electrically-Small Transmitting Antennas May 41 Folded Dipole Feed Impedances to Order Mar 41 In Brief Small Transmitting Loops Apr 32 More on Coax Stub Matching Aug 44 Multi-Band Verticals May 40 Reversible Unidirectional Antennas Mar 39 Short Doublets, Inverted Vs & Ground Losses Dec 33 Short-Span HF Antennas & the C-Pole Verical Jul 60 Small Loops & Home-Brew CFL Feb 38 Small Four-Arm CSL Antenna Oct 46 Stub-Feeding 1/2- and 5/8-wave Verticals May 39 Unidirectional [ Yagi/Brown ] Array Mar 39 COMPONENTS Low-Voltage Valves & GDOs Aug 47 Regulator for Super-LEDs May 40 Sensitive 10GHz RF Indicator Jan 46 HERE & THERE hera & There Mar 42, Aug 47, Sep 48, Oct 48 MISCELLANY Another Simple SSB Generator Oct 47 Buying & Selling of Equipment Aug 45 Easy Circuit Board Preparation Nov 40 Errors Nov 40 Looking Back Looking Forward Nov 37 Refuse-Bin ? Repair ? Restore ? Rebuild ? Apr 29 Repairs Revisited Jun 47 More on Bright LEDs Feb 39 Spectrum, Ofcom & PLT Feb 39 SSB Start 1932 to Simple 2004 Aug 43 Simple Superhet with Regenerative Detector Jan 42 SSB & CW on Super-Regens Mar 42 Super-Regenerative Detectors Jan 42 Surface-Wave / Ground-Wave Propagation Apr 31 The Wartime Greats HRO, DST100, AR88 and E52 Nov 39 Ultra-Narrow Filters using Watch Crystals Jul 62 Unbalanced Double-Balanced Mixers Sep 45 VLF /LF Tuning with Power MOSFETS Sep 47 VHF/UHF VHF/UHF Jan 73, Feb 75, Mar 71, Apr 81, May 73, Jun 79, Jul 77, Aug 77, Sep 75, Oct 80, Nov 87, Dec 79 VHF Award News Feb 6, Apr 6, May 6, Jun 6, Jul 6, Oct 6 ( see besides Conferences/Conventions, Data, Licensing and Bandplans, Propagation and Technical Articles ) WHATEVER NEXT Whatever Next Jan 47, Feb 43, Mar 35, Apr 36, May 47, Jun 53, Jul 65, Aug 57, Sep 55, Oct 59, Nov 48, Dec 45 Add-On Digital Voice Dec 45 All-Pervasive RFID Jul 65 Celldar Jan 47 Collapsing Earth s magnetic Field Sep 55 Computing without Electrons Apr 36 Digital Speech Jun 53 flush Faster DSP Mar 45 Ever-Smaller Transistors Mar 45 Home-Brew Chips Mar 45 Hydrogen from Sunlight Oct 59 Icom IC-756PROIII Nov 48 Man randomness Best Friend the Rat Dec 45 Memory Matters Oct 59 Misusing Bluetooth Feb 43 More memory Matters Nov 48 More on the Incandescent Lamp Mar 45 Near-Field Devices May 47 Optical Clock Apr 36 Perfect Lenses May 47 radio-controlled Humans Sep 55 Self-Assembling Transistors Feb 43 Short Range Radar Jun 53 Sputnik s fiftieth Anniversary Dec 45 Walkie-Talkie Phones Update Feb 43 Yaesu FTDX9000 Jul 65 WWW WWW Jan 81, Mar 79, May 83, Jul 83, Sep 82, Nov 98 engage N2PK s Power / SWR Meter Sep 47 OSCILLATORS Update on Huff & Puff Stabiliser Jul 59 well-behaved Crystal Oscillator Nov 38 TRANSMITTING AND RECEIVING Balanced Modulators using Fast Switches Jul 61 Centennial of the Valve Jan 41 Computers for Design & Test Sep 45 DC Power over Coax Feeders Sep 45 Dynamic Power Control MkII Feb 37 Eddystone and the HRO Aug 46 HF Surface-Wave OTH Radars Feb 40 HRO Apr 32 Hybrid Self-Quenching Super-Regen Jun 45 I7SWX s 3.6V 2T H-Mode Mixer/LVDS Squarer Mar 40 I7SWX randomness FST3125 Double-Balanced Mixer Jun 45 last Word on the HRO ? Jun 47 Obsolete HRO of 1939 Jan 45 PA0SE second Sliding Doors Transceiver Oct 47 Signal-Frequency Crystal Filters Jun December 2004 RadCom 
55 The SHORTWAVE Shop 18 FAIRMILE ROAD, CHRISTCHURCH, DORSET BH23 2LJ Phone/Fax Website : communication SOLUTIONS FROM The SHORTWAVE Shop VHF/UHF ANTENNAS FROM HF/VHF/UHF RECEIVERS FROM ICOM, YAESU & KENWOOD LATEST RANGE OF HF TRANSCEIVERS AVAILABLE DAB & WORLDSPACE RECEIVERS MARINE & SECURITY RADIO EQUIPMENT WORLDWIDE DISTRIBUTORS FOR WELBROOK RECEIVING ANTENNAS VISIT : FOR OUR LATEST USED EQUIPMENT LISTING THANK YOU FOR MAKING TRANSMISSION SEPTEMBER A RIP-ROARING SUCCESS ALINCO, AOR, AKD, BEARCAT, COMTEL, DRAKE, FAIRHAVEN, ICOM, KENWOOD, JRC, LOWE, MAYCOM, MFJ, OPTO, WELLBROOK, YUPITERU, YAESU THE COMMUNICATION SPECIALISTS Receivers – Scanners – Transceivers Call & discourse which function of the radio spectrum you wish to operate and we will advise you on the most cost effective way achieving it. Full stove of modern & secondhand equipment available. We store all leading brands : – Airband Amateur CB, Marine Shortwave Licence-exempt transceivers Business and Security Radios 4 MILES FROM BOURNEMOUTH INTERNATIONAL AIRPORT ON B YARDS FROM CHRISTCHURCH RAILWAY STATION. FORECOURT parking FOR DISABLED CONGRATULATIONS TO OUR WINNERS Most Funds Raised by an individual : Daren Loxley M3LOX Most Contacts Made by an Individual : Bob Palmer M3DPQ Most Contacts Made by a clubhouse : Cray Valley Radio Society GB2BF Most Funds Raised by a club : Poldhu Amateur Radio Club GB2GM THINK YOU OR YOUR CLUB DESERVE TO BE KING OF THE JUNGLE ? THEN GET READY FOR TRANSMISSION 2005 ! TRANSMISSION is a national fund-raise event open to all Amateur Radio Clubs and individuals to aid the work of BWBF BRITISH WIRELESS FOR THE BLIND FUND REG. CHARITY No : Gabriel House, 34 New Rd, Chatham, Kent ME4 4QR Tel : 
56 IN PRACTICE Ian White, G3SEK 52, Abingdon Road, Drayton, Abingdon, Oxon OX14 4HP. web site : IN PRACTICE In his close column of the year, G3SEK gives advice on using the bewildering array of adhesives and sealants accumulating in your trail How to choose EHT rectifier diodes to repair your analogue sulfur PSU The return of Dick and Smithy. STUCK AND SEALED Q What kinds of adhesives and sealants do you recommend for typical jobs in amateur radio ? A This question comes about repeatedly, so I will run through some of the options. There is a huge range of adhesives and sealants, and obviously a big lap between the two categories. I made a trawl through the draftsman where such things are kept, and hera are the ones I find useful. Hot-melt glue is both an adhesive material and a sealant. normal glue sticks are made from amorphous polypropylene, a colorless, translucent message which is extremely muggy when melt. Like the hot glue from an oldfashioned gluepot, it sets by plainly cooling. It gives a very thoroughly shackle to about all surfaces, so far does not attack or dissolve them. It can be softened again by heating, of course, so the glue process is frequently completely reversible. With a very specify attempt, even the cold glue can be cut or peeled away from metallic and plastics, leaving the master surface clean and unharmed. This is an impressive align of utilitarian properties, and I tend to use the glue grease-gun more frequently than all the other adhesives and sealants put together. every time I plug in the glue gun, I am grateful to the In Practice reader who ordered me to buy one ! It is very handy for holding components in place, and as an extra strive easing on wires and cables – however they can distillery be moved again if necessary. Hot-melt glue besides survives well outdoors, and the normal polyproplylene material has highly low RF losses ( being closely related to polyethylene ). This makes hot-melt glue the best sealant I have ever found for the ends of coaxial cable antenna feed-lines. The main problem about trying hotmelt glue is that first you need a glue gunman – but they aren metric ton expensive. If anyone is asking you for hints about a Christmas portray, immediately s your opportunity ! To dispense a humble, operate drop of hot-melt glue, you will need a very steady finger on the trigger. But don metric ton practice besides little, either, or else it will cool before it sticks, making the equivalent of a cold soldered joint. never try to spread a flimsy film on to a cool surface, because that will chill the glue about immediately. alternatively, apply a good dollop that will retain its own heat, place the two parts in concert, and squeeze the overindulgence out from the joint. After the glue has cooled a small, you can then cut the overindulgence off. Another minor problem is that hot-melt glue is fabulously fibrous, and will pull out into trailing filaments of amazing duration. The remedy for this is simply solitaire. just leave it be, until the spot of glue has cooled and hardened, and then you can pull or cut off the strings. Don t ever try to shape a spot of glue with your finger while it s molten – it will stick and burn you like a hot mince pie. The glue grease-gun will take respective minutes to warm up ; but having done thus, it will besides stay hot adequate for several minutes after being unplug. This gives you enough of time to take it outdoors and seal the end of a cable. About the entirely application where hot-melt glue is completely useless is … on anything that gets blistering. It is besides quite soft and cartilaginous, even when completely cold. Where those problems are significant, early adhesives or sealants may work better. silicone rubbers share many properties with hot-melt glue, but can besides be used up to moderately high temperatures. On the other pass, they are very compromising, and are only suitable for applications where this is a good thing. Silicone rubbers normally form an adhesive bail that is stronger than the corporeal itself, so they can be very difficult to remove cleanly. besides sili- cone rubbers have quite a long sic or cure time, typically at least nightlong and often 24 hours or more. These materials cure by a chemical reaction on exposure to air or moisture, and they are made in a number of different chemical families. Acetoxy silicone sealants are easy to tell by their characteristic smell of vinegar ( acetic acidic ) and they used to have a bad reputation for causing corrosion on copper. I have never seen this happen myself, and the number of stories about corrosion seems to be balanced by the number of occasions when it has not happened, even in outdoor situations where it might have been expected. however, it distillery seems prudent to avoid the use of acetoxy materials in situations where corrosion underneath the sealant would be identical hard to reverse or repair – above all, when sealing over bare copper braid. Non-acetoxy silicone sealants used to be rather rare and expensive, but are now more readily available from the DIY sheds and builders merchants. I tend to pick up whatever is available, although it isn thymine always easy to tell what the conceptualization is, except by checking that the base hit notices do not say releases acetic acid. A particular non-acetoxy stigmatize that has been recommended is Soudal Silirub 2 Oxime, available in standard 310ml cartridges from some mugwump upvc window merchants. ultimately, do not confuse silicone sealants with acrylic interior designer south caulk – that is a wholly different material, and best keep for its intended purpose. epoxy adhesives are available in a wide range of brands and properties. The type that I tend to keep handy in 56 December 2004 RadCom 57 IN PRACTICE the drawer is rapid ( 10-minute ) Araldite or a finale equivalent. however, this tends to be quite fluid before it cures, and remains quite rubbery afterwards. The original slower-setting type is harder, and better for jobs where force in majority is needed. epoxy adhesives do not react well to UV, and if used as an outdoor sealant they will yellow, harden and lift after a few years. car body makeweight is good where you need a rigid material that can be shaped and even filed when set. Most modern fillers are polyester-based, and contain bombastic amounts of solids that contribute hardness and force. This material sets promptly after mixing with the accelerator, and in bulk it releases considerable heat which accelerates the rig serve. A very similar material is used for anchoring bolt stud into soft brickwork – I can confirm that it sets rock-hard, with embarrassing speed ! Superglue ( cyanoacrylate ) adhesives are useful for their quick-setting properties. however, they do not alliance well to all materials, and although specialist formulations are available, each tends to have quite a limited range of application. ordinary liquid superglue has excellent penetration into narrow cracks, and bonds well to polystyrene and ABS plastics if you hold the joint closed and give the glue some time to harden. It besides excels at bonding ferrite materials, and here it sets very cursorily indeed – there is no second luck. clear Bostik is distinctive of a wide class of clear, soft, solvent-based adhesives that besides make good sealants. It used to be my favorite for outdoor waterproofing, even though it begins to yellow and lift after a few years, but these days I d always use hot-melt glue in preference. The industrial version of this classify of adhesive material is PVC pipe cement, which has a extra use in amateur radio. Self-amalgamating tape and many early sealants do not alliance well to cable jackets and dipole centreboxes made from bendable plastics like polyethylene. The answer is to rub some PVC cement into the coat as a fuse. After it has completely dried, record or sealant will make a good waterproof bond. Sticky foam pads don t alone belong in the stationery cupboard. You can besides use them to tack a little PC display panel onto any commodious anchor degree ( or better, use a double thickness in case of protruding part wires ). Commercially, gluey foam pads are the footing for a wide rate of stickdown plastic pillars, and human body anchors for cable ties. For best adhesiveness, it is crucial to make indisputable that the surface is houseclean and rid from grease or hide oils. The fictile feet and anchors benefit from a light tap with a hammer, applied through a tubular RadCom December 2004 box-spanner to spread the impact. These items can besides be recycled, by scraping the establish sanely clean and then using hot-melt glue. Loctite and exchangeable thread-locking compounds are specialist products with a triple carry through : first as a lubricant while the addict and run off are being tightened ( which prevents annoying of stainless steel threads ) ; adjacent as an anaerobic adhesive that sets inside the threads where air is excluded ; and ultimately as a sealant to prevent home corrosion. Thread-lock comes in four generic colour-coded grades. Red grades are basically permanent wave – if applied correctly, you d credibly have to cut the nut off. greens grades require a bunch of effort to remove the testis, but will keep it locked against quite dangerous vibration. Blue grades are good for antenna study, because it will keep the nut locked against mince oscillation, even allows quite easily dismantling. Purple grades are weakest, for identical delicate parts that could snap if locked besides tightly. There is an excellent scout at And finally, there s Blu-tack – because sometimes you need an adhesive material with a very weak and impermanent halt. A dab of Blu-tack on the conclusion of a ruler or screwdriver is a favorite antic for manoeuvring nuts and screws into inaccessible places. Blu-tack besides makes a reasonably goodly sealing putty, even outdoors, and specially if you need something that can be removed again quite easily. Coax-Seal has better outdoor operation as a sealing putty – but as I ve said here before, I would never plaster it all over an entire coaxial cable connection. That is largely a occupation for sealing record … which is quite another fib. REPLACING RECTIFIER DIODES Q I need to replace a fellate EHT rectifier diode in my valve exponent amplifier, but I can t find that particular type of diode in any catalog. tied a web search fails to bring up any mention to it. A EHT rectifier diodes about constantly fail due to breakdown when rearward biased, during a high-octane depart of the AC mains bicycle. In this application, diodes are always connected in series strings, in ordain to obtain a vertex inverse voltage ( PIV ) capability of several thousand volts – and preferably with batch in reserve against occasional spikes and surges on the incoming mains. Modern diodes will about surely have higher performance than your existing diodes, which are intelligibly a very previous character. But it is not a good idea to replace just one of the honest-to-god diodes with a more modern diode, even if it is better. Mixing diodes in a series string is about guaranteed to cause inadequate part of rearward voltages, and may focus excessive PIV stress onto another of the older diodes. The hardest part of the whole caper has undoubtedly been to remove the rectifier board in ordain to find and repair the blame. You don thymine want to have to repeat that performance, so why not replace all the rectifiers with a new matched set ? The choice for substitution diodes is easy : the 1N5408 is the industry standard for this application. It has generous ratings ( 3A RMS current and 1000V top out inverse voltage ) and is promptly available at first gear price. But before you insert the new diodes, check besides that the old voltageequalising resistors are hush within tolerance. If they are not, they will be making the reverse voltages inadequate, and might well have caused the original blame. identical old resistors are likely to be carbon-composition types, which are ill-famed for drifting erratically higher in immunity over the years. If you find a problem with any of the equalising resistors including the ones for the EHT smoothing capacitors replace the whole lot with 3W metallic film resistors of the correct original value ( eg the Philips/BC PR03 series ). While you have the amplifier in bits, it s worthwhile to do the whole problem. MEN IN BROWN COATS II Hey, Smithy ! What s up ? It s this wyrd erstwhile radio I ve got here, called out Dick. Patiently, Smithy the Serviceman put down his test prods … Familiar ? Anyone who ever read Radio Constructor magazine will surely remember In Your Workshop the adventures of Dick, the apprentice radio/tv repairman, and Smithy, his crafty mentor. No bizarre mistake could always outwit Smithy, and we all followed along as he patiently helped Dick to solve this calendar month randomness problem. Well, they re back ! Along with many more pages scanned from Radio Constructor, a classic choice of In Your Workshop column from 1953 to 1979 is now available at : nav/radcon.htm not bad at all, commented Smithy. I think we can say that we have now achieved an acceptable repair at quite a sanely low cost … THANK YOU ! Thanks to everybody who has sent in questions, comments and ideas during the past year. Although it isn triiodothyronine possible to reply to everyone individually, In Practice exists to pass on your hardheaded have equally much as my own. glad holidays, and my identical best wishes for REFERENCES More information about adhesives and sealants can be found in previous In Practice column. You can search the In Practice Cumulative Index on the world wide web, at : cumulative.htm 57 
58 ic-756proiii new ! The IC-756PRO Series Continues to Grow Incorporating many of the features that made its predecessors indeed successful, the IC-756PROIII employs the latest technology used in the IC-7800 to make this new rig the very pinnacle of the IC-756PRO series. New Features … New telephone receiver gives +30dBm* third-order intercept point real time spectrum scope with mini-scope officiate. low aberration BPF switching Fundamental-type 64MHz roofing filter Pre-amp changed to a noiseless feedback type to reduce 2nd regulate distortion Saturation characteristics of mixer and surrounding circuits improved 8 Channels of RTTY transmit memory adjustable SSB air bandwidth Clock function has been added. Displays local anesthetic clock time, UTC time etc. Screensaver function for prolonging LCD life Features Retained from IC-756PROII act floating point DSP with 24-bit AD/DA converter 51 types of sink band widths can be freely set Soft and Sharp filter shapes to suit the exploiter south operation or band conditions RTTY demodulator/decoder AGC loop management system eliminates blocking by strong adjacent signals real number fourth dimension spectrum scope 5-inch color TFT display and many more outstanding features ! * in the 14MHz band Icom UK Ltd Sea Street, Herne Bay, Kent CT6 8LD. telephone : facsimile : web site : 
59 Ian White, G3SEK, TECHNICAL FEATURE 52, Abingdon Road, Drayton, Abingdon, Oxon OX14 4HP. web site : Switch-mode mains ability supplies region two In the concluding separate of his bipartite article, G3SEK takes up the floor on the secondary side of the main world power transformer. E verything on the low-tension side of T1 ( Fig 5 in Part 1 ) is referenced to mains earth but probably only through the PC display panel mounting screws. besides, beware of high voltages identical close by ! There is mains on the back of the IEC socket, and mains and high DC voltages on the PC board, never more than a finger s-length away. typically, T1 has a individual secondary hoist that delivers something like VAC, and the centretap is connected to the common 0V rail. At the high switch over frequency, very few turns per volt are required, so the wind underground is very low and the ferrite transformer core can be very compact. Multiple paralleled wires help reduce losses due to the hide impression, and are besides easier to wind on to the bobbin. A packaged double-diode, D3a, b, rectifies the 5V provide at up to 20A. A smaller double-diode, D4a, barn, delivers +12VDC, typically at up to 8A. Both of these diode packages are mounted on the second base bombastic heatsink, which is normally connected to the case and to mains earth. Further diode rectifiers RadCom December 2004 produce the low-current -5V and -12V DC outputs, along with a lowcurrent +12V operating supply for the accountant. All of these diodes are high-speed Schottky rectifiers, and if any fail, they must be replaced by similar types. Ordinary rectifier diodes simply won t work – they can not keep up with these high throw frequencies. The output smoothing circuits are basically choke-input filters, although an unusual feature is that all the major output choke windings parcel the lapp toroidal core. L2a is the winding for the +5V output, and in a personal computer it will carry by far the largest current, so the other windings, L2b L1d, are wound in the face-to-face sense to reduce the net magnetization of the core. L3 L6 and their associate capacitors provide farther filtering. The high interchange frequency means that none of the inductors needs to be bombastic, and the polish capacitors can be very little, both physically and in terms of capacitance ( compared with what you d need to remove 100Hz ripple ). however, these are electrolytic A practical modification for +13.8V DC output. capacitors, so they do have a finite function life and may finally fail. VOLTAGE REGULATION Switch-mode exponent supplies are wholly reliant on their control circuits to keep them from catastrophe including catastrophe to the expensive equipment downriver. however, the control circuits are well develop and quite dependable. Most personal computer supplies of the senesce that I m describing are based on the industry-standard TL494 accountant, so count for the 16-pin DIL IC software ( equivalents of the TL494 include the upc494, IR3MO2, MB3759 and KA7500 ; the SG3524 is similar but has a different pinout ). This IC stabilises the output electric potential by driving the switch transistors Tr1 and Tr2 at barely the right pulsate width, and it besides looks after the catchy startup and demerit situations. Close to the TL494, you will much see an LM393 dual-comparator ( or equivalent ) in an 8-pin DIL package, and this is separate of the demerit protection. Although a personal computer provide has at least four different output rails, their voltages are not evenly stabilised. The +5V output has the best stabilization, because that rail is delivering the highest current, and it besides has the greatest indigence for an accurate voltage. All the early end product voltages are determined chiefly by the transformer turns ratio, although the +12V output is besides slightly stabilised as described below. All of these outputs are derived by rectifying the lapp pulse-width-modulated wave form, so this means that the output voltages and currents will interact in quite a complex means. To understand these interactions, we need to know how the TL494 stabilises the +5V output signal. As shown in Fig 6, the TL494 requires an unregulated add of about +12V on peg 12, and an internal voltage governor produces a +5.0V output signal at pin 14. This forms a local provision train for assorted early functions of the TL494, one of which is to provide the reference voltage for the output electric potential accountant. This is based on a simpleton op-amp, precisely as you would find in a ceremonious analogue ( non-switching ) voltage stabilizer. The address stimulation ( pin 2 ) is held at a constant electric potential, derived from pin 14 through the electric potential splitter R4-R5. These two resistors are normally adequate, so the mention voltage at trap 2 is +2.5V. The other input of the op-amp ( peg 1 ) receives a divided-down sample of the regulated output electric potential from R6-R7. As you probably know, an 59 60 technical FEATURE op-amp in a feedback circuit will constantly try to keep the voltages at its invert and non-inverting inputs precisely adequate. In this case, the TL494 achieves that goal by varying the width of the pulses that Tr1 and Tr2 deliver into T1, in such a room that the sample of the output voltage ultimately arriving back at peg 1 is precisely equal to the +2.5V reference voltage at personal identification number 2. In Fig 6, we have made R6 and R7 equal in value, so that the output electric potential will be regulated to exactly twice +2.5V, internet explorer +5.0V. If you want a unlike output voltage, simply adjust the proportion R6 : R7 so that when this new output voltage is divided down, the voltages at pin 1 and pin 2 will placid be equal. Most personal computer supplies include a little trimpot RV1 ( shown as an alternate in Fig 6 ) so that the determine output voltage can be adjusted up or down a small. The +12V rail is normally regulated along with the +5V rail by sampling from both rails at once, as shown in Fig 7. once again, the accountant does whatever is necessity to maintain +2.5V at pin 1 but this means that the two regulated outputs will interact. Neither is a well regulated as it would be on its own, and an increased current requirement on one output will cause an unwanted increase in electric potential on the other. interim the -5V and -12V outputs are at the mercy of changes on either one of the positive rails … but, fortunately, the personal computer can tolerate this. Marty Brown sulfur Power Supply Cookbook ( referenced last calendar month ) explains how the relative electric potential stabilization of the +5V and +12V rails is controlled by the ratio of the currents flowing through R9 and R10 ; the resistor delivering the greater current has the greater degree of control. In personal computer power supplies, the +5V rail requires the better stabilization, so the current ratio between R9 and R10 is typically about 70:30 %. Marty Brown besides explains precisely how to calculate the resistor values – it s nothing more than Ohm south law. In addition to the monitor for voltage stabilization, all four output rails are monitored for over- and under-voltage faults. There is besides a small ferrite transformer that monitors the primary stream of T1, to protect against the whole world power issue being significantly overloaded. The Power Good occupation is a closure input from the personal computer, but the PSU will run with this remark disconnected. All of these protection functions are typically carried out by the LM393 comparator, a few discrete transistors and a handful of resistors, diodes and Zener diodes. The specific circuit details vary ( which has serious implications if you want to modify the PSU for 13.8V DC output ) but all mistake signals finally find their room to pin 4 of the TL494. This stimulation overrides FIG 6 RADCOM 300 RV1 2k R8 3k9 +5V Output R6 4k7 R7 4k7 Fig 5 : See Part 1, concluding month. Fig 6 : electric potential stabilization using the TL494 or equivalent. Fig 7 : stabilization of both the +5V and the +12V rail. 2.5V option to R7 R4 4k7 R5 4k7 Vcc 12 REF V 2 GND 7 TL V Voltage regulator Equal voltages + – control circuits the normal electric potential regulation iteration, and can reduce the width of the drive pulses to Tr1 and Tr2 to a tickover. That will reduce all the output signal voltages, so a fault on any rail can cause the 12V DC fan to slow down or tied stop. In extreme cases the issue will latch into a permanent wave closure country, which can only be reset by switching off the mains. FIG 7 RADCOM V Output 0.7 master of arts R9 RV1 2k R8 3k9 R10 1.0mA +12V Output 0.3 massachusetts R4 4k7 2.5V R5 4K7 REF 14 TL494 SPARES AND REPAIRS I have already pointed out that some of the components in these PSUs are unusual, and many of them are safety-critical. Don metric ton expect to be able to replace them from your junk-box of normal electronic components – it can be dangerous to try. By all means try to find a circuit diagram on the world wide web ; but the manufacturers of personal computer PSUs are very selfeffacing, and often wear triiodothyronine citation either their appoint or a model number on the label. Your next-best friend will be a push-down list of part catalogues, to identify the fail parts. Another alternative is to search for information on the vane, using the part number and data as keywords. It international relations and security network thymine constantly essential to find an claim replacement, but it takes some judgment and know to identify a alleged equivalent that will prove suitable in every significant esteem. And as I warned in Part 1, please try to retain some position about repairing these honest-to-god PSUs. When brand-new substitute PSUs are therefore bum, there is no bespeak in spending more than a few pounds on repairs. fortunately, the components that are most likely to fail are besides the easiest to identify. Part 1 explained that the most highly try components are by and large on the mains stimulation side : BR1, C5, C6, Tr1 and Tr2. The diodes D1 D4 besides lead quite a hard life. failure in the lowvoltage and control areas are relatively much less likely – which is merely a well, because these circuits are much more unmanageable to troubleshoot. Remember that the PSU is a closed-loop see system, thus if any separate of it fails, you will see abnormal electric potential and stream indications everywhere. danger : deep hole ! If you jump to the amiss decision about where the demerit is, you can well create even worse problems by disturbing circuits that are actually perfectly OK. Until you have reasoned out precisely where the demerit has to be, leave that soldering iron alone. MODIFICATIONS Despite these awful warnings about failures and repairs, personal computer power supplies are very identical authentic. When the pillow of the personal computer has reached the end of its utilitarian liveliness, you are quite likely to have a working PSU left over. It then becomes rather tempting to modify the PSU for other uses, specially to provide +13.8V DC to exponent your station. The photograph shows some basic mechanical mods to the PSU that was pictured survive calendar month. Any respectable mod is going to need a mains trade, mains filter, V DC output connection and a permanent dumbbell load on the +5V output. On the PC display panel itself, the options range from minor changes to a near-total rebuild of the end product side … but the detailed variations between different models of PSU take such mods beyond the telescope of a magazine article. I have created a follow-up page that provides far information, and has links to early utilitarian sites : beyond that point, you will have to make your own manner, and I hope this article has given you a utilitarian start. But flush if you never do more than open the PSU to clear the dust out, you now know much more about what goes on inside V 2 GND 7 Equal voltages December 2004 RadCom 
61 Don deoxythymidine monophosphate barely see the testify, hear it Kenwood ‘s new FM dual-channel RX capability special Dual Bander ( 144/430MHz ) gives you and prime performance – all in a truly palm-sized design Receives 2 frequencies simultaneously, even on the same band 0.1~1300MHz RX ( B band ) FM/FM-W/FM-N/AM plus SSB/CW receive Bar antenna for receiving AM broadcasts particular information memory duct RX mode ( 10 channels ) 1200/9600bps mailboat compatible ( ext. TNC ) 434 memory channels, multiple scan functions 16-key pad plus multi-scroll key for easy operation 7.4V 1550mAh lithium-ion battery ( doctor of sacred theology. ) for 5W output and extensive operation Built-in charge circuitry for battery recharge while the unit of measurement operates from a DC supply Tough structure : meets MIL-STD 810 C/D/E standards for electric resistance to shaking, jolt, humidity and light rain Larger frequency display for single-band manipulation Automatic simplex checker Battery indicator Internal VOX MCP software ( absolve download from Kenwood web site ) 144/430MHz FM DUAL BANDER TH-F7E Available from all official Kenwood amateur radio dealers. For full details of our dealer network and all Kenwood amateur products contact your local dealer or Kenwood Electronics UK Ltd 62 technical FEATURE Ed Chicken, MBE, G3BIK Ivy Thorn Cottage, Hepscott, Morpeth, Northumberland NE61 6LQ. The programmer and the cardinal separate here are more circuits using PIC chips. The descriptions are presented here, the source code and layout diagrams being available on the RadCom Plus area of the RSGB Members-Only web site [ L ast calendar month, the first two programs were presented ; here are some more adventurous varieties. KEYER 3 : A PIC 16F872 VARIABLE-SPEED 4 30WPM IAMBIC ELECTRONIC KEYER Fig 2 and Program 3 refer. Fig 2 gives the circuit details for a variable-speed iambic electronic cardinal that can be made by using the Picaxe s own PIC16F872. A stripboard layout is available on the RSGB web site ( see above ). The 16F872 is first programmed in the Picaxe28 using Program 3, besides on the web site. It is then transferred to a Keyer 3 strip-board of your own make, to produce a fully-iambic electronic cardinal with a variable accelerate range of about 4 30WPM. extra Picaxe28 microcontroller ICs are available from the Picaxe supplier ( see last month ), but please be highly careful when removing the PIC from its socket, to avoid bending the DIL pins. Unlike Keyers 1 and 2, the key-common now connects to 0V as is normal practice, with each key-paddle then connected high via an external pull-in resistor. This PIC circuit demonstrates the use of an external variable-frequency oscillator as the PIC clock, using the CLOCKIN pin of the 16F872. The oscillator uses a CMOS 555 timer IC configured as an astable multivibrator, but using a particular RC arrangement which ensures a near 50/50 duty cycle square-wave, varying from 270kHz to 1.7MHz. The argue for using an external oscillator is that the Picaxe28 programs its own PIC randomness inner oscillator for habit with a 4MHz ceramic resonator, which prevents the inner tour from being used as an RC oscillator. That crystal mode does, however, let oscillatory remark from an external source, such as is used here. THE BAS800 PIC PROGRAMMER EXPLAINED Time immediately to leave the Picaxe28, and look to a more versatile PIC programmer, such as the BAS800, available from the same supplier. The follow discussion refers to that programmer in particular, and is the one with which I am most familiar. Programmers from other suppliers would be exchangeable in practice. This one uses PBASIC ( where P stands for PIC ) and the evenly well-known fabrication language, MPASM. A cable is provided which plugs into the lapp PC serial port as was used by Fig 2 Components : Q1 N-MOSFET type 2SK422, 2SK423, BST70, or BS170 78L05 regulator Q3 pre-programmed 16F872. See text. Q4 CMOS 555 C1, C3 100nF poly C2 100pF ceramic R1, R2 1k0 met-oxide R3, R4 68k met-oxide RV1 22k lin Fig 3 Fig 2 Circuit of the PIC16F872 iambic electronic cardinal. Fig 3 Circuit of the PIC16F84A iambic electronic cardinal. to key-jack for Tx with+ve key-line Q4 4 8 NC OV C1 OV black 6V or 12V – piezo + buzzer tip body bolshevik five hundred Q1 OV Picaxe28. Some programmers are designed to use the personal computer randomness parallel port, the choice of series or parallel being personal. Required, but not provided, is a mains-to-9v DC adapter ( preferably, but not necessarily, regulated ) with a positive-tip 2.5mm DC power fireplug. The programmer is easy to use, with clear up user-instructions and fully work software supplied. It is adequate to of programming any of the mostpopular PICs, including that wellestablished work-horse, the PIC16F84A-04/P, which is the one used for Keyers 4 and 5. The Programmer has a quick-release 28- pivot zip up DIL IC socket to accommodate most sizes of PIC. You merely insert the PIC into the socket, follow the instructions given on the personal computer screen to select the type of PIC of your choice, then choice Program PICmicro to load the program from calculator sieve to PIC. That takes but a few seconds. There is absolutely nothing to be afraid of when using a programmer, because if the worst comes to the worst, you simply start again ! In my feel, PICs are about durable. ABOUT THE PIC TYPE 16F84A ( AS USED IN KEYERS 4 and 5 ) note first, that the 16F84A-04/P is barely a faster adaptation of the 16F84 or 16F84A, any of which could be used. A brief description of the 16F84A is justified, because its inner workings differ quite dramatically from the 16F872 as used in Picaxe28. The 16F872 has an analogue-to-digital converter ( ADC ) stimulation port, one 8-bit input signal port and one 8-bit output port, whereas the 16F84A has alone two ports and they are quite unlike those of the 16F872. These ports are called RA and RB, and each has 62 December 2004 RadCom s R1 R2 RV1 OV +5V C2 R3 1 P 2 I 3 C F Q3 Dot paddle LED1 +6V +6V C2 k R1 g Q2 Dot paddle focal ratio RV1 LEDs incandescence undimmed when identify, dim when inactive, out when sleeping ( after a few secant of inactivity ). Auto-awakens instantaneously at touch of either paddle. On/off swich is needed only for PIC-Prog.No.4 in PBASIC. Prog.No.5 in Assembler gives car Sleep/Awaken therefore switch is not necessary OV R4 Dash paddle C1 Dash paddle Q2 Pin View Common on/off throw output 5V input V +9V k OV C3 LED2 + red g black vitamin d s 6V or 12V piezo-buzzer Q1 Optional on/off throw +9V PP3 9V battery OV ( neg ) lean to Tx keying jack body OV ( neg ) Components : Q1 office – MOSFET VN10KM Q2 pre-programmed PIC16F84A-04/p or PIC16F84-04/p LED1,2 mini 3mm green R1 5k6 alloy oxide RV1 22k lin C1 100pF C2 100nF poly 18pin DIL socket RADCOM 291 RADCOM 292 63 technical FEATURE two within it a number of useable circuits called bits or pins. The RA interface has five pins ( RA0- RA4 ) whereas RB has eight pins ( RB0-RB7 ), making a sum of 13 portpins. Each port-pin of the 16F84A can be individually programmed to act as either an input, or an output ! Programs 4 and 5, which use the PIC16F84A-04/P, employ merely four of its 13 port-pins. Two pins are programmed as inputs ( RB4 and RB5 ) for the acid and crash key-paddles, and two pins as outputs ( RB2 and RB3 ) for the buzzer and for transmitter-keying. All other port-pins are programmed as outputs, and are fresh. You will note late on that, in Fig 3, there are no external pull-up resistors shown at the key-paddle stimulation pins. This is because the PIC 16F84A-04P has, within it, a number of what are called soft pull-ups which can be programmed to serve as pull-in resistors at the PIC randomness remark pins, then minimising the need for external components. These pull-ups can be connected to any one or all of the input signal pins and, for Keyers 4 and 5, have been program-connected internally to the two key-paddle input signal pins. The two port-pins used for the paddle-key inputs are chosen specially, because they use the PIC s in-built interrupt facility to awaken the PIC from rest. The sleep command is incorporated in the program for Keyer 5, as are some of the PIC s in-built counters and interrupt-circuits, to shut-down mechanically after a few seconds of no keying-activity. The cardinal awakens instantaneously at the refer of either paddle. Did you ever wonder why your television outside accountant has no on/off switch ? KEYER 4 : A PIC 16F84A-04/P 4 30WPM IAMBIC ELECTRONIC KEYER, WITH BATTERY ON/OFF SWITCH Fig 3 and Program 4 refer, with a strip-board layout and the program being available on the web site. The diagram gives details for this very running iambic electronic cardinal. Like Keyer 3, it again uses an RC clock-oscillator to give a variable Morse-speed range of about 4 30WPM but, this time, the PIC s internal oscillator circuit is use. An on/off switch is included, even though the current drain is only about 2 3mA. Program 4 is written in PBASIC, and is used with the PIC programmer RadCom December 2004 ( not the Picaxe28 ) and a PIC type 16F84A-04P. It was measuredly written in PBASIC to illustrate the proportional chasteness of that programming lyric compared with assembly linguistic process. significant note : before Program 4 can be programmed into the PIC 16F84A-04P, you must make a few minor, but full of life, amendments to its assembler list, as will now be now described. After having selected Convert Basic to Assembler to create the assembler list, but before selecting assemble, make the be on-screen amendments to the assembler list. 1.This changes the character of clockoscillator from default option crystal ( XT ), to resistor-capacitor ( RC ). A few lines down from the start of the assembler list is a agate line which looks like this : CONFIG _CP_OFF & _WDT_ON & _PWRTE_ON & _XT_OSC This tune must be text-edited using the computer keyboard, to read : CONFIG _CP_OFF & _WDT_OFF & _PWRTE_OFF & _RC_OSC 2.This connects the inner soft pull-ups to the key-paddle input port-pins. Further down the platform list is a section with the title : ***** *initialise the ports****** Amend its 4th line : movlw boron to read : – movlw b The assembler list can then be assembled cook for programming the PIC. KEYER 5 : A 4 30WPM IAMBIC ELECTRONIC KEYER WITH AUTOMATIC SWITCH-OFF Fig 3 and Program 5 refer. This is the jewel in the crown, a pleasure to use, and is well worth making. Fig 3, as used for Keyer 4, applies equally to this cardinal, except for the on/off switch, which is not needed. Current-drain shuts down automatically from about 2mA to 1µA after a few seconds of no keying-activity, but the cardinal awakens instantaneously at the partake of either paddle. The LEDs freshness bright when key, blur when passive, and extinguish when asleep ( after a few seconds of inactivity ). Program 5 for this cardinal is to be used with the PIC Programmer. It is written in MPASM forum speech suitable for a PIC 16F84A or 16F84A-04/P. This program does not need to be amended. It is fix for immediate assembly and program of the PIC. Copy-type or copy-paste it into the Programmer Editor screen, choice Assemble, then choose Program PICmicro. The PIC is thereby programmed within seconds, and ready for consumption. WHAT S ON THE WEBSITE ? Quite just : ( a ) Layouts for Figs 2 and 3 ; ( bacillus ) programs 3 5 ; ( speed of light ) a constructional note ; ( five hundred ) an anecdote about the travel rapidly fabrication of a twin-paddle keystone ; ( east ) a simple circuit to use with transmitters requiring positive or negative key. ABOUT PBASIC, ASSEMBLER, ASSEMBLING, AND PROGRAMMING. First, a brief explanation of what happens between typing a PBASIC or assembler program into the calculator, and actually getting it into the PIC. All data into, within, or out-of, a PIC, is in binary form, sometimes called machine-language, eg so, in order to course of study a PIC, the program must be presented to the PIC in binary star form. But, for hardheaded reasons, programs are written in text-based languages such as assembler and PBASIC. Assembler largely uses groups of letters and numbers, whereas PBASIC uses words and numbers. however, in order to platform a PIC, any course of study written in either assembler or PBASIC must first be converted from textbook into the PIC randomness binary star lyric. The PIC Programmer has software for doing that, and the conversion from assembler language to the PIC mho binary star linguistic process is called assembling. furthermore, any program written in PBASIC must be converted to assembly linguistic process before it can be used to plan a PIC. That is promptly done by selecting Convert Basic to Assembler, which causes the PBASIC program on the screen to be replaced by its equivalent assembler program, fix to be assembled before moving on to Program PICMicro. Assemble is an invisible behind-the-scenes process which does not change the screen message, except to display a message assemble successful. Do you nowadays want to course of study the PIC ?. fortunately for us, these conversion processes are done cursorily and mechanically by the PIC Programmer. But there second more, and this reflects in the cost of a PIC Programmer. Before an assembler plan can be assembled, it must have added to it a lot of preparatory data for the shape and setting-up of the especial character of PIC to be programmed. That besides applies to a program written in PBASIC after it has been converted to assembler by selecting Convert Basic to Assembler. The PIC Programmer software again does that automatically to produce what we will now call the assembler number. This includes the program, all the necessary set-up routines and direction sets relative to the choose PIC, instructions such as the character of clock oscillator to be used, eg crystal or RC, and sub-routines to handle PBASIC commands for model pause, sound whether or not they are needed. Leaving them in does no injury, but the type of clock oscillator must be decline for the purpose, and amended if necessary. ( See Keyer 4 and Program 4 ). With the PIC Programmer used hera, a very bonus comes farther down the assembler list, where it displays the original PBASIC program, command by command, each with its equivalent in assembly speech. This is meant for use by students as an presentation to the use of assembler, and is sure to be of some concern to some readers. 63 
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65 By Don Field, G3XTT HF HF RadCom December Shiplake Bottom, Peppard Common, Henley on Thames RG9 5HJ. Don Field reports on a welcome commemorate improvement in HF bands conditions during October with plenty of DX for all. T he bands continued to improve during October, despite days when there were no sunspots recorded at all. The experts are now suggesting the solar minimum could arrive early and the next vertex around 2010 ( see Web search below ). however, late October saw a sudden increase in sunspot activity, back to the level of a year earlier which, combined with a very low K index, led to some superb conditions on all bands, particularly in the week leading up to the CQWW Contest, when many contest expeditions were trying out their stations, and I expect I will have some interesting lector reports for next month. In the contest itself, my own impression was that Saturday wasn t bad, but Sunday was better. On 10m, I noted VK9XD ( Christmas Island ) and XX9C ( Macao ) to the east, and US stations as far west as W7 land, for example. Some united kingdom stations were besides quick to take advantage of the stretch 40m allotment ; K3ZO, for example, told me had run on 7170kHz for about 20 minutes, working some 30 or so united kingdom stations on the trot. Earlier in the calendar month, while 10m had been patchy, there were some occasional openings to all parts of the US and elsewhere, while 12m was absolutely buzzing at times, with signals from Japan, Australia, and pretty much everywhere except the central Pacific area. At the early conclusion of the spectrum, conditions on the low bands have been excellent, possibly the best exemplar being one click opening on topband when Bob, GU4YOX, worked KH6ZM and KH6AT in Hawaii. G3SXW and G3TXF did a great job from Papua New Guinea as P29SX and P29XF respectively, working into the UK on 80 through 12m, despite running just 100 watts, though having their vertical antennas surrounded by sea water did no damage at all ! The FP/VE7SV team ( St Pierre & Miquelon ) were huge signals on all bands from 160 to 10m, feasible well from the UK. TX9 ( Chesterfield Islands ) was a reasonably tougher nut to crack, as were A52CDX ( Bhutan ) and VK9LA ( Lord Howe Island, confused several times on the Cluster with VQ9LA Chagos ) but DX like 9L1ADA ( Sierra Leone ), ZD7 ( diverse suffixes, St Helena ), TJ ( assorted suffixes, Cameroun ) and lots of Caribbean natural process has been relatively easy to snag on multiple bands. not a huge amount of data about forthcoming DX this calendar month. Christmas is a time for families rather than expeditions, no doubt. But plenty of commensurateness to cover, equally well as new Countries Worked and 9 Band Tables. DX NEWS Fred, M0FDH, writes that he will be in Sierra Leone until adjacent July, operating as 9L/M0FDH in his bare time ( he is in the Army ). Danny, F5CW, reports that a new DX reside is about to be available in Senegal ( 6W ), rented out by owner Jan, 6W7RV. More information on the web site. F6GDC, F6CQX and F5SSM will be active on 10-40m SSB ( CW on request ) as 5T5DY from Mauritania from 26 December to 9 January. During the second week Yves will spend three days on Banc d Arguin ( AF-050 ). QSL via F6GDC. Alex, RK3DT, is now in Laos and should be there well into He is signing XW3DT and has already worked into the UK on respective bands. Wade, VE9WGS, writes that particular event callsign VC9COAL will be on the air during December to commemorate the hundredth anniversary of the mention of Minto, New Brunswick, Canada. QSL via VE9WGS. More data will be on the web site. Three french operators plan a DX vacation starting at the end of November. F6COW, F6EPY and F6GNZ will be on Rarotonga, South Cook Islands, 24 November to 9 December with the callsigns ZK1COW, ZK1EPY and ZK1GNZ. From 11 to 23 December they will be on Hiva Hoa, Marquesas Islands, french Polynesia with callsigns FO/F6COW, FO/F6EPY and FO/F6GNZ. They will operate CW and SSB with a small PSK31, RTTY and SSTV by request, concentrating on the low bands when conditions allow. QSL to their home calls. far information on their web site. There are some nice ones to look fore to in the New Year, starting with Peter 1 in January, then Kerguelen, Somalia, Glorioso and others. Watch this space ! CORRESPONDENCE AND TABLES Colin, MU0FAL, reports some decent runs of US stations on 12m ( the benefit of being in a rare DXCC entity, Colin ! ), and a few modern ones. unfortunately his KH6 QSL card came back as not in logarithm, so Colin will just have to try and find another one. David, M0CNP, caught a few nice ones, specially on RTTY where he LEFT Roger, G3SXW / P29SX, with his Butternut vertical close to the ocean. RIGHT Nigel, G3TXF / P29XF, with his erect for 10 / 18 / 24MHz surrounded by salt water. photograph : NIGEL CAWTHORNE, G3TXF. worked VU2WAP ( 20m ), ZC4CI, BX4AN, HI8/JA6WFN, HC8N, EM1HO ( Antarctica ), DU3NXE, EA9IB ( all 15m ), and VQ9LA ( 12m ). Terry, G1UGH, is another one with a busy logarithm, including ( all SSB ) PZ5RA ( 10m ), 5N44EAM, VQ9LA and 5Z4YT1CS ( this callsign was obviously issued without the usual / designator ! ) ( 15m ), 4S7UJG ( 17m ), and 3DA0TM and E20KIR ( 20m ). Stan, G0KBL, reports that he retired earlier this year, but argus-eyed ( and golf-crazy ) XYL and poor conditions have thus far prevented me from becoming a fullfull time DXer ! Nevertheless, Stan recently worked VK9LA ( Lord Howe Island ) on 40m, and managed a VK with one watt on 20m with wire aerials. Dave, G3TBK, and your columnist have been busy this class chasing CW band-countries for the CW table run on-line by G3WGV. Dave, who is in Lincolnshire, comments that he much hears me calling the DX some minutes before he can tied hear it. This, he says, has been peculiarly obtrusive with stations in the Pacific. localization is surely significant, and Dave credibly has an advantage over me to southeast Asia. But for all of us in the UK it can be frustrating to see spots for T30T, as a holocene example, from other parts of Europe, when there is nothing here in the UK. Too much the DX station will move to a higher frequency before propagation reaches us here, and the march starts all over again ! Dave reports that he has been without an 80m DX antenna this class as junior ops M3TBK and M3DVQ insisted he kept up the horizontal dipole for them to use in the 80m Club Championships. Joe, W1JR, says his clock has been about wholly consumed by getting up antennas on his new stronger loom. Joe suffered in a big way with the storms that hit the East Coast of the US earlier in the class, with a lightning strike taking out pretty a lot everything within a 500m radius. Given that he was entirely off the air for a while, it is noteworthy what Joe has managed to work this year. Joe says, This is shaping up to be a very hapless year DX wise. evening with all the DX I missed and those promised, I doubt that the total available will be anywhere near 290 ( as I PHOTO : NIGEL CAWTHORNE, G3TXF. 65 66 HF recall last year was ) and I ll be lucky to snag 275, one of my lowest years yet ! possibly, Joe, but you re doing well therefore far ! Chris, G4JAG, writes that he is nowadays active voice from Thailand as HS0ZFP. He listens on 20m most evenings. He looks forward to working his old friends in the UK and finds the best time is around David, MM5DWW, had a ball with the CQ WW RTTY contest at the end of September, making 645 contacts in 75 countries, including a 9J2 ( Zambia ) for a new one. This was followed, after the contest, by PY0F/PS7JN ( Fernando de Noronha ) for another new one on RTTY. As he says, I think I like this RTTY ! For the foremost six months of the year David was using 100W to a vertical antenna, but now has an Optibeam OB9-5 for 10 to 20m, and has purchased an Acom 1000 amplifier. Having seen David s log for the wholly year, I have to say that even with the more modest set-up earlier in the year, he was working some excellent DX. He is located in the Orkney Islands. Mark, MM1APX, besides in the Orkneys and not besides far from David, writes that in May he took the plunge and made a real campaign with CW. Since then, he says, I have worked 87 countries on CW and have never looked back. My speed is still relatively slow, but I am getting there. It s great fun and quite addictive ( once you get over the nerves ! ). I would encourage any former class B like myself to give it a go – they may be pleasantly surprised. noteworthy late contacts include ( SSB ) FM5DP on 40m, 5Z4YT1CS, S92BWW on 20m, 5N44EAM on 15m, and VQ9LA on 12 and 15m. On CW, EM1HO on 15m, 4S7EA on 17m and SU8BHI on 40m. As Mark says, not besides regretful using 100W and a G5RV. As I always comment on such occasions Mark, just think what you could do if you had a proper antenna ! Mark, G0LGJ/M, has nowadays reached 100 countries for the year from his mobile station, late highlights include TU1PM on 17m, FP/DK6XR on 20m and AC6AA ( Arizona ) on 15m. Chris, G1VDP, writes with an across-the-board update, all SSB. There international relations and security network triiodothyronine truly distance hera to do justice, but JU1DX ( Mongolia ), VU3DJQ, 9Y4ZC, HK1XX and FP/DK6KR on 20m were all-time new ones for him, as were HS0/IK4MRH on 15m and ZP4KFX on 12m. Mike, G6HOU, was on for the RSGB 21/28MHz SSB contest on 3 October, and worked some nice ones : VQ9 ( Chagos Is ), Z2 ( Zimbabwe ) and HF0 ( South Shetland Is ). He used a telegram antenna for 15m and a Yagi for 10m. In the 13 months since Mike returned to amateur radio, he has worked 114 DXCC, and five continents on 10, 15 and 20m. Gus, M5GUS, in Truro uses a Kenwood TS-690S and half-size G5RV. Recent DX includes 3DA0TM ( Swaziland ), FR/PA3GIO ( Reunion ), HF0QF ( South Shetland ) and VE8AP ( Northwest Territories ), all on 20m. Dave, G4FVK, reports that he has found conditions good at times, specially on 15m. Some of his well QSOs were TG and YV on 15m and VK4 on 40m CW in the Oceania contest. Jack, G3WP, sends in a score for the beginning clock time this year. He comments that this is the first meter in years that his total doesn thyroxine show a individual VK or ZL, which he attributes chiefly to not keeping late hours and missing the dawn openings ! Lionel, 2U0GSY ( from 1 October, previously MU3GSY ), says he has already noticed a dispute since being able to run higher power. For example, he managed to work ZL for the beginning time in the Oceania Contest. I was delighted to receive a report from previous supporter Cris, GM4FAM. Cris was hoping to be active agent in the CQWW Phone and CW contests to bump up the scores a bit before the year-end. Robin, M5AEF, sends a farseeing list of stations worked with his 1 watt of QRP. Robin says, Pick of the crop has to be D4B, TF4M and TF3AO. I have found it peculiarly unmanageable to make any headroom on 40m SSB as the set is army for the liberation of rwanda excessively crowded at the moment. It is identical a lot easier to make two-way QRP contacts on 40m CW as there are more stations listening over a smaller range of frequencies ! My thanks once again to Henry, G3GIQ, for compiling the 9-band tables. Please note the following deadline. I have received quite a distribute of agreement regarding both the alltime and in-year tables with respect to the inclusion of oversea entrants. There seems to be an overriding opinion that, while it has been interesting to see what can be achieved from other parts of the earth, it would be inappropriate for the tables to become dominated by big guns from around the world if the precedent is allowed to continue. There are already several all-time tables published ( for case by 425 DX News and, for confirm entities, the ARRL Challenge listings ), and at least some in-year tables, run for model by the major DX club. I therefore project that, for the following 9-band table and for the 2005 in-year tables, we restrict participation to british Isles stations entirely. Until then, the status quo prevails. finally, a minor correction to last calendar month s column which is that Mike, heading to the Antarctic, is GM0HCQ and not GM0CHQ. My apologies both to Mike and to G0CHQ, who pointed this out. Finger perturb ! 9 BAND TABLES No 52 MIXED MODE CALL W1JR G3KMA G4BWP G3XTT GW3JXN G3GIQ G4OBK G3SED G3TXF G3SNN GM3YTS G3TBK G3LAS G3YVH G3IFB G4PTJ GM3PPE G0JHC G3VJP G3AKU G3KMQ G5LP G3VKW G3IGW G4WFQ WEB SEARCH 6W Shack for rent : french DX Vacation : P29SX / P29XF : solar minimum information : 18oct_solarminimum.htm ? list VC9COAL : COUNTRIES WORKED, 2004 ( sorted this month by SSB totals ) CALL CW SSB DATA MIXED W1JR MM5DWW G4NXG/M G3TBK M5GUS GM0TGE G3XTT G4WXZ VK4BUI M0BKV G1VDP MM1APX G4OBK G0LGJ/M G1UGH MU0FAL GM8OEG M0CNP U0GSY G0GFQ G4FVK GM4FAM G3LHJ M5AEF ( 1W ) G7CLY G3YVH G3TXF G4DDL G3ZRJ G0KBL G4KFT G3SXW G3VDL G4IRN G3YMC ( QRP ) M0BVE GU0SUP G3WP December 2004 RadCom 67 HF TOTAL THANKS Special thanks go to the authors of the following for information extracted : OPDX Bulletin ( KB8NW ), The Daily DX ( W3UR ) and 425 DX News ( I1JQJ ). Please air items for the February emergence by 25 December. My thanks to all who have contributed to the column or given me feedback as the year has gone on. My identical dependable wishes to one and all for the gay season. M0AWX G4OWT G4NXG/M G4BGW G0PSE MU0FAL G0LRX G4FVK MM0BQI M0CNP M3CVN M5AEF AVERAGE CW ONLY W1JR G3KMA G4BWP G3XTT G3TXF GW3JXN G4OBK GM3YTS GM3POI G0NXX G3SED G3YVH G3SXW G3LAS G3AKU G5LP G3NOH G3KMQ G4PTJ G3VJP G3VKW G4WFQ G4OWT G4BGW G0PSE MU0FAL GM4FAM MM0BQI AVERAGE Next deadline 8 January Prepared by G3GIQ RadCom December 
68 FT-817 ND RadCom Readers only. Please ask when ordering. Expires 31/12/04 PLUS FREE TRAVEL CHARGER 110/230V Experience the freedom and excitement of taking a complete HF post with you in your carry-on baggage or brief case. All modes and allbands from 160m to 70cms. And with broad-band receive, there is even more use. Supplied dispatch with microphone, Ni-MH battery compact VHF/UHF whip and standard charger. The universe s most popular QRP radio. And until 31st December we will give you a unblock 110/230V travel charger that can besides power your radio. 499 FT-857 D VX-7R PLUS FREE TRAVEL CHARGER 110/230V RadCom Readers only. Please ask when ordering. Expires 31/12/04 FT-60E PLUS FREE TRAVEL CHARGER 110/230V RadCom Readers only. Please ask when ordering. Expires 31/12/04 PLUS FREE 3-WAY MAGNETIC ANT MOUNT You choose SO- 239 or 3/8 stud RadCom Readers lone. Please ask when ordering. Expires 31/12/04 here s a mobile radio that gives the might and the power to work DX from car, caravan or home. It randomness operation will match base station designs so far give you all bands from 160m to 70cms. With 100 Watts on HF ( adjustable down to approx 5W ) you are never lost for QSOs. This is a superb plan that benefits from many design features of Yaesu mho bigger radios. But here they are incorporated into one very compact radio with detachable drumhead whole. And until 31st December 04 we will give you a free 3-way magnetic climb for mobile practice. 649 probably the earth s most popular hand-held for 2004, this invention absolutely proves that Yaesu not only make bang-up performing radios, they besides make the toughest in the business. Throw it in a intestine of water and it carries on working – so in the rain it is never a problem. And with this standard of design and three band operation ( 6m / 2m /70cm ) it is no wonder that the radio is so democratic. And if the bands go quietly you can inactive monitor the AM airband, FM air services or the emergency channels. arrange before the 1st Jan 05 and we give you a FREE travel charger. 299 What have those amazing people at Yaesu done now ? They have produced a double band radio ( 2m/70cms ) that sells for a crazy price. Can you believe you eyes. No it is not a print error, this radio does actually sell for just A dual band radio is a standard item in many overact stations and this one gives a hearty 5W output. Built around a robust human body with senior high school impact resistor case, it intelligibly benefits from Yaesu mho major push forward in the professional radio receiver market. Key pad operation and LCD screen extend easy manipulation and until 31st December we will evening throw in a 110/230V change of location charger. 169 
69 By Tim Kirby, G4VXE CONTEST Willowside, Bow Bank, Longworth, Abingdon, Oxfordshire OX13 5ER. CONTEST This time, the standings of UK entrants in several oversea contests plus the common round-up of RSGB contest results. I t south constantly hazardous extracting the results from the CQ magazine tables, as it s so easy to miss some estimable results. I managed to do that final month with the CQWW CW 2003 results. Two early results well worthy of a mention are 20m unmarried band QRP, where G3LHJ achieved World 3rd place and 80m single band QRP where G4EDG took World 1st. Apologies to you both, Derrick and Steve, and most importantly, congratulations on the brilliant results ! MORE overseas RESULTS ARRL DX CW 2004 The results of this contest are available and there are some great achievements from the UK. In the DX Single Operator QRP class, G0DCK takes World 6th place, with GW4ALG taking World 8th place and G3YMC World 9th space. On 20m single band, M5X, operated by G4TSH takes World 2nd seat. On 80m single dance band, G0IVZ takes World 3rd place and GM4YXI takes World 9th place. ARRL DX Phone 2004 G0DCK takes World tenth place in Single Operator QRP ( well done on a place on both modes ! ) On unmarried band 15m, GI0NWG takes World 3rd station, with GW4BLE taking World 4th place. On 20m, MI0LLL takes World 3rd place. On 40m, GI0KOW takes World 1st invest. Some big performances, from the GI gang in particular. Dutch PACC Contest 2004 The organisers of the PACC contest forwarded a well-produced results booklet, showing a good entrance to this contest. There s a healthy entry from the UK. Results are listed by DXCC entity. From England, GB5TT was top multi-operator and G3AEZ, followed by G3LIK topped the Single-Operator category. From Scotland, GM0CRA/P topped the Multi-Op introduction and GM3CFS, followed by MM0WPM were the single-operator entrants. MU3GSY is Single-Operator winner from Guernsey. Congratulations to you all ! GW0MAW SK I was saddened to hear of the premature death of Norman Davies, GW0MAW, on 13 October. Norman was a samara member of the Red Dragon Contest Group, GW8GT, during the 1980s and 90s. He was a exquisite sideband operator, with a very distinctive, boom voice that stood us in dependable stead in many international contests. Rest in peace, old friend. CONTESTS THIS MONTH A couple of interesting HF Contests this month. The ARRL 160m on 3 to 5 December normally brings out some good activity, so it s well deserving trying to get on the band in some form, if you can. then, on 11 / 12 December it s the ARRL 10m contest. Whether the isthmus will open this year, with the declining sunspots is anyone south guess, but it s a rare year when nothing is worked in the contest from the UK. On VHF, the Christmas Cumulatives from 26 to 29 December are a effective opportunity to get on the air for a few contacts after the Christmas festivities. There randomness natural process on 50, 70, 144 and 432MHz and much of the fun is trying to move VHF contesting from the very north of Scotland can be a lonely pastime at times. here s the station of Clive, GM4VVX/P, during the 144MHz Trophy, stations from band to band. ultimately, a identical Merry Christmas and a glad New year to all readers. I hope to hear you on the air out, on one band or mood or another, during GHz / 2.3GHz TROPHIES 2003 A good introduction this year in cattiness of hapless conditions. once again, John Quarmby, G3XDY, pulled off the double in the single-operator section, winning both 23 and 13cm, and narrowly missed taking the G6ZR Trophy. however, in the end, both trophies went to the Parallel Lines Contest Group, G8P. Andy Cook, G4PIQ 1.3GHz Single Operator Section Pos Call Points QSO Loc Pwr Ant Best DX km 1* G3XDY OB x 23Y DL0GTH 684 2* G0RRJ FE Y DK2MN G3MEH QS 50 4 x 44Y DF0OL 622 4* G4SJH PI 15 23Y PA6NL G4DEZ AE x 23Y DF0HS/P G3YJR FJ 6 44Y G5B G4LDR EC 8 55Y G4ALY GHz Multi Operator Section Pos Call Points QSO Loc Pwr Ant Best DX km 1* G8P QD x 23Y DK0NO 742 2* M1CRO/P PU x 23Y DC2OD G5B CE x 23Y DL0GTH G3OHM/P QL x 23Y DF0HS/P G5LK/P OC 60 2 ten 38Y DF0OL G3SDC/P FM 55 67Y DF0HS/P GHz Single Operator Section Pos Call Points QSO Loc Pwr Ant Best DX km 1* G3XDY OB m DF0OL 506 2* G0RRJ FE 20 25Y PA0EZ G3MEH QS 10 2 ten 67Y PA0VVH G4LDR EC 35 66QLY G4ALY GHz Multi Operator Section Pos Call Points QSO Loc Pwr Ant Best DX km 1* G8P QD m DF0OL 477 2* M1CRO/P PU 40 2 x 25Y DK2MN G5B CE thousand PA0WMX G3OHM/P QL m PA6NL 463 * Certificate achiever RadCom December 70 CONTEST 432MHz UK ACTIVITY CONTEST RESULTS showed what a full isthmus 70cm very is. significant openings to Scandinavia occurred in 5 of the 12 sessions – a much better record than the corresponding 2m events can boast. overall natural process was actually slenderly up on 2002 with 15 % more seance logs received from about the lapp phone number of entrants those who liked the contest stick with it. Some sessions were clearly more popular than others, with some of the best conditions in the summer creating the greatest exuberance. While bodily process is not huge in this contest, do give some thought to coming on when you re at home on a 2nd Tuesday even of the calendar month it s credibly your best regular opportunity to enjoy some DX on 70cm. Winners were clear in both sections with Bryn Llewellyn, G4DEZ, and the South Birmingham RS, G8OHM, taking their respective sections. however, the competition was for the runnerup positions, with both of these being closely fought. In the Single Operator Fixed section, Neil Whiting, G4BRK, beat Roger Piper, G3MEH, a particularly luminary accomplishment with around a 13dB ERP disadvantage. In the Open department, David Millard, M0GHZ, went out portable after a house motion which left him without proper antennas and high world power, and just managed to dislodge the ever-keen Stephen Bunting, M0BPQ/P, and the Reigate ATS, G5LK/P. Andy Cook, G4PIQ Single Operator Fixed Pos Callsign Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Score QSO 1* G4DEZ * G4BRK G3MEH * PE1EWR G3YDY G0ODQ G8HGN G1ZJP G8FBG M0WYE * G8AHK G3YJR * 2E1GUA M0DDT G3JJZ M1DUD G4XPE Open Section Pos Callsign Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Score QSO 1* G8OHM * M0GHZ/P M0BPQ/P G5LK/P M0WYE/P CONTEST CALENDAR HF Contests Date Time Contest Mode Bands Exchange 3/5 Dec ARRL 160m Contest CW 1.8 RST 11/12-Dec ARRL 10m Contest CW/SSB 28 RS ( T ) +SN 18 Dec RAC Winter Contest CW/SSB RS ( T ) +SN 18/19 Dec Stew Perry Topband Challenge CW 1.8 Grid ( IO91 ) 26 Dec DARC Christmas CW/SSB 3.5/7 RST VHF Contests Date Time Contest Mode Bands Exchange 5 Dec RSGB 144MHz AFS ALL 144 RS ( T ) +SN+Locator 7 Dec RSGB 144MHz Activity ALL 144 RS ( T ) +SN+Locator & Club Championship 14 Dec RSGB 432MHz Activity ALL 432 RS ( T ) +SN+Locator 21 Dec RSGB 1.3GHz/2.3GHz Activity ALL 1.3G/2.3G RS ( T ) +SN+Locator 26 Dec RSGB Christmas Cumulatives ALL RS ( T ) +SN+Locator 27 Dec RSGB Christmas Cumulatives ALL RS ( T ) +SN+Locator 28 Dec RSGB Christmas Cumulatives ALL RS ( T ) +SN+Locator 28 Dec RSGB 50MHz Activity ALL 50 RS ( T ) +SN+Locator 29 Dec RSGB Christmas Cumulatives ALL RS ( T ) +SN+Locator VHF CHAMPIONSHIP, 2003 This year ‘s results are about a duplicate of last year sulfur, with the Five Bells Contest Group claiming overall victory in the open section for the one-fourth year running. They were the entirely group to enter all of the Championship events. The A1 Contest Group was the runner-up in this department. The Single Operator, Fixed Station segment was won for the fourth class running by Roger Piper, G3MEH, who besides managed to enter all of the contests in the VHF Championship. For the second year run, Bryn Llewellyn, G4DEZ, is the runner-up, having entered seven of the VHF Championship events. James Beatwell, 2E1GUA, is the winner of the leading Intermediate station certificate, with Kevin Coyne, M3KGC, claiming the leading Foundation station certificate for this department and the QRP Single Operator section. In the QRP section, Graham Coyne, G3YJR, good managed to stay ahead of James Beatwell, 2E1GUA, to claim foremost position for the second year running. overall, participation in the VHF Championship has increased by approximately 40 % this year with respective new callsigns appearing in the results. Ian Pawson, G0FCT Open Section Pos Group/Callsign Points No of Contests 1* Five Bells Contest Group * A1 Contest Group Northern Lights CG Colchester Contest Group Newquay & District ARS GW8ZRE/P G1KHX/P Herstmonceux Megacycles CG Otley Amateur Radio Society Forth Valley Contest Group G6GVI/P GM4VVX/P 96 3 Single Operator, Fixed Section Pos Callsign Points No of Contests 1* G3MEH * G4DEZ G8SRL G1KHX M0DDT G4APJ G3YDY * 2E1GUA G3YJR G8HGN G3JJZ M1DUD M0ZZO * M3KGC 3 3 Single Operator, Fixed, 25W / Single Antenna Pos Callsign Points No of Contests 1* G3YJR * 2E1GUA G4APJ M1DUD G3JJZ * M3KGC 29 3 * Certificate achiever. 70 December 2004 RadCom 
71 ONLY plus phosphorus & p THE INTERNATIONAL ANTENNA COLLECTION 2 This ledger collects together some of the best articles from around the worldly concern on the subject of antenna. It will appeal to radio amateurs in cosmopolitan, whether they be antenna enthusiasts or not. This book is a follow-up to the highly successful International Antenna Collection, compiled by the same editor. You will find antenna for most of the amateur bands. traditional designs and highly master designs are here, bare and complex. Whatever your prerequisite, you will find something that is directly suited or that sets you thinking about how to solve your trouble. Amongst the hardheaded and highly erudite contents is an invite article by one of America ‘s most respected authors on the subject of aerials. He is Kurt N Sterba, the regular ‘Aerials ‘ columnist of WorldRadio magazine. He considers one of his pet subjects – the much-misunderstood interface between transceiver and aerial. Does your ATU in truth tune your forward pass ? All the facts are clearly presented, leaving the author in no doubt as to the right answer. As ahead, capital care has been taken to ensure that there are antennas to cover about all the bands between 136kHz and 2.4GHz, receiving and transmitting, mobile and fixed. Shipping early on November, order now for prompt delivery. 272 adam 200mm, 204 Pages, ISBN plus phosphorus & phosphorus Non Members Price RSGB SHOP RSGB Lambda House Cranborne Road Potters Bar Herts. EN6 3JE Tel Fax ORDER 24 HOURS A DAY ON OUR WEBSITE The International Antenna Collection A collection of over 50 antenna articles from around the earth. 256 pages, Size : 272 x 200mm, ISBN : Members Non Members Antenna Topics If you are concerned in antenna this book is a goldmine of information and ideas on the subject. Size 297 adam 210mm, 384 pages, ISBN : Members Non Members DELUXE LOGBOOK & DIARY 2005 Finished in glossy metallic copper the Deluxe Log Book is back ! Designed for those requiring more from their Logbook, the RSGB have produced the popular Deluxe Logbook & Diary Containing far more than a standard Log script this edition has been thoroughly revised and updated. Amongst its many features are Band plans, locator maps, lists of abbreviations & codes and a DXCC prefix guide. As common a 2005 diary section is included along with notes of events and contests through the year. This wire adhere book contains generous 255 x 420 logarithm pages yet folds neatly for storage ( overall folded size is 255 x 210mm ). This koran is besides the ideal room to neatly record a hale class of activeness and store it in attractive way for years to come. This handy citation scout is in the ideal set for every day use – the logbook of the hovel ! 4.99 plus p & phosphorus Non Members Price ONLY 8.49 plus p & phosphorus member OFFER ONLY Buy the Deluxe Logbook and Cover for only 9.99 plus phosphorus & p DELUXE LOGBOOK COVER For those wishing to protect their Deluxe Log Book we have developed a newly quality brood for use year after year. The covering is of a cushioned PU construction with a high quality tactile property throughout, whilst being very full-bodied. The cover is finished in classical black with a RSGB ball field Gold Blocked onto the front. The ideal accessary for anyone purchasing the Deluxe Logbook. Size 275 x 230mm plus phosphorus & phosphorus Non Members Price ONLY 4.24 plus phosphorus & p VHF/UHF Antennas A valuable resource for anyone interest in antennas, whether newcomer or experience hand. 128 pages, Size 240 x 174mm ISBN : Members Non Members Logbook : Receiving Spiral-bound A4 Logbook. Enables you to keep a complete record of all stations heard Members 4.99 Non Members Value Logbook : Transmitting Spiral-bound A4 Logbook. Complies with UK license requirements for the right format for logging all your contacts Members 4.99 Non Members ARRL ‘s VHF/UHF Antenna Classics Includes antenna project articles gathered from the 1983 to 2003 issues of QST. First Edn, 2003, ISBN : Members Non Members All prices plus phosphorus & phosphorus 
72 Speaker with bhi DSP noise cancelling 9-35dB 8 filter settings DSP on/off switch and stimulation sensitivity control Plugs directly into 3.5mm speaker socket 3.5mm earphone socket Power 12-24V DC 500mA Up to 5W input and 2.5W output NEDSP1061 Modules 1042 Switch Box – associate up to 6 pieces of equipment to your bhi speaker or faculty. only bhi Ltd, PO Box 136 Bexhill-on-Sea, East Sussex TN39 3WD Tel : fax : web site : DSP Noise Cancelling Products from Don thymine put up with noise and intervention Small DSP pcb module for retrofit applications Single button operation Visual and audio reading of DSP degree 4 switchable levels of noise cancellation 11-35dB Input and output flat alteration Small size – only 27 ten 37 x 15mm Recommended as a dealer retrofit NEDSP106 BD Generic module NEDSP1061-KBD-FT817 FT817 translation NEDSP1061-KBD-TS50 TS50 version NEDSP1062-KBD Amplified DSP module kit ( will retrofit easily into about any extension loudspeaker ) NES E & OE In-line whole with bhi DSP randomness cancellation 9-35dB 8 easy to adjust filter levels Input tied command and separate volume control On/off switch with bypass and earphone socket Audio in/out and line in/out connections 2.5W RMS soap output signal Power 12-24V DC 500mA Supplied with a fuse DC power lead and 3.5mm sound recording conduct NES5 Basic fixed charge ‘plug & go ‘ DSP speaker NCH -12dB ANR make noise cancelling headphones UKPA 12V DC power provide ( NEIM1031, NES5 & NES10-2. ) LSPKR 20W Extension speaker FT-STAND adjustable FT817 stand MP-817 Mini paddle for FT Code Cube other FT-817 Accessories available call us or see our web site for details PRODUCTS ALSO AVAILABLE FROM OUR APPROVED DEALERS Excellent reviews in Practical Wireless, SWM, Radio Active and RadCom bhi NEIM Wonder Wand Portable rig-mounted antenna Features : Covers 40m to 70cm Easy to switch between bands Compact and easy to use Handles up to 25 watts Connects via integral PL259 connection Can be used with most QRP rigs New TCS – Tuneable counterweight for manipulation with the Wonder Wand and other QRP Antenna Wwand offer save 10.00, Wonder Wand and TCS … only Postage and compact ( UK mainland only ) : Up to and above New On-line shop class CHELMER VALVE COMPANY LTD. Supplier of Specialist Electronic Tubes, Semiconductor Devices and Equipment Come to us for all your valve requirements We have huge stocks and are very experience in meeting the needs of amateur radio enthusiasts Visit our web web site : Or enquire by THE STABLES, BADDOW PARK, GREAT BADDOW, CHELMSFORD, ESSEX, CM2 7SY, ENGLAND TEL. No ( 0 ) FAX. No ( 0 ) WEB SITE JOHNSRADIO ELECTRONICS TEST AND COMMUNICATION EQPT LARGE QUANTITY SALE EX M.O.D. MARCONI TF2019A Synthesized Signal Generators – 80Khz to 1040Mc/s AM – FM – high class with many functions each. TEKTRONIX 2445 A OSCILLOSCOPE 150Mc/s Four Channel 300. HP COMMUNICATION TEST SET 8922M Mc/s + GMS 83220E Converter Mc/s – DCS – PCS – MS 500 HP COMMUNICATION TEST SET 8922M OPT 010 ( Dual ) etc, 750. ALL UNITS AND PRICED EX WORKS WITH INSTRUCTIONS – TESTED BASIC WORKING. CARR + PACKING IF REQUIRED EXTRA. telephone for date or to request token lists, photos, site function. All welcome, Private or Trade, sales, workshop repairs or calibration PLEASE CONTACT PATRICIA AT WHITEHALL WORKS, 84 WHITEHALL ROAD EAST, BIRKENSHAW, BRADFORD, WEST YORKSHIRE, BD11 2ER. Tel : fax : WEB SITE 
73 By Don Beattie, G3BJ IARU Hares Cottage, Woolston, Church Stretton SY6 6QD. IARU Region 2 General Assembly and IARU Administrative Council meetngs IARU Region 1 Secretary Don Beattie reports on the IARU Region 2 General Assembly and IARU Administrative Council meetings which took place recently in Trinidad. I n past IARU column I have described the structure of the IARU, with the Executive Committees of its three Regions and the ball-shaped Administrative Council playing a coordinating and leadership role in the affairs of the IARU. The administrative Council meets once a year, and normally has its meet coincident with whichever Regional Conference is taking place that year. In 2004, Region 2 of the IARU held its conference in Trinidad at the end of September, and the AC meeting followed immediately thereafter. In this column I will cover some of the outcomes of these two events. REGION 2 CONFERENCE Some 15 countries were represented at the Conference, draw from the Americas and Caribbean. The Regional Strategic plan was discussed and approved, with its focus on the protective covering and growth of amateur radio in the Region. not unsurprisingly besides, the issue of PLC ( BPL as it is called in the Americas ) was outstanding on the agenda, and resolutions were passed asking extremity societies in the region to take a range of actions to try to avert the risks which BPL poses. All three regions of IARU face similar problems with the proposed authority of PLC / BPL services. Conference besides discussed Emergency Communications at length. This was a timely reminder that, more so than in Europe, Region 2 amateurs are frequently involved in providing communications at times of hand brake. In 2004 the hurricane season has been particularly condemnable, and the Conference was being held just three weeks after hurricane Ivan devastated Grenada and parts of Haiti. Amateurs from Trinidad & Tobago were still in Grenada, providing emergency communications, during the time period of the league. The Secretary General of the Caribbean Telecommunications Union, Bernadette Lewis, talk at the opening of the Conference, publicly recognised the significant function being played by amateurs in disaster relief, but besides challenged Conference to think more broadly about amateur radio receiver randomness function in education and train in the community. besides outstanding was a discussion about intruders on the amateurish bands, where a number of countries in Region 2 appear to have difficulties with unauthorized use of versatile RadCom December 2004 bands. initial discussion besides took target about the IARU scheme for WRC-07. early matters included satellite frequency planning, callsign social organization, contests and awards, some constitutional issues and communication within the Region. The three-yearly Assembly is the opportunity for Member Societies to vote on members of the Regional Executive Committee, and this class, Pedro Seidemann, YV5BPG, stood down as President of the Region, to be replaced by Rod Stafford, W6ROD. The close up seance of the Conference was addressed by the Deputy-Secretary General of the ITU, Roberto Blois, who besides acknowledged the important make being done by amateurs in the field of emergency communications, but reminded delegates that rival for spectrum was intense, and the amateurish radio serve would need to work hard to keep its needs in the battlefront of everyone mho mind. ADMINISTRATIVE COUNCIL immediately after the Conference had ended, the administrative Council ( AC ) meet took target. The AC consists of two members of the Executive Committee of each of the three Regions, plus the International President, Vice-President and Secretary. The follow paragraph cover some of the outcomes of the 2004 meeting of the Council. The Council adopted a three-year plan to develop accompaniment for amateur radio receiver frequency allocations. The plan provides for the IARU to maintain and increase contact with regional telecommunications organisations through its own regional organisations. The Council besides adopted positions on agenda items for World Radiocommunication Conference 2007 ( WRC-07 ). Included in these are that the IARU will seek a future WRC agenda detail looking towards a cosmopolitan amateur allocation at 50MHz. Six metres is not presently available in all parts of the world ( peculiarly many parts of Region 1 ). The Council besides adopted a resolution calling attention to the debt instrument of telecommunication administrations to take all operable and necessary steps to avoid harmful hindrance to radiocommunication services from power and telecommunication distribution networks, including BPL ( Broadband over Power Line ) systems that use the HF spectrum. The Council besides received a report from ITU Development Sector Study Group 2 outlining advance toward revising a Recommendation concerning effective use of amateur radio in disaster extenuation and relief. Amendments to the external Radio Regulations at WRC 2003 placed extra emphasis on this character. Focusing primarily on WRC-07, the Council drew up a number of International Telecommunication Union ( ITU ) meetings during the coming year at which IARU representation will be required and reviewed plans for staffing them. It seems that adenine soon as one WRC is over, work begins on the scheme for the adjacent, such is the frequency of WRCs nowadays. The Council besides charged the IARU leadership with drafting a white newspaper to scope the environment and develop options for the IARU sulfur longterm function and structure. Council members besides discussed issues relating to the constitutions of the IARU and its regional organisations and agreed to consider these matters again when the white wallpaper was further developed. The International Secretariat – ARRL – presented the budget, which includes provision for fiscal contributions from the three regional organisations to defray a fortune of the expenses, in accord with previously adopted policy. The administrative Council s future meeting will be in April In the meanwhile much exploit will be done by person members of the Council to progress the directions agreed at the 2004 meet. Left to right : Pedro Seidemann, YV5BPG, outgoing IARU Region 2 President ; Roberto Blois, Deputy- Secretary General, ITU ; and Rod Stafford, W6ROD, incoming Region 2 President. 73 
74 
75 Dave Pick, G3YXM LF 178 Alcester Road South, Kings Heath, Birmingham B14 6DE. The ATU of Laurence, WD2XDW, built in a stack box. You can see the doorknob capacitors below the vacuum variable. I am blue to report that Larry Kayser, VA3LK, died suddenly in October. He was 64. Larry was a lament experimenter and always put a great cover of attempt into his ham radio. During his LF experiments in 2000 and 2001, his LF forward pass was suspended from a commercial 240ft self-supporting tower, which Larry would regularly climb, and the transmitter could be remotely-controlled from his home reside. After perfecting the post for 18 months, he made one of the first base bipartite trans-atlantic contacts with G3AQC in February This 5420km contact held the bipartisan distance record until The contact took two weeks to complete as the identical boring CW in use only allowed one over to be achieved each night, and on many nights conditions weren metric ton good adequate to receive any signals. Larry then concentrated on trying to get a signal to New Zealand with regular beacon transmissions which were received around the USA and Canada, and into Holland, Portugal and Italy on this english of the ocean. In his ceaseless quest for newfangled challenges, Larry had most recently been trying to cross the Atlantic on 2m. new one-way record On 2 October, Ed Lesnichy, RU6LA, set up his station at the Machta locate, where he was able to erect an effective forward pass supported by a 130m column. The purpose was to run a radio beacon transmission in the hope that it could be received in ZL. In the consequence, his 120-second dot-length QRS CW signal was well received by Bob, ZL2CA, at a distance of 16,473km and traces were picked up by Andrew ZL2BBJ at 16,477km. This extends the previous one-way record from Europe to Oceania of 16,438km, held by RN6BN. Ed s ERP was about 15W, so he had a bite of an advantage over the humble one-watters ( if we re lucky ! ) over here. LF TRANS-ATLANTIC THE OTHER WAY Some of the US stations who were listening for EU signals death winter are now transmitting under depart 5 rules. Most successful in crossing the Atlantic so far is John Andrews, W1TAG, whose beacon, WD2XES, on kilohertz has been regularly received by Hartmut Wolff and others. John is in Holden Massachusetts, lone about 100km from the seashore and Hartmut is about Wolfsburg in Northern Germany, a little far inland. The outdistance between them is 5,957km. other beacons to listen for are VO1NA on kilohertz ( normally receivable in the UK ), VE7TIL on, WD2XDW on and WD2XFX on kilohertz. WD2XDW is operated by Laurence Howell, KL1X/5, who is now located near Bartlesville in Oklahoma. This beacon has been widely received around the USA at distances of over 3000km. Like John Andrews, Laurence uses a iteration aerial to great impression. These are not wide used for transmitting in Europe, but possibly we should give them a little more consideration ? Laurence s rectangular adaptation is 130ft long with the top at about 60ft and the bed at 9ft from the labor, with upright ( tree ) supports some 55 65ft high. The original was constructed from 6AWG copper wire and has since been augmented buy a second loop of 700-strand Litz wire. This follows the like class as the beginning and is in twin with it. The advantage of a loop aeriform is that it can be supported by the branches of trees without the electrostatic losses normally experienced with short circuit Marconis. Voltages may be lower, but currents are gamey, so the cable must be chummy and the tune capacitors must stand tens of amps. Laurence uses about 11nF of Sangamo doorknob mica types in his ATU, and suggests searching Ebay for desirable ones. Fine tune is by a vacuum variable. With 200W from his home brew sender, Larry Kayser, VA3LK, dumb key New one-way Europe-to- Oceania record Trans-Atlantic signals from the USA More CW operation requested on LF to increase the numbers of newcomers to the band. Laurence has measured 13A of forward pass stream. One disadvantage of a loop is that it has a figure of eight radiation practice with nulls broadside to it. Laurence has plotted the radiotherapy convention from his system and has found the deep nulls to be about 30 across-the-board. This would be an important agent for those considering a air closed circuit, are your trees in the right place ? CW, ANYONE ? I have noticed, over the past few months, that conventional CW bodily process has dropped to a low tied. Newcomers to the ring need a few commodity audible signals to encourage them and a question I am often asked is When is there activity on the band ?. I normally say that Sunday mornings are a good time to hear CW, but recently this hasn t been true. So how about a snatch of key-bashing on a Sunday, to encourage listeners without computers in the trail ? See you there ! NEW LF BOOK The RSGB has recently published a new bible by Mike Dennison, G3XDV, entitled LF Today a Guide to Success on 136kHz. It builds upon Peter Dodd s Low Frequency Experimenter mho Handbook, and is truly a mini-radio Communication Handbook, concentrating simply on LF, having chapters on receivers, antennas, transmitters, measurement, etc. The propagation chapter is written by Alan Melia, G3NYK, and is full of interesting information and there are even some of my designs in the transmitters chapter ! LF Today is available from the RSGB at to members. This is ZL2CA second Argo trace showing RU quite distinctly on the leave. RadCom December 
76 What randomness on offer ? Go to any one of our three branches and take advantage of our modern Buy now, Pay Later dodge. It s available on most main-line transceivers and receivers. You pay absolutely nothing for 12 months. It is your luck to buy that dream radio now and keep your cash for 12-months where it can earn a few percentage in the serve. And it is all so fuss-free. How does it Work ? You select the product you wish to purchase, sign an agreement class that in twelve calendar month s time gives you the choice of paying the full purchase price with no interest or penalty, or opting to spread payments over a three year period on an interest behave basis. ( see below for details ). The option is yours. If you choose to pay up the full price 12-months after purchase date, you will have enjoyed an matter to loose loan with no interest charges. much cheaper than using your recognition card ! How to Apply Either call or call into one of our stores where we take some personal details and complete your application on-line. For in-store customers we can do it while you wait. For mail orderliness customers we can get acceptance within the hour and send the forms out the same day for signing. store customers take the goods aside immediately, whilst mail order customers goods are sent out the same day as we receive the signed forms back. It is all very easy and remember, you pay nothing if you settle the agreement within twelve months ! Important. When visiting a shop, please bring two pieces of identity eg. driving license, recent utility circular, passport, late bank statement ( all to show your address ), or citation tease. Conditions Apply This put up is subjugate to condition. Full details together with an exercise are shown below. Conditions may change from time to clock. Please investigate for latest data. BUY NOW PAY LATER AT ALL THREE STORES Mail order : like Day Despatch Shop : Walk away With It Jaycee Electronics, Glenrothes. tel : Or Use Our Same Day Mail Order Despatch Service Lowe Electronics, Matlock. tel : Waters & Stanton, Hockley. tel : % APR TYPICAL EXAMPLE OF BUY NOW PAY LATER. CASH PRICE 600. PAY NO DEPOSIT AND PAY THE FULL AMOUNT 12 MONTH S LATER. PAY NO INTEREST. OR AFTER TWELVE MONTHS 29.8 % APR REPAY PER MONTH FOR 36 MONTHS. TOTAL AMOUNT DUE INTEREST IS CALCULATED FROM THE DATE OF THE AGREEMENT. ALL FINANCE SUBJECT TO STATUS WRITTEN QUOTATION ON REQUEST. I wanted a new radio. I would normally have used my credit menu. But then I looked at the interest charge – ouch ! ! W & S came to the rescue with their Buy-now Pay-later system. I walked away with my dream radio, got the deduction price, and nothing to pay for twelve months. I plan to settle the placard in full in twelve months time, indeed avoiding any interest charge. immediately that is a batch ! 
77 Rev George Dobbs, G3RJV QRP St Aidan second Vicarage, 498 Manchester Road, Rochdale, Lancs OL11 3HE. QRP R ick Leach, M1RAL, on the G QRP Internet List, excitedly reported on his first trans- Atlantic 5W SSB liaison from his give localization using a Yaesu FT- 817 with a W3EDP telegram antenna mounted indoors in the loft space. VE3AT ( 20m ) was close followed by K3WW ( 20m ). He then went on to his first contact with Japan, and with that ultimately achieving 1000 miles per Watt on 5W SSB. not one but two contacts ; JA9SCB/P ( 15m ), a difficult contact, followed a few minutes late by JA3YBK ( 15m ), who came back to Rick after one call. I asked Rick for a small background information on his QRP operation and he replied saying, Where I presently live, I have restrictions on where I can site external television and satellite dishes. My free-base antenna, therefore, have always been indoors, normally in the loft or occasionally a random duration of wire thrown from a bedroom window to nearby fence post or tree. While it may sound limit, this indoor W3EDP has served me extremely well. To date, my most memorable contact was with John, K2VV, in Missouri, USA, using good 5W to span the Atlantic for the first time. This was at a forecast distance of 4085 miles and was achieved using an indoor random cable antenna. Contact was besides established with Mario, 5N6EAM, in Nigeria at a outdistance of 3257 miles and was achieved using a Yaesu FT- 817 and Miracle Whip antenna located indoors, with Flavio, IK2IQD, in northerly Italy act as the controlling station. Most recently, during a Worked All Europe contest, touch was made with Akihiro, JA9SCB, and Yutaka, JA3YBK, in Japan, again using just 5W into a W3EDP electrify antenna erected in the roof space of my house. bipartite SSB QRP is besides possible besides, and just goes to show what can be achieved running low might, with a little solitaire and doggedness throw in for good quantify. QRP is not constantly easy, but then again, if it was easy, would it be deserving doing ? bill : The W3EDP Antenna is an end-fed 84ft wire which is normally fed using a poise tuner against a counterweight wire of 17ft for 80/40/30m and 6.5ft for 20m and above. The Miracle Whip is a commercial, collected, all-band ( 3.5 to 460MHz ) 57in telescopic whip antenna with integrate radio receiver for RadCom December 2004 receive and air that mounts immediately on to the FT-817 antenna socket. No preferably had the final edition of this column appeared, with data on some QRP contacts, than I received an from Paul, G7RSG, about his first-ever QRP contacts on an HF band. Today ( 17 March 2004 ) sitting on Shoreham beach ( Sussex ) using merely 5W from my FT-817, I replied to two CQ calls on 20m SSB, and got responses from both S51GL, Slovenia, and EA3FEB, Barcelona, one being a 5/4 report with QRN at his end. I about fell over in jolt as these were my inaugural QRP contacts on HF. For transmittance, I was using a compress, tunable worst made by bhi called the Wonder Wand ( an antenna I often use for reception at home, as it besides seems to have remarkable receive performance ) with the radio powered from a 12A 12V, sealed run acid barrage. N0LX/MM QRP WORLD RECORD ATTEMPT Jake Groenhof, N0LX, is an avid QRP portable operator who likes an unusual challenge [ understand RadCom, April 2004, p85 Ed. ]. Just for fun, on Saturday, 14 August at 1500UTC, Jake was at 13,800ft ( 4206m ) altitude in his 8ft row boat, attempting the highest-ever HF nautical mobile operation. The weather cooperated and the bands were in good form. He was joined by Eric, KG0HO, and Bruce, KG0SH, who helped Jake get the boat and gear to the water and to witness the event. The water was a reservoir, 40 miles Jake, N0LX, 40 miles west of Denver, at 13,800ft altitude see N0LX/MM QRP World Record Attempt. west of Denver, Colorado and just below the summit of Mount Evans. Built to supply body of water to a restaurant that was once at the top of the mountain, it is no longer in use. The station was an FT-817 feed a home brew matching whole and coilloaded half-wave upright supported with a 20ft fish pole. In all, 14 contacts were made to eight states, including Iowa, Missouri, Michigan, Illinois, Ohio, New Hampshire, Virginia and Colorado. Later, Eric and Jake hiked to the top of the batch to see the acme and try some pedestrian mobile. Jake said he made some dainty contacts including Florida and Alberta, Canada. THE G QRP CLUB WINTER SPORTS The G QRP Club Winter Sports is one of the most democratic QRP operating events. Each class between Boxing Day ( 26 December ) and New Year south Day ( 1 January ) the club invites any operators to join in a QRP QSO Party using 5W of RF output or less. The operating takes place on and around the International QRP calling frequencies. These are : for CW 1843, 3560, 7030, 10106, 14060, and 28060kHz ; for SSB 3690, 7090, 14285, and khz The Winter Sports is not a contest, sol 5NN BK exchanges are not heard, and participants frequently linger over interesting contacts. It is usual for operators to exchange their G QRP Club membership number, if they have one. The consequence does provide an opportunity for operators who do not normally use depleted power to turn down their baron to 5W or less and see what can be done. Those taking character are invited to submit logs and comments to the G QRP Club Communications Manager, Peter Barville G3XJS, 40 Watchet Lane, Holmer Green, High Wycombe. Buckinghamshire HP15 6UG The G4DQP Trophy is awarded to the station making the best overall contribution, which may not be the station with the most contacts or working the most DX. therefore turn down the might and have a test at this popular event. It is one of the few times I have heard QRO stations complaining about QRM from QRP stations ! 77 
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79 By Norman Fitch, G3FPK VHF/UHF 40 Eskdale Gardens, Purley, Surrey CR8 1EZ. VHF/UHF A broad VHF/UHF column, with reports on some excellent tropospheric generation, making improvements to the sensitivity of the FT-847 on 4m, an mathematical process from the Isle of Man, and much more. T he October edition of the UK Six Metre Group s quarterly Journal Six News runs to 51 A5 pages and, as common, includes some fine articles. propagation at 50MHz is a capture subject and the 23-page sport article is by Jim Kennedy, KH6/K6MIO, who discusses 50MHz Long Path Propagation. This is one of the most comprehensive treatises I ve seen on this subject. Dave Toombs sulfur, G8FXM, Digital Bits column discusses Spectran, which is bundled with the latest WSJT translation and Dave Edwards, G7RAU, writes about his excellent Live MUF Calculator. Clive Davies s, G4FVP, What s on Six column is substantive reading, excessively. The back shroud shows a mental picture of the 40 people who attended G3WOS s 6m barbecue on 7 August. Chris Deacon, G4IFX, edits Six News and his savoir-faire is The fall version of the quarterly publication VHF Communications, edited by Andy Barter, G8ATD, starts with Carl Lodström randomness, SM6MOM, well illustrate article on The noble art of piping baron to an antenna. Gunthard Kraus, DG8GB, discusses the SonnetLite 9.51 in a 23-page article and there is his common Internet Treasure Trove contribution. VHF Communications is published by KM Publications, 63 Ringwood Road, Luton, LU2 7BG and there is a web site – see Web search RadCom December 2004 IMPROVEMENTS The comments in the October VHF/UHF about the telephone receiver performance of the Yaesu FT-847 transceiver on 4m brought a very helpful note from Rodney Fry, G3NDI, who bought one last year. He besides found that its sensitivity was quite inadequate. He writes, It is quite noteworthy what a little searching with Google on the web will turn up, such as a total of discussion forums related to the FT-847. He recommends Peter Pfisterer randomness, DH1NGP, Supercontrol web site, which offers some frequently asked questions ( FAQs ) on the fishing gear, in particular comments on the frequency accuracy and how to make a minor correction, and the Yaesu FT-847 Forum, which tackles frequency adjustment. The 4m Forum on the 70MHz web site is highly recommend. Go to Links and suction stop on Forum, then Equipment and last the item The FT-847 on 4 metres which has the identical utilitarian gossip on the sensitivity alteration via a hidden menu. He continues, You need to be agile with fingers to hold all the microphone buttons down while switching on the rig. I adjusted my carriage to the maximal addition – it was set at 53, whatever that was supposed to mean – and it seems quite reasonable now. It would be interesting to know if anyone with entree to the proper measurement equipment could confirm the improvement and how it compares to the bands either side. See vane search for details. ANTENNA DESIGN Derek Hilleard, G4CQM, has changed his web site covering his antenna data The Wrexham ARS group s Land Rover anterior to the GB4IOM DXpedition. – experience Web search. There are designs for VHF and UHF antennas of assorted boom lengths giving element lengths and spacings together with performance plots, cable passing information, etc. He can besides supply bits and pieces for manque constructors. GD DXPEDITION The Wrexham ARS mounted a major DXpedition to the Isle of Man as GB4IOM over the 1-8 September period. In the photograph, the group s Land Rover is shown on the docks at Heysham anterior to the start of the DXpedition. On the roof scud are 240ft of mast segment and two small 30ft masts. On the trailer are the 40ft loom, a 7.5kW generator and diverse HF and VHF antennas. All the station gear is inside the vehicle. Mike Bryant, GW6NLP, sent some details of the VHF operation on 2m, comprising an FT- 225RD, 25W to a 19-ele Yagi 50ft ASL, and a TS-2000, 100W to a 4-ele Quad 35ft ASL on 6m. operation was from a disused Coast Guard lookout column at Scarlett Point, 1.5 miles south of Castletown. Their log shows 59 QSOs with stations in DL, EI, G, GI, GM and GW during the RSGB 2m Trophy Contest on the fifth. In an Es opening on 6m on the 5th 17 contacts are listed with stations in EI, G, GW, I2, I4, OH and SM. A fully report is on the comprehensive examination web site – attend Web search. SOLAR AND GEOMAGNETIC ACTIVITY The decline in solar activity continues and in the 30 days to 12 October the 10.7cm solar flux averaged 94.8 units, a significant fall on the previous 30- day value. The maximal was 118 on 13 September and the minimum was 87 on 11 October. The SESC sunspot number was zero on 10 and 11 October, the maximal consider was 80 on 16 September and only nine new regions were recorded. The middle latitude A-index at Fredericksburg was in single figures on 23 days, dropping to just 2 on six days with the utmost of 17 occurring on 14 September. METEOR SCATTER Going back to the Perseids in August, G4DBL tried FSK441 mood on 2m for the first gear prison term and worked a fairly few Europeans in respective grids completing some QSOs in about 8mins. The Geminids is one of the major meteor showers in the calendar and the OH5IY plan suggests it should peak around 2220 on 13 December with a zenithal hourly rate ( ZHR ) of 120. The accuracy of this prediction is ±6 hours and the beaming is above a mid-uk horizon from 1630, through midnight, to At the meter of utmost, the north/south and northeast/southwest paths are well. The reflection efficiency is above half the 79 80 VHF/UHF MOONBOUNCE Howard Ling, G4CCH ( IO93 ), was QRV on 23cm in the first leg of the ARRL International EME Competition over the 9/10 October weekend and reports that conditions and action on the first day were dear. On the Sunday action was lower, specially from Japan – the day of the japanese Formula 1 Grand Prix – and conditions seemed poor. Overall he completed 49 contacts with 31 multipliers and WB5AFY was the entirely modern station, or initial ( # ) worked. Tim Stanley, G4DBL ( IO91 ), runs 300W to a 17-ele Yagi 11m AGL on 2m and has completed his first EME QSOs using JT65b. These were with I2FAK, W5UN and W8CNL on 22 and 23 September. The pursuit items are taken from the October topic of the 432 and Above EME News edited by Al Katz, K2UYH, who reports that 70cm activity in September was manner down. Doug McArthur, VK3UM, writes, After 20 years of active EME operate this last weekend must rank as the worst I can recall. Peter Blair, G3LTF ( IO91 ), was the exclusive british contributor to this edition and wrote about the August EME Conference in Trenton, which he attended. He was a snatch disappoint that there weren thymine more attendees both at the consequence and the forum, which latter was held on the Sunday and by which prison term a number of people had left. He was QRV in the italian contest but high winds restricted his operation. On 23cm on 11 September he completed with G4CCH, OZ6OL, GW3XYW, K9SLQ, IK2MMB, K0YW, W7BBM, VA7MM and WA6PY. future day on 70cm he worked SP6KLW, DL9KR and S52CW when Faraday rotation was 90 and fairly shrill. On 11 September he completed with OH6NVQ on 13cm and is concentrating on generating higher world power on the band. The 4/5 December weekend sees the final examination leg of the ARRL contest, which is for the MHz bands. London latitude stations will have about 26.4 hours of Moon time. The decline varies from to +7.35, the 144/432MHz sky temperature range is 217/16K to 239/18K and the signal abasement, referred to perigee, varies from -1.59dB to -1.31dB. The Sun outgrowth at Saturday midnight is -90. utmost for about a day but there are reasonable reflections for a few days before maximal. however, this is an asymmetrical exhibitor and reflections drop off quite quickly after utmost. The end shower of the year is the Ursids, which should peak around 0800 on 22 December ±3 hours. This shower is available all day and the reflection efficiency is above one-half that at maximum for 14 hours. The ZHR is about 12 and at maximum the east/west path is the best as it is for all the time, while the north/south path international relations and security network t peculiarly good with dropouts at 0900 and BAND REPORTS 50MHz There is very small to report on 6m this time now that the summer Es season is over although Bryn Llewellyn, G4DEZ ( JO03 ), worked quite a draw of italian stations in the evenings of 4 and 5 October. Ted Collins sulfur, G4UPS ( IO81 ), report for September is a one-page one of completely nothing natural process in contrast to this clock last class. Derek, G8TOK ( JO01 ), writes, At 1543 on 19 August testing the stunning liquidator on my new IC-7800, I about immediately work UT7UV ( KO50FK ) for a new grid and a identical respectable distance for the clock of year ( 2116km ). Kevin Jackson, M0XLT ( IO83 ), found a brief Es hatchway from 1300 on 4 October during which he copied beacons CT0SIX and IK5ZUL at S5 but CQ calls produced no takers. He besides heard EI3IO in beacon modality on MHz via tropo scatter. On 11 October, , radio beacon SR9FHA ( KO09 ) on MHz was up to S7 but again CQ calls brought no replies. eastern european television video carriers were audible, the strongest being on MHz at up to S9. 70MHz G8TOK writes that the early on September tropo open was the best he can always remember but that, despite appeals on the cluster, few stations thought to listen on the band. The GB3ANG Angus beacon was a genuine S9 for about 24 hours and was louder than the more local ones. At 2202 on the 7th Derek worked GM4AFF ( IO86 ), who sounded like a local station, in astonishing conditions and it was a fresh grid. 144MHz The independent topic this time is the excellent tropo period at the beginning of September that was just starting as the November VHF/UHF was being written. Geoff Grayer, G3NAQ ( IO91 ), lists 15 stations over 700km worked during the even of the 7th, ODX being OZ1EP ( JO55 ) at 1002km. other DX included DJ8MS ( JO63/951km ) and OZ1LFA ( JO54/943km ). On the next night action was lower and most contacts were with stations km distant, ODX being OK1VZP/P and OK1THE/P ( JO60 ) at 1010km. G4DBL was QRV in the UKAC on the 7th and Tim made 138 scoring SSB QSOs, ODX being SP2FAV ( JO94 ) at 1393km. With 40 multipliers he ended up with a score of 5520 points, not a bad 2.5 hours function. In his comments section he wrote, What a blast. Tropo generation very good. Working DX to the east about around-the-clock ; decided to look north near the end, fair to get some multipliers. Myke Oldham, G6DDQ/P ( IO84 ), was QRV for the Summits on the Air ( SOTA ) event on 8 September from acme NP-030 and in 75min from 0900 worked 14 SSB stations in DL, ON and PE, ODX being DF3RU ( JN59 ) at 1094km. He was entirely running 2.5W to a 3-ele Yagi 3m AGL. Bob Harrison, G8HGN ( JO01 ), worked HB9FAP ( JN46 ) at 2056 on 6 September in what he thought were rather strange conditions with a impregnable cinch blow from the northeastern across the path to Switzerland and which normally kills propagation in that steering. He worked OK2PMU ( JN99 ) at 1265km at He got up early next dawn but there wasn thymine much natural process until around 1500 after which he contacted DL1XAQ/P ( JO43 ), OE5XBL ( JN68 ) and OE2CAL ( JN67 ). In the UKAC that evening he made 46 QSOs with stations in 11 countries and 28 grids for a claim score of 1288 points, ODX being OE2WPO/2 ( JN67 ) at 1002km. By the future day the conditions were declining but a CQ call at 1902 resulted in contacts with HB9SJV ( JN36 ) and DF1VW ( JN39 ). Jamie Ashford, GW7SMV ( IO81 ), lists 51 QSOs made between 1719 on the 7th and 0648 on the 8th. OE2CAL and ODX SP3MGM ( JO73 ) at 1259km were two raw countries on tropo. other contacts over 1000km were with OZ6ABA ( JO57 ), DL0BWS ( JO64 ), DK7OM and DG6SYL ( JO53 ), DJ8MS, OK1RI ( JO60 ), DK3WG ( JO72 ), DF1CF ( JN57 ) and DH2UAK ( JO71 ). Dave Hewitt operated as GW8ZRE/P ( IO83JF ) in the UKAC running 80W to a 7-ele ZL Special antenna and completed 153 scoring QSOs with 42 multipliers for a claim grade of 6426 points. Ten countries were worked with the antenna pointing to the east, ODX was DL5YEE ( JN42 ) at 1502km and he reckons that it was the best hemorrhagic fever contest he has ever taken contribution in. 42 grids in 2.5 hours can t be regretful. Steve Bunting, M0BPQ was on holiday in Yorkshire for the tropo open in early September and was QRV for part of the UKAC on the 7th completing 54 QSOs, ODX being SP6RGB ( JO71 ) at 1134km. Robin Burrows- Ellis, M1DUD ( JO02 ), was QRV in the Nordic Activity Contest ( NAC ) on 7 September running just 5W to a 5-ele Yagi 6m AGL in the best tropo afford for a long time. He had never heard any GMs on the band public treasury this night when he worked GM3YOG/P ( IO85 ), GM4YXI ( IO87 ) and GM0HTT ( IO89 ). Steve Burrows, M5BXB ( IO91 ), managed 124 QSOs on the 7th using 400W to a 9-ele Yagi 15m AGL. Countries worked were DL, F, G, HB9, LA, ON, OZ, PA, SM and SP in 36 grids of which JO46, 56, 64, 83, 92 and 93 were new. ODX was SP3VSC ( JO92 ) at 1258km. Within seven months of getting his classify A call Chris Ruddy, MM0KOS ( IO85 ), has notched up 23 DXCC entities and 86 grids on the band using 100W and a 9-ele yagi. He has used FSK441 and JT65 modes and has besides completed three EME contacts. 430MHz After the Trophy Contest on 2m on 5 September G8HGN put out a CQ call on 70cm and worked OZ8AFC ( JO45 ) at 2119 followed by SM7FMX ( JO65 ) both contacts in QSB. After the 2m UKAC on the 7th, Bob fired up on 70cm just after midnight and worked GI4ATZ ( IO74 ) and GI4SNA ( IO64 ), the latter a modern grid number 77. During the even of the 8th he contacted DF1VW ( JN39 ). During a french contest on 19 September M0BPQ, running 40W to a 19-ele yagi at 25ft AGL, worked F4CKV/P ( JN16 ), F8ALX* ( JN06 ) and F5OAU/P ( JN27 ). In the SOTA event on 8 September G6DDQ contacted DJ6JJ and DK9TF ( JO31 ) and PA3FTX ( JO21 ). Myke was running 2.5W to the 3-ele 2m Yagi, then the batteries in his FT-817 died. 80 December 2004 RadCom 
81 VHF/UHF 1296MHz Towards the end of the IARU Contest on 3 October M0BPQ contacted DJ5BV ( JO30 ), PA0S ( JO21 ) and PI4Z ( JO11 ). Steve was using 8W and a 35- ele Yagi and the DJ was a raw nation on the band and ODX at 510km. G8TOK worked OZ1CTZ ( JO46 ) on 2 September and on the 7th GM4LBV ( IO86 ), was the first base always GM that Derek had heard on the set, so a newly area. SIGN OFF Nice to have had some decent tropo to report for a change then let s hope we get another fall raise. Thanks to Neil Clarke, G0CAS, for the August topic of Sun Mag. The deadline for the February edition is very early, 7 December and for March, when I ll need your final scores for the annual table in its stage form, it s 11 January. My call answer and facsimile machine is on, although it s ages since anyone used it, and my CompuServe ID is g3fpk. I hope you all have a nice Christmas and might find some meter during the festivities to participate in the Christmas Cumulatives. WEB SEARCH VHF Communications : DH1NGP : FT-847 forum : 4m web site : G4CQM antennas : GB4IOM : locator SQUARES TABLE Starting date : Callsign 50MHz 70MHz 144MHz 430MHz 1296MHz total G0JHC G3IMV* G0FYD G4DEZ GW7SMV MU0FAL GW3HWR G4OBK G4VPD M5BXB GW3LEW G8TOK G6TTL GM4VVX G8HGN G3IKR M1DUD G3FIJ M3CVN G0ISW EA7IT G4APJ M0XLT M5MUF G4FUJ MM1FEO G3FPK E1GUA G4YTL G3XDY G8RWG *Silent key. No satellite, repeating firearm or mailboat radio QSOs. If no updates received for a year entries will be deleted. Band of the calendar month 50MHz. next deadline is 7 December. Book review HIJACKING ENIGMA THE INSIDER S TALE By Christine Large, Director of Bletchley Park Trust Reviewed by RSGB Staff Are you an Enigma aficionado, who devours all information on the subject, or do you like a well detective floor, peculiarly one that is true ? Whichever it is, you will surely like Hijacking Enigma, a book detailing the late larceny of the celebrated Abwehr Enigma machine ( of which there are thought to be alone two or three in the universe ) from Bletchley Park mansion on Saturday April The four-rotor machine, serial issue G312, had been used by the Abwehr, Germany s élite military intelligence force, and was the jewel in Bletchley Park s peak. The book is written by Christine Large, the Director of Bletchley Park Trust who, despite her name, is “ bantam, a Geordie with a spine of sword, ” according to The Times. Her reserve contains two stories the larceny of G312, and some of the history of the Enigma machine, dating back to 1918, when its inventor intended it to be used for secure transactions between banks. It follows the machine to its first capture by the Allies and its use to shorten WWII. It is, possibly intelligibly, the more holocene larceny that has the greater impact on a 21st-century proofreader, as it is mod history, written by one who was an integral part of it. Parts of the floor distillery remain unknown but, once the machine had been stolen, dealings with Christine Large were restricted to a middle-man who said he was acting on behalf of a third base party in India, and wanted 25,000 for its render. The byzantine dealings were apt, virtually impossible to trace, and very frustrating for Bletchley Park and the police. The middle-man, Dennis Yates, was adamant that he was going to return it but was, in turn, being blackmailed by his master, the intended buyer. How Yates, a erstwhile extremity of the RSGB, was finally captured, after anonymously returning G312 ( less three rotors ) to the improbable personage of Jeremy Paxman at the BBC, is something you can read for yourself. The three rotors were finally returned. Depending upon your inclination, you can read the koran in toto and enjoy both latitude adventures, or you can read individual alternate chapters, one narrative at a time. It is an excellent script, a valuable accession to the growing body of data about Enigma, past and present. highjacking ENIGMA THE INSIDER S TALE By Christine Large, Director of Bletchley Park Trust John Wiley, pages, 128 adam 198mm ISBN Member mho monetary value 6.79 ( non-members price 7.99 ) RadCom December 82 
83 By Andy Cook, G4PIQ CONTEST FEATURE VHF Contest Committee Chairman, Knaves Acre, Brantham Hill, Brantham, Manningtree CO11 1TA. VHF NFD 2004 The joint Flight Refuelling ARS and Bracknell ARC post by nox. be in different sections on different bands according to the level of hardware that they have available on that band. This class, for the first fourth dimension, groups did not have to pre-register to take separate and be tabulated in the results ; pre-registration was only necessity in order to be eligible for awards, and this added a short flexibility for some last-minute planners. The poor people weather meant that tropo conditions were poor on all bands and when combined with the fact that Sporadic E propagation was very hapless on 6m, and non-existent on 4m and surely 2m this intend that groups away from the larger population centres had a particularly hard clock this year. One non-entrant, the Lerwick Radio Club from Shetland, deserves a mention this year. They made a valiant undertake become on for VHF NFD, but with such poor conditions they were very precisely excessively far union to be able to make any sort of impression on the bands without identical large hardware. photograph : PAUL MARSH, M0EYT W RadCom December 2004 hat will in truth stick in people second minds about VHF NFD 2004 was the shock weather peculiarly on the Saturday and during set-up clock on the Friday. The Newbury Club, G5XV/P, suffered indeed much from the wind that the tent collapsed and they had to operate from cars for the first three hours. The Stevenage & DARS, G3SAD/P, damaged their mast and antenna for 23cm with the high winds and had to retract the antenna on the other bands. inactive rain meant that the Cockenzie & District ARC was efficaciously two hours late starting on 2m and 6m since they couldn thyroxine learn anything over the S9 noise level and a total of other groups complained of inactive rain arsenic well the Warrington team said it was the worst that they had ever known. The De Montfort University RS suffered a major catastrophe as their toilet blew away in the center of the night but – merely to prove that a little hiccup like this can t set a acme team off its course they did still go on to win the Restricted Section. The one up point of the measly weather was that at least it was a serve for those groups like GM3TAL / G3SHK who used wind baron for battery charge ! In malice of the inadequate weather, overall entries are lone fractionally down on last year, and a good number of groups who registered didn t show up on the day ; presumably the weather had some impact on that ! There s a continuing motivate of entrants out of the Open section, into the more club-friendly sections which require less hardware. This class, increase in the tactical Mix & Match section was particularly strong. This part allows groups to 6m The lack of traditional european Sporadic E this year on 6m intend that groups made the majority of their QSOs on tropo. however, for those staying alarm and in the right places, there was a little excellent DX around, with 5T5SN in Mauritania forming the best DX for a number of stations, and three groups, one in Cornwall, one in Devon and one in southern Scotland, catching an opening to the east coast of the USA. The physically larger antennas much used on 6m mean that the weather probably played more havoc here than anywhere else. The Clifton ARS, G5YC/P, left out a critical encouraging couple in their big 7-element Yagi which gave it a 20º downtilt, but by the time that the operators thought about fixing it, the weave was blowing far excessively hard for anyone to fancy taking the mast down. The Reigate and Crawley clubs had big plans to use four antennas on the band, but the weather forced them back to merely the one Yagi. On the indoor presence, open section winners the Colchester Contest Group, G0VHF/P, lost their commercial 6m PA in a powderpuff of smoke after two hours and had to run the stay of the contest on 100W. 83 
84 CONTEST FEATURE Cray Valley RS and Addiscombe Radio Club combined forces to become the Kentish Hills Contest Group. They are most grateful to Icom ( UK ) who loaned them an IC-7400 transceiver to use on 144MHz when the radio they were going to use became unavailable. 4m sporadic E propagation is actually the frost on the cake – or a interracial blessing when it occurs on 4m, since it often brings with it lots of eastern european circulate station QRM, so its absence this year was not arsenic luminary as on 6m. once again, our loyalist entrant from the far north, Clive O Hennessy, GM4VVX, was operational, this time with a singleband 4m entrance, but lone managed to drag five QSOs out of the mire with his 10W. however, he did hear another five stations who couldn thyroxine be raised. In hurt of losing the first hour of the contest due to a reversion polarity problem with the transverter, the Lothians RS, GM3HAM/P, went on to win the isthmus in the open section. Nick Garbett randomness, M1DDD, one-man band entrance deserves some special mention, gaining runner-up position in the abject might section on 4m. 2m The poor conditions meant that even 2m was a bit of a slug this class with some of the best DX being worked down to the South of France, but about nothing over 1000km. MM0CPS/P had a very hard time on 2m and couldn t number out where an intermittent senior high school SWR trouble was coming from until the end of the contest when they found that the power rail-splitter had come apart internally. Clifton ARS, M0BPQ/P, had a trying time during set-up, breaking a raising rope on their 30m tugboat and an antenna in the work as the tugboat collapsed from 25m to 6m in approximately two seconds a chilling here and now. thankfully no one was hurt, but they did have to run the contest with a small depleted Yagi. In malice of this they still worked OL8R at 888km as their best DX. They weren t the only group to suffer this problem this year, so it s well worth checking out the status of the ropes on your loom before the contest. The Bristol CG besides had both of their 2m antennas astir and down more frequently than they cared to remember to fix bad lengths of heliax and break baluns. however, as they said, at least the linear observe on going. 70cm The poor conditions inevitably make 70cm rather slow going in places away from the bulk of the bodily process and a number of groups questioned whether the band was actually worth the effort. however, for at least one of those teams, 70cm actually ended up contributing more to their score than any early ring. Another group predicted that 70cm may be a little hushed, so they made certain that station was located in the food tent so that at least the operators would be kept well fueled. Cambridge & DARC, M1KTA/P, took the effective measuring stick of putting both the power and pre amplifiers for 432MHz at the exceed of the mast. unfortunately the baron supply to them failed and it took some clock for them to notice. The South Birmingham Club, G8OHM/P, lost a rotator just before the start of the contest, and a pre-amp on Sunday dawn. Computers besides got affected by the bad weather, or possibly it was merely the effects of a portable contest. The Kentish Hills CG suffered when the moisture weather got a little excessively close to one of the computers causing a number of crashes followed by the exhalation of a monitor and both the Chesham & Maidenhead and the Cambridge teams suffered hard magnetic disk crashes on one band or another fall back over half their QSOs on those slots. It may be honest-to-god engineering, but it randomness well worth setting your logging package to sporadically save the log to a diskette magnetic disk. 23cm natural process on 1296MHz has inevitably suffered since we introduced assorted options for teams not to operate on the band. This year, however, in malice of the poor conditions, the numeral of stations entering here actually rose slenderly. possibly this was due to the fact that a phone number of stations in the candid section took advantage of a new predominate allowing them to take all five bands out if they wanted to and to have the best four to count to their overall score. G0VHF/P put in a great score on the ring, netting over 100 QSOs, with best DX into Berlin. not many equipment problems were reported, although Warrington CG lost the valve in their PA character way through the contest once again and had to complete the contest barefooted on 8W. however, they however won the band in the Low Power section. FUTURE RULES ? A number of groups commented that what they find hard about NFD is getting enough antenna hardware, tents, generator power and people together to operate all bands simultaneously. Should we think about a section where groups have the choice to operate bands one by one preferably than concurrently ? Your comments on this would be welcome. however, it s besides worth pointing out that the Low Power section, which is already slimmed toss off to 16 hours and three bands, has once again been won by a team consist of only two operators. A non-concurrent section would distinctly besides attract single operators and this class Nick Garbett, M1DDD, put in a unmarried hustler entry to the low power section end in a estimable mid-table stead using just a compromise log-periodic antenna for all bands. The arrival on the market of some small and very cheap generators ( my local DIY shop had 700VA models for 65 last week ) is making portable contesting with moderate power even more practical than it used to be. WINNERS The winners in each of the sections were very clear this year. In the Open Section, the first and second placings from last year were reversed, with the Colchester club winning out over the Windmill Contest Group and taking the Surrey Trophy. The Lothians RS, operating from southwest Scotland, put in a great effort and only narrowly missed the runner-up time slot from a site so far north, and once again take away the Tartan Trophy by way of consolation. Just as last class, in the Restricted Section, the De Montfort University RS ended up winning the Martlesham trophy from the Lagan Valley ARS, but the Northern Ireland team have closed the margin this class with a much stronger performance on 6m. The Highland CG take the Cockenzie Quaich as the leading scottish team in this section. In the Low Power Section, the Warrington CG decimated the contest to win the incision conclusively, with the Cambridge & DARS A team coming in second. Cambridge actually fielded low might stations on all five bands in the class of an A and a B team. The scots Trophy goes to the two-man team of GM3TAL & G3SHK. The tactical Mix & Match department saw the same placings as in 2003 at the top of the table, with Telford & DARS extending its run a little over the Surrey Radio Contact Club and winning the G5BY trophy. 84 December 2004 RadCom 
85 CONTEST FEATURE PHOTO : JOHN, G4ZTR. VHF NFD 2004 OPEN SECTION Pos Group Name Loc Total 1 Colchester RA 01PU Windmill CG 01LD Lothians RS 74WV Bracknell ARC & FR ARS 80ST Reigate ATS & Crawley ARC 01OC Cockenzie & Port Seton ARC 85RU Chesham & Maidenhead 91QS Stevenage & DARS 91TW Harlow & DARS 01BR Mid Cheshire ARS 83QE Wythall CG 92BJ Dorking & DRS 91TE Edgware & DARS 91VO RESTRICTED SECTION Pos Group Name Loc Total 1 De Montfort University RS 02ST Lagan Valley ARS 74AI South Birmingham RS 82XJ Newbury & DARS 91GI RADARS 83VP Basingstoke ARC 91KG Highland CG 75DH Leicester RS 92IO Andrew Warburton 84KF Farnborough & DARS 91OG Mex. & DARS + S Yorks ARS93HO West Brom Central RC ( A ) 92BX abject POWER SECTION Pos Group Name Loc Total 1 Warrington CG 93AD Cambridge & DARS ( A ) 02CE Two Counties CG ( A ) 92LJ GM3TAL & G3SHK 75IU Goole R & ES 93PV Nick Garbett 93AE Sutton Coldfield RS 92FM Mid Sussex ARS 90WV Cambridge & DARS ( B ) 02CE Andover RAC 91FH Two Counties CG ( B ) 92LJ South Bristol ARC 81QJ Darneth Valley RS 01CJ Clive O’Hennessy 78VB MIX & MATCH SECTION Pos Group Name Loc Total 1 Telford & DARS 82NN SRCC CG 91XH North Beds Gentleman s CG92TI Shefford & DARS 92XA Bristol CG 81TK Torbay ARC ( A ) 80DQ Clifton ARS 01HH Newquay & DARS 70LJ Kentish Hills CG 01AH Guildford & DRS 91TF Salop ARS 82LQ Thornton Cleveleys ARS 83NU Hillcrest ARS 82UL megabyte OPEN SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 GM3HAM/P IO74WV Y 5T5SN MM0CPS/P IO85RU Y K7BV/ G3GRS/P JO01LD x 7Y+5Y 5T5SM G4BRA/P IO80ST Y NG4C G3ZME/P IO82NN Y 5T5SN G0VHF/P JO01PU Y 5T5SN G3SAD/P IO91TW Y CT3FT 2468 The UHF part of the Colchester Radio Amateurs, G0VHF/P, place : 8 x 23-ele plus 1 x 35-ele on 23cm, and a 4 ten 21- ele batch on 70cm. RadCom December G5RS/P IO91TF Y CT3FT G3WKX/P IO91QS x 5YYU1CF G5LK/P JO01OC Y CT3FT G6UT/P JO01BR Y CT1DIZ/P G0WRC/P IO92BJ Y CT3FT G6ZTT/P IO83QE Y EH5ASF M5DND/P IO91TE Y GM3HAM/P G3ASR/P IO91VO Y EI7M/P 461 6m RESTRICTED SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 GI0RQK/P IO74AI Y CT3FT G0ROC/P IO83VP Y 5T5SN M1AWX/P IO70LJ Y KA2LIM GM0FRG/P IO75DH Y CS0RCL/P G4OHM/P IO82XJ Y CT3FT G3SDC/P JO02ST Y 5T5SN GC3SRT/P IO82LQ Y CQ14HZE G4ATH/P IO83NU Y CS0ORCL/P G0CDB/P IO80DQ Y CS0RCL/P G5UM/P IO92IO Y 9A1B G6YB/P IO81TK Y SQ9CWW G5YC/P JO01HH Y 5T5SN G5XV/P I091GI Y CT3FT G4ARL/P IO92XA Y GM0FRG/P G3RCV/P JO01AH Y MM0CPS/P G3SRC/P IO91XH Y CQ14HZE G3TCR/P IO91KG Y MM0CPS/P G4WBC/P IO92BX Y EI7M/P G0FRS/P IO91PF VERT G4BRA/P 131 6m gloomy POWER SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G2XV/P JO02CE Y EI7M/P G4APD/P IO92LJ Y MM0CPS/P G3RSC/P IO92FM Y EH2ARD G7AIE/P IO90WV Y G6ZTT 307 4m open SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 GM3HAM/P IO74WV Y G3GRS/P G4RFR/P IO80ST x12YGM3TAL/P G3GRS/P JO01LD /6Y GM3TAL/P G3PJX/P IO91TF Y GM3TAL/P MM0CPS/P IO85RU Y G4RFR/P G6UT/P JO01BR Y GM3TAL/P G3SAD/P IO91TW Y GM3TAL/P G3WKX/P IO91QS x5Y GM3TAL/P G4ZTT/P IO83QE Y G3GRS/P G4WAC/P IO92BJ Y GM3TAL/P 444 4m RESTRICTED SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 GI3PDN/P IO74AI Y G3GRS/P G3UKV/P IO82NN Y GM3TAL/P G5XV/P IO91GI Y GM3TAL/P G0ROC/P IO83VP Y G4ADV/P G5YC/P JO01HH Y GM3TAL/P G4FOH/P IO92TI Y GM3TAL/P G4OHM/P IO82XJ Y GM0FRG/P G4ATH/P IO83NU Y G3GRS/P G5UM/P IO92IO Y GM3TAL/P GM0FRG/P IO75DH Y G4RFR/P GC3SRT/P IO82LQ Y G5YC/P 294 4m gloomy POWER SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 GM3TAL/P IO75IU Y G5YC/P M1DDD/P IO93AE LP GM3TAL/P G0OLE/P IO93PV Y GM3TAL/P G4ARL/P IO92XA Y GM3TAL/P G3LHJ/P IO80DQ Y GI3PDN/P G2XV/P JO02CE Y GM3TAL/P G4ADV/P IO70LJ Y GM3HAM/P G4APD/P IO92LJ Y MM0CPS/P G4ALE/P JO01AH Y GM3TAL/P G6ARC/P IO91FH ? ? 4Y GI3PDN/P G7LPP/P IO81QJ Y GM3HAM/P GM4VVX/P IO78UB Y G3JYP 405 2m open SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G0FBB/P JO01LD x 17Y F6KBR/P G0VHF/P JO01PU x 15Y F5KSE/P G5LK/P JO01OC x10Y + 1x18Y F6KBR/P G4RFR/P IO80ST x 19Y F6KOV/P GM3HAM/P IO74WV x 17Y F5UTN G3MDG/P IO91QS x 9Y HB9RF G6YB/P IO81TK Y + 2×10 DK0OX G3SAD/P IO91TW x 6Y HB9SVB/P G6UT/P JO01BR x 13Y HB9G/P G3ZTT/P IO83QE x 17Y DK0HN M0BPQ/P JO01HH Y OL8R G1WAC/P IO92BJ x 17Y F5AHL/P G6GMW/P IO83NU Y F6KCP/P MM0CPS/P IO85RU x 7Y ON4AMX G3ASR/P IO91VO Y DK0OX G3CZU/P IO91TE Y HB9STY/P 697 2m RESTRICTED SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G3SDC/P JO02ST Y F1USF/P G3WIM/P IO91XH Y DL0HB G5XV/P IO91GI Y DL0GTH G3ZME/P IO82NN Y GM0HTT G3TCR/P IO91KG Y DK0LK G4ARL/P IO92XA Y DK0OX GI4GTY/P IO74AI Y F6IFR M0LKB/P IO84KF Y F5UTN G4VMX/P IO92TI Y DK0LK G7GLW/P JO01AH Y DF3KV GM0FRG/P IO75DH Y ON4BAR GC3SRT/P IO82LQ Y DK0WD G0ROC/P IO83VP Y PE1RLF/P G6GS/P IO91TF Y GM3SHK/P G6FRS/P IO91PF Y DF2RI G7MEX/P IO93HO Y DL0VR G4WBC/P IO92BX Y ON4WY 391 2m depleted POWER SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G3CKR/P IO93AD Y DK0OX G8NJA/P IO80DQ Y DK0OX G7APD/P IO92LJ Y F8ALX G8EVY/P JO02CE Y DK0OX M1DDD/P IO93AE LP DK0LK G3ZMS/P IO90WV Y DK0OX G0KDV/P JO01CJ Y GM0FRG/P G0OLE/P IO93PV Y DF0RI G3RSC/P IO92FM Y PI4GN G0ARC/P IO91FH Y DK0WD M0BFB/P IO70LJ Y ON6BX/P G4WAW/P IO81QJ Y G7ANV/P GM3SHK/P IO75IU Y G0FBB/P G6KWA/P JO02CE Y EI7DAR/P curium OPEN SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G0VHF/P JO01PU x 21Y OL4A G5LK/P JO01OC x 28Y F6KBR/P G6YB/P IO81TK x 21Y F5LGF/P GM3HAM/P IO74WV x 28QLY F6GZI/P G4BRA/P IO80ST x 21Y DL0VR G3SAD/P IO91TW x 23Y PA5AO G1MDG/P IO91QS x 23Y DD0PX G7WAC/P IO92BJ x 21Y ON5PX G8ZTT/P IO83QE x 21Y G5LK/P MM0CPS/P IO85RU Y G4BRA/P G7DOR/P IO91TE Y EI7M/P centimeter RESTRICTED SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G3SDC/P JO02ST Y DF0YY G3ZPB/P IO91XH QLYDN3SL G8OHM/P IO82XJ Y DF2VJ G4ARL/P IO92XA Y DK0HN G5XV/P IO91GI Y DL1DAW/P G3GHN/P JO01HH Y OZ1ALS/P MI0BOT/P IO74AI Y G5LK/P G1RCV/P JO01AH Y EI7M/P G3TCR/P IO91KG Y DF2VJ G8BNE/P IO91TI Y DF2VJ M0CKY/P IO93HO Y G5LK/P GM0FRG/P IO75DH Y G5LK/P G8XNH/P IO70LJ Y G3ZMS/P G0AJQ/P IO83NU Y G0VHF/P G8JVW/P IO82UL Y GM3HAM/P M0FRS/P IO91PF Y F6GZI/P G4WBC/P IO92BX Y G4BRA/P cm LOW POWER SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G3CKR/P IO93AD Y DF4OVH G8LED/P IO92LJ Y DF2VJ G3ZMS/P IO90WV Y F5KSE G3NJA/P IO80DQ Y PI4Z M1KTA/P JO02AD Y DF2VJ G0OLE/P IO93PV Y G4BRA/P M1DDD/P IO93AE LP EI7M/P G3RSC/P IO92FM Y GM3HAM/P GC3SRT/P IO82LQ Y GM0USI/P G6ARC/P IO91FH Y GM3HAM/P GM3TAL/P IO75IU Y G5LK/P centimeter OPEN SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G0VHF/P JO01PU x23 + 4×23 DF0YY G0FDZ/P JO01LD m dish OZ1ALS/P G5LK/P JO01OC x35Y DH9NFM G4RFR/P IO80ST m smasher PA6C G1MDG/P IO91QS x 35Y DF0HS/P G3SAD/P IO91TW Y PA6NL curium RESTRICTED SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G3SDC/P JO02ST Y DL0GTH G3OHM/P IO82XJ Y DL0RTA G6YB/P IO81TK Y PA0BAT G3TCR/P IO91KG Y DJ5BV G3ZME/P IO82NN Y DF0HS/P G4FRS/P IO91PF Y DF0HS/P G5RS/P IO91TF Y G3XDY cm LOW POWER SECTION Pos Call Loc QSO Score Pwr Ant Best DX km 1 G3CKR/P IO93AD m serve PA6NL G4JTJ/P IO92TI foot dish DL0RTA G8MNY/P IO91XH Y DF0HS/P G6KWA/P JO02CE Y PA6NL G8JVW/P IO82UL Y G8MNY/P 202 Thanks to G6CSY, G4IRX, PE1EWR, G8ZK, M0BGR for checklogs. 85 
86 Christmas lone The ARRL Handbook 2005 This edition is by far the most extensively revised translation of this work in ten years. Includes analogue and digital signals and components ; working with surface-mount components ; High-Speed Multimedia ( HSMM ) ; new and previously unpublished antennas, and advice on baluns ; satellites and EME, now with new Phase 3E details ; oscillators, DSP and software radio design ; a new chapter with Internet tips for hams, Wireless Fidelity or Wi- Fi, and other radio receiver and PC technology plus p & p Non Members Price International Antenna Collection by George Brown, M5ACN This record is a collection of over 50 of the very best articles published on antennas from around the global. The script is wide ranging and offers solutions to many problems experienced by the antenna enthusiast. Amongst the articles are antenna designs for most amateur bands. Great care has been taken to ensure that there are antennas to cover the image from 136kHz to 1.3GHz, receiving and transmitting, fixed and mobile. Everyone matter to in antenna invention and construction will find something in this book plus p & p Non Members Price only LF TODAY : A Guide to Success on 136kHz By Mike Dennison, G3XDV LF Today is a guide to amateur radio on LF and the effective use of this challenge allotment. Based on the experiences of the LF early experimenters this book will provide the reader with a firm basis thus he will not waste clock having to reinvent the rack whilst still providing much oscilloscope for experiment. LF Today takes the reader step-bystep through the diverse parts of the station, explaining the options available and how to avoid pitfalls. size : 175mm ten 239mm, 128 pages, ISBN plus p & phosphorus Non Members Price ARRL Amplifier Classics This big newly book from the ARRL covers amplifier structure through two-dozen projects and articles drawn from the pages of QST and QEX. The articles cover a wide range including amps for HF, MF, VHF and microwave. Provides virtual designs and construction details for classic tube and solid-state amplifiers at exponent levels from 5 W to 1.5 kilowatt. The reader is besides provided with amplifiers that are safe, authentic and produce loud and clean signals. 176 pages ARRL 2004 ISBN : plus p & p Non Members German Naval Code Breakers german Naval Code Breakers looks in detail at how german code break developed after the trauma of frustration in 1918 and the kind of codes used by the british and allied navies during WWII. All those who want to know more about this crucial earned run average in naval war will find that german Naval Code Breakers provides an interest perspective to this expression of WWII. With over 150 photographs on 160 glistening pages this hard back book is an excellent buy plus phosphorus & phosphorus Non Members Price only only Command Computers, Microcontrollers and DSP for the Radio Amateur by Andy Talbot, G4JNT This book is for the radio amateur and home experimenter who wants to use modern digital and calculator engineering to make more use of his/her radio equipment. It is aimed at those who want to add extra hardware and try new bespeak and communications methods, and to build hardware and systems for controlling existing equipment. particular emphasis is placed on what can be done with the older calculator, nowadays very cheaply available. Software techniques for detecting signals in noise and for automatic beacon monitor are described plus p & p Non Members Price VoIP : Internet Linking for Radio Amateurs by Jonathan Taylor, K1RFD This may be the first base book ever written about overact radio applications of VoIP ! Growing numbers of hams are using VoIP, or Voice Over Internet Protocol, in combination with their radios for long distance communication spanning hundreds or thousands of miles. They ‘re using the Internet as the relay between their basis stations, handhelds and mobile transceivers. This is a template to the four elementary VoIP systems used by hams : EchoLink, IRLP, eqso and WIRES-II plus phosphorus & p Non Members Price Enigma U-Boats : Breaking the code : The True Story by Jak P Mallmann Showell By the acknowledged expert on the history of the U-boat arm in the second World War this book analyses the development of Enigma, its function during german submarine operations and the subsequent codebreaking knead at Bletchley Park. This book examines in detail all the U-boats known to have been boarded by the Allies during the war from which Enigma machines could have been captured. 298 black / white photos plus p & phosphorus Non Members Price merely lone QRP Basics by Rev George Dobbs, G3RJV, QRP Written by the UK ‘s QRP supremo Basics tells of the playfulness to be had by operating with low exponent, both from dwelling and in the great outdoors. Advice is given on how to how to get the best results from a QRP place, how to try out QRP if you have n’t ahead. A large crop of commercial QRP equipment and kits are described. a lot of the record explains how to construct your own station, including complete transmitters and receivers, and accessories. even the experience builder will appreciate the sections on toroidal coils, construction techniques and equipping a workshop. ultimately, there are lists of contests, awards, books and organisations or interest to the QRP. operator in the UK and the USA plus phosphorus & p Non Members Price Low Power communication : The Art and Science of QRP – 2nd version. by Richard Arland, K7SZ. Build, experiment, operate and enjoy ham radio on a shoestring budget ! Ask any QRPer, and they ‘ll tell you that less actually is more. With a handful of parts, you can build a radio and put it on the air. ARRL ‘s Low Power Communication has the resources you need for getting started and the latest data on advance QRP techniques. Explore kit out Building. Chase DX. Build antenna. Brush-up on propagation theory, and take a band-byband operating go. abject exponent, broken cost and big fun ! plus phosphorus & p Non Members Price The Secret Wireless War The Story of MI6 Communications by Geoffrey Pidgeon Possibly the most important UK radio traffic in World War II was handled by a unit of measurement formed in 1938 by Brigadier Richard Gambier-Parry mind of MI6 Section VIII – the communications division of SIS. This book tells of its formation and includes diary entries by one of the ‘founding fathers ‘ recording the secret meetings that took target, and the assembly of its talented staff. It besides reports the earlier days of the original SIS radio receiver ‘Station X ‘ only based in Barnes in SW London. It documents the employment of our agents in embassies abroad, and of those in concern territories ; the report of Churchill ‘s personal radio receiver operator, and there is the description by a german soldier of the Afrika Corps of his operating an riddle machine at Rommel ‘s HQ in the desert plus p & p Non Members Price RSGB BOOKS ARE AVAILABLE IN BOOK STORES ASK FOR GARDENERS BOOKS WHOLESALE ALL PRICES PLUS P & P 
87 Selection CQ all Reindeer RSGB SHOP RSGB Lambda House Cranborne Road Potters Bar Herts. EN6 3JE Tel Fax Specially commissioned this year the RSGB is please to be able to offer a special amateur radio receiver card in aid of the RFC and GB4FUN. These extra special cards are printed on fleshy calling card in a deluxe boastfully format ( 148x210mm ) supplied with timbre white envelopes these cards are ideal for sending to radio amateur friends or not amateurs alike. This humorous card has all its profits donated to the RCF. Show you care about the future of amateurish radio by sending RSGB jacob’s ladder cards this Christmas. RSGB Embroidered jackets and polo shirts Top quality clothe from the RSGB. Show your suppport of thie RSGB with our scope of intemperate erosion and virtual dress. cautiously embroidered with RSGB logos and your own callsign ( if required ) these items make the arrant christmas gift for every amateur. NEW 3.99 per battalion of 10 cards RSGB SOFT FLEECE JACKET Heavy weight polyester Embroidered with RSGB logo Pill resistant Full duration travel rapidly Available in Black Size : Extra Large entirely RSGB POLO SHIRTS Heavy weight 100 % Cotton Embroidered with RSGB logo Stylish three button invention Taped collar Available in Large, XL, and XXL Available in Burgundy & Green CALLSIGN EMBROIDERY SERVICE Why not have your callsign added to your RSGB clothe. For entirely 5 we will have your callsign cautiously added to your Polo Shirt or Fleece in one of two styles. Simply call our Sales Office during office hours or order on-line for access to the service. Delivery is normally days, target from the manufacturer. G3 GEORGE ORDER 24 HOURS A DAY ON OUR WEBSITE The RSGB would like to thank you for your support during 2004 Merry Christmas & Happy New Year ONLY plus p & phosphorus M1MPA PLAIN M1MPA SCRIPT ONLY 9.99 plus p & p 
88 
89 90 MEMBERS ad Members ads FOR SALE APPLE Power Mac G5 calculator, double 1.8MHz, 160GB HDD, DVD/CD superdrive, 512MB memory, Airport Extreme and Bluetooth fitted, o/s 10.3, 17in TFT Apple studio proctor, keyboard, mouse etc. very rarely use and as newly, 1250 ono. Ken, ( Dunstable ). BIRD 43 Thru-line wattmeter with 50H, 1000H and 2500H elements, 250 ono. Bird 43 Thru-line wattmeter in leather case with 50H, 100H, 250H, 500H, 1000H, 5000H and 10000H elements, 480 ono, eve, w/e ( Newport Pagnell ). BIRD Thru-line wattmeter with six elements. Trio R-600 rcvr. Nevada TM-1000 ATU. Audon miniscope. BC-348 rcvr. Optoelectronics 3000 freq meter. No 10 xtal cal, class-d wavemeter. Offers please to, G3ZBM, ( Crewe ). E- mail : CHALLENGER II by Linear Amp UK, 3CX- 1500A7 model, 760. Buyer collects ( Huddersfield ). silent KEYS We regret to record the authorize of the follow radio receiver amateurs : G0APZ Mr E L Killip 18/09/04 G0NLI Mr C Macham 04 G0SCB Mr J Langridge 07/10/04 G2FRO Mr E B H Woolley 04 G3BCI Mr V Cotton 04 G3DZW Mr S T Chrees 04 G3FHW Mr N Ratcliffe 08/10/04 G4NAA Mr J Bain 04 G4UWY Mr S Ince 04 G5IJ Mr I J P James 03/04 G7EID Mr M J Jacobs 02/10/04 G7MVO Mr M Armfield 04 G8RSD Mr G M B Corry 05/10/04 G8VXQ Mr B P Hayward 26/10/04 GM4YZU Mr J C Borland 18/10/04 GW0MAW Mr N Davies 13/10/04 M0DGN Mr N Smith 24/09/04 M1EUT Mr G Johnson 19/08/04 M3ARI Mr R W Coggle 04/09/04 We apologise for mis-quoting the callsign of Mr R L Halls in final month s list. It should have been G3EIW. ELECRAFT K2 parts. Unopened ATU kit KAT-2, 85. K2 top panel with battery and RS-232 interface, 85. postage at cost. Reason for sale, went to 100W. Richard, G3RWL, QTHR, ( Enfield ). ELECRAFT K2/100 tcvr with options 100W, SSB, 160, NB and DSP, fully working. besides c/w Heil MH-2 hand mic, 800. Buyer collects or pay postage. GM0VRP, QTHR, ( Stirling ). free to good home ! 13.8V 50A home brew PSU. Based on Practical Wireless Marchwood blueprint. Collect lone, dense ! G6PSO, QTHR, ( Coventry ). HEATH SB-200 linear ampere, 80/40/20/15/10m, copulate 572Bs. Fitted raw W8CQ boards softstart, balmy key 1V 1.5mA, new HV diode/capacitor board, substitute transformer, h/book, 250. G3JFC, QTHR, ( Sleaford ). HEATHERLITE Hunter adenosine monophosphate easy get down, recent new valve & service, 300. Daiwa 4-way antenna c/o switch, 20. MFJ-722 CW/SSB external trickle, 20. Collect or pay carriage. G4SKX, QTHR, ( Cleveland ). JRC rcvr collection. NRD-515, memory unit, h/book, workshop world, 350. NRD- 525, h/book, original box, 350. NRD-535, h/book, original box, 400. Icom IC-746, gen cov mods, h/book, master box, 650. Non-smoking owners. Constructor s reside headroom. call or for list of commodity equipment, antenna etc. David, G8PPR, QTHR, ( Bradford ). KENWOOD /Trio TR-751E. 2m multi-mode box with man, 200. Plus baby buggy or roll up. G1ZBM, ( nr Bath ). KENWOOD AT-230 ATU, 135. AVO signal gen HF-135, 40. Kenwood SP-50B loudspeaker, 15. Heathkit V7A/UK valve voltmeter, 35 plus phosphorus & phosphorus. Mel, ( Clayton Heights ). linear Heathkit SB-1000, 1 adam 3-500Z, 1000W SSB, 850W CW. All bands inc. WARC. Full Heath software documentation, had light use only, vgc, prefer buyer collects, 500. Alinco EMS 14 desk mic, 30. G3UZM, ( Exmouth ). MARCONI TF-144 sig gen, exempt to beneficial home ! Buyer collects ( Cheshire ). MQ4 mini-beam. 6, 10, 12, 15 17, 20m, used external 12 months, 250. John, 2EOBOT, , ( Alcester ). OLD senesce and deafness force QRT dispatch station, very short used recently, for sale. Kenwood tcvr TS-570D, Watson PSU W-25AM, Ameritron linear AL811, MFJ radio receiver III, Philips Hi-Fi headphones. SG-230 Smart Tuner. Tennamast, 10m standard, 1000 ono. Buyer collects and dismantles with serve from me. G3EFK, QTHR, ( Dorchester ). SILENT identify sale, G3EKX. About 400 domestic and communications sets ( all photographed ), 1500 books and manuals, heaps of previous magazines, aligned and untested HRO coils, about 2500 valves and many spares unlisted. Everything must go ! Have no space ! All prices are negotiable. The more you buy, the better the deal. earphone for lists ( Truro ). SINGLE-trace oscilloscope, 20MHz, mint. Crotech 3031, sensitivity 2mV/div to 10V/div, sweep range 0.5µsec to 0.2 sec/div. Offers ? G6WTD, ( Ryton-on-Dunsmore ). SSB Electronic SP-7000 Superamp, brand new in June. Installed for four weeks, but 70cm unserviceable due to local ( incurable ) QRM, 140 onvo, or will exchange for SP in mint discipline. G0UYC, QTHR, ( Dereham ). TENNAMAST 12m, perfect cond with condom winch, 300. Buyer collects. Yaesu G-450C rotator complete, ( Wells ). TRIO comms rcvr model 9R-59D. Yaesu FT-230 2m tcvr. Altai 5A PSU. Open to offer. G6DJE, ( Beds ). E- mail : congratulation to the postdate, whom our records show as having reached 70, 60 or 50 years continuous RSGB membership : 70 years G6RJ Mr A Robinson CBE 60 years ZL1AOA Mr J R Whitney 50 years GM3JQJ Mr G Moore YAESU 2100Z linear, 300 ono. besides H/B 400W linear. Built to a professional standard, 150. See or hear them working on breeze. G3MDM, ( Salisbury ). YAESU 847 ( 22h texas ), 800 ovno. PSU-30A, 70. Triplexer, 30. Yaesu VR-5000 rcvr, 450 ovno. AOR-8600 MkII rcvr, 450 onvo, all boxed, manuals, bought from new, little used in as-new stipulate. Nonsmoker. Racal RITL + LF adapter. VEC manuals and all cables ( Hemsworth ). YAESU ATAS-100 automatic pistol mobile antenna for FT-847 or FT-100, as modern, 100. MFJ-224 2m FM rig analyzer, many functions including deviation, 100. Icom 24ET 2m/70cm h/h with UT-50 CTCSS board, boxed with soft case, battery boxes, charger, PSU, lapel speaker/mic, 90. Piccolo 6m FM rig, 15. FT-2400M, dead PA, 10. Buyer collects or postage at cost. Eric, G0ORD, eve, ( Stockport ). YAESU cabinet, grey, includes speaker, W81/4 D111/4 H7in with built-in PSU 12V 5A jab, circumference, 15. collect please. G3MBL, QTHR, ( Bury St Edmunds ). YAESU FC-102 ATU. Boxed as new, 250. Yaesu SP-102. Speaker vgc, 70. Postage to be paid. MW0DVM, ( Porth ). YAESU FT-1000MP, vgc with box, mans, etc. Little used, which is the reason for sale. previous RadCom ads have suggested 1000, and I d prefer cash and collection as you can see it working and can ensure dependable transport. Chris, M0HMR, ( Nailsworth ) RadCom December 2004 91 MEMBERS ADS YAESU FT-101ZD c/w mic and man, 200. besides Star Masterkey with Bencher paddle key, 100. David, G4OCK, ( Retford ). YAESU FT-101ZD, 150. AR-146, 2m mobile/base, tcvr, 95. Kenwood TH-79E, Lowe mod, needs barrage, 95. Nissei, 2-15VDC, 30A, PSU, 55. astatic Silver Eagle, T-UP-9-D104, mic. Adonis, AM- 508E, mic, 10. G4XIY, ( nr Matlock ). YAESU FT-480R, batch cond, 120. automatic antenna tuner Z-100 by LDG Electronics raw, boxed, 115. Prefer buyer collects. G4WLI, ( Wirral ). E- mail : YAESU FT-77 with FM, man, mic, wooden mailman. H/B 40m dipole with balun. mobile ants for 20/40/80m, Mag mountain, vgc. No divide, 250. BNOS LPM centimeter lin ampere, 110. Icom IC-U101 12ch UHF simplex and rptr, mic fix bracket, dicker at 35. Heatherlite mobile mic ( Kenwood 8-pin ), toneburst, never used, 12. Kenwood HMC-2 headset, VOX/PTT, ( has headstrap rectify ), 8. All cash. heavy items for solicitation, others plus postage. Derek, G0OEW, ( Nantwich ). YAESU FT-77 with FM, mic, man. Wood carrying box. H/B 40m dipole wire balun, magazine mount, verticals for 20/40/80m. All vgc. No cleave, 250 buyer collects, cash only. Heatherlite mobile mic. Kenwood 8- pin toneburst. Tx/rx switch. F-change buttons. Leaflet. Never used, 10 + post. Kenwood HMC-2 headset. VOX/PTT. Has headstrap repair, so 8 + mail. Derek, G0OEW, ( Nantwich ). YAESU FT-847 accomplished with MH-31 B8 mic and Shure 444D desk mic, 800. Yaesu FT-920 with MH-31 B8 h/m and Kenwood 85 desk mic, 700. Les, M0LFB, QTHR, ( London ). YAESU FT-847 fitted Collins filter. With 25A PSU box, man and microphone. Genuine reason for sale, 785 ono. Inspection invited if required. G8ILD, QTHR, ( Stockport, Cheshire ). YAESU FT-847 HF to 70cm plus satellite ( work ISS ). Superb cond, x Collins YF-1155 filters to suit 847, 60 each or both A ability provision ( linear ), 60. Nissei 3kW swr/pwr/mod meter, MHz masthead preamp, Microset PRH- 145A, 80. Can deliver South/SE ( Haywards Heath ). YAESU FT-847 HF to 70cms plus satellite ( ferment ISS ! ) Superb cond, ten Collins ( YF-115S ) filters to suit 847, 60 each or both, A power supply ( analogue ), 60. Nissei 3kW SWR/pwr/mod meter, MHz masthead preamp, Microset PRH-145A, 80. Can deliver south/se ( Haywards heath ). YAESU FT-857 HF/50/144/430MHz mobile. fiddling consumption, box, mans, extension cable car kit, fluid antenna, day, eves ( Cambridge ). YAESU FT-857, HF, 6m, 2m, 70cm tcvr with DSP fitted guarantee public treasury Jan 2005, never been out of hovel. Buyer pays p/p, 600 ono. Bill, M3IVI, , or ( Houghton-le-Spring ). WANTED CIRCUIT for little oscilloscope, has 5 EF91s and one Z77. Sign on back is three Ls, which is the maker ( London ). E- mail : ELECRAFT K2 built and working with GB CALLS SSB. Good choice HF sig gen for rcvr measurements. John, G3GTJ, ( Somerset ). FT-102 Frequency display or dead FT-102 with working display. Can collect. Phone weekends only. Tibbert, GW3RKZ, ( Anglesey ). KANTRONICS KAM plus TNC. GW4HAT, QTHR, ( Swansea ). MORSE Keys wanted by individual collector, true and microbe keys, sounders, relays, Morse inking machines, heliograph, all cable related items. For a friendly chew the fat ring, Gerald, ( Reading ). E- mail : YAESU FL-7010 linear for FT-790, besides FTS-7 CTCSS display panel for FT-790R. Icom IC- T81E with 23cm. All must be in estimable cond. Geoff, G3KIW, QTHR, EXCHANGE BENDIX RA-1B ( WWII rcvr ) in orig cond. Hammarlund HX-50 transmitter, besides Hammarlund receivers. WWII BC rcvr. For exch 1.5kW Marconi transmitter ( Chippenham ). These callsigns are valid for use from the date given, but the period of operation may vary from 1 28 days before or after the event go steady. manoeuver details are provided in an abbreviated shape as follows : T = 160m ; L = 80 or 40m ; H = HF bands ( 30 10m ) ; V = 6 and/or 4m ; 2 = 2m ; 7 = 70cm ; S = satellite and P = package. Please mail operational details of your especial event station to the RadCom office at least five weeks before issue. The entirely QSL Bureau sub-manager for extra consequence station callsigns is as follows : GBxAAA-MZZ Mike Evans, 322 Heol Gwyrosydd, Penlan, Swansea SA5 7BR, world.com. Will organisers of special event stations please ensure that they lodge batch of envelopes with their sub-manager ? 2 Dec GB2OTH : Opening The Headquarters. LH2 ( G0NTH ) 9 Dec GB2ATC : Air Training Corp. 2 ( G4PSH ) 10 Dec GB4TBL : Trearddur Bay Lifeboat. TLH2 ( MW0AQZ ) 16 Dec GB4YOU : Youlbury ( Scout & Guide Radio ). TLH27P ( G0REL ) GB4YOU : Youlbury ( Scout & Guide Radio ). TLH27P ( G0RJX ) 27 Dec GB6BOB : Battle Of the Bulge. LHV2 ( G0SWY ) RALLIES TI Talk-In ; CP Car Park ; entree ; OT Opening Time time for dis abled visitors appears first, eg ( 10.30/11am ) ; TS Trade Stands ; FM Flea Market ; CBS Car Boot Sale ; B & B Bring and Buy ; A Auction ; SIG Special Interest Groups ; MT Morse Tests ; MA Foundation Morse Assessments ; LB Licensed Bar ; C Catering ; DF Disabled Facilities ; WIN prize draw, raffle ; LEC LECtures/ seminars ; FAM FAMily attractions ; CS Camp Site. 4 december 2004 ROCHDALE & DARS Traditional Radio Rally St Vincent de Paul Catholic Church, Caldershaw Road, off the A680 Edenfield Road, approx 2 miles W of Rochdale. Follow the orange arrows from the M62 jn 20. Please note that this is a Saturday rally ! OT / 10.30am, 1. CP free, TS, B & B, C, TI on MHz. John, G7OAI, ( eve ), [ 5 DECEMBER 2004 BISHOP AUCKLAND RAC Rally Spennymoor Leisure Centre. OT / 11am, 1, accompanied under-14s loose. B & B, C, CP, LB, MT, DF, FAM, TI on MHz. Mark, G0GFG, , or Brian, G7OCK, WEST MANCHESTER RADIO CLUB Red Rose Winter Rally Lowton Civic Centre, barely off the A580 East Lancs Road. OT 10am. TS, B & B, SIG, CP barren, LB, C, RSGB bookshop, DF, and big social sphere. TI on MHz. Steve, [ JANUARY 2005 CONTEST CLUB FINLAND 10th Anniversary Aboard Viking Line MS Gabriella, on circular trip Helsinki Stockholm Helsinki. LEC, C, LB. Proceedings in English. [ and 23 JANUARY 2005 OLDHAM ARC Rally Oldham Sports Centre, Lord Street, in the center of Oldham. OT / 11am. TS, B & B, TI on MHz via GB4ORC starting 7.30am. December 2004 RadCom 91 92 MEMBERS ADS RSGB MEMBERS ADVERTISEMENTS RSGB Members wishing to place an ad in this section should use the official kind printed in RadCom each month. No recognition will be sent. Ads not clearly worded, or which do not comply with these conditions will be returned. If an ad is cancelled no refund will be due. An ad longer than 60 words will be charged pro rata. The RSGB believes that it is inappropriate for members trading in whatever way in radio equipment to place members advertisements. We therefore regret that we are unable to take such advertisements, although we do welcome these in the Classified advertise section of RadCom. The editor reserves the right to refuse any ad for any rationality. In such matters, the editor program ‘s decision is final and no correspondence will be entered into. The RSGB accepts no province for errors or omissions, or for the quality of goods for sale or central. Each ad must be accompanied by the decline remittance, as a credit circuit board requital, check or postal holy order made account payable to the Radio Society of Great Britain. Please note that because this is a subsidized service to members, no agreement can be entered into. Licensed members are asked to use their callsigns and QTHR, provided their addresses in the current edition of the RSGB Yearbook are correct. roentgen members will have to provide their names and addresses or telephone numbers. Please include your town and phone number in the free boxes provided to assist readers. Advertisements will be placed in the first available edition. Please do not send members advertisements to Danby Advertising ( advertising agents ). The completion date for copy is the first day of the calendar month anterior to issue, eg the deadline for the May issue is 1 April. warn : Members are advised to ensure that the equipment they intend to purchase is not subject to a stream rent buy agreement. The leverage of goods legally owned by a finance company could result in the buyer losing both the goods and the cash paid. Members Ads besides appear on the members-only web site : The Members Ads order form is published below. If members do not wish to cut the form out of the magazine, photocopies will be accepted, as will recent copies of the shape from previous months. As a concluding recourse, members may besides send in their advertisements on separate sheets of newspaper, but if you choose to do this, you must supply an accurate son count and, of course the correct fee in the normal manner. RSGB MEMBERS ADS ORDER FORM Application form for one For Sale, Exchange or Wanted ad. Do not mix classifications on this kind ; separate applications must be made. Please ensure you read and understand the conditions of acceptance of these subsidize Members Advertisements, printed at the top of the Members Ads page of Radcom I enclose a cheque/po for. phosphorus Please commission to my accredit card number termination date Issue phone number ( Switch entirely ) Signed department : FOR SALE EXCHANGE WANTED Date RATES : UP TO 20 WORDS 5.50 ; 21-40, 6.50 ; 41-60, 7.50 spare Entries Town Phone Full details and maps on web site. [ 30 JANUARY 2005 FENLAND REPEATER GROUP Horncastle Winter Amateur Radio Rally Horncastle Youth Centre, The Old School, Cagthorpe, Horncastle, Lincs ( nr Horncastle Police Station ). OT 10 / 10.30am, 1. C, Horncastle bacon butties, TS. Tony, G3ZPU, FEBRUARY 2005 SOUTH ESSEX ARS Radio Rally The Paddocks, Long Road, Canvey Island, Essex, at the southernmost extremity of the A130. Radio, computers and electronics. OT 10.30am. C ( home-made ), CP barren, DF, TS. Brian, G7IIO, or [ 13 FEBRUARY 2005 HARWELL ARS Rally Didcot Leisure Centre, Mereland Road, Didcot, Oxon. Signposted from A34. OT / 10.30am, CP dislodge. B & B, C, LB, TS, SIG, DF, TI on MHz. Ann, G8NVI, , [ WAKEFIELD & DRS 14th Northern Cross Radio Rally Thornes Park Athletics Stadium, Wakefield, W Yorkshire. Just out of township on the Horbury Road. Easy access from M1 jns 39 and 40 well signposted. OT / 10.30am, B & B, TI on MHz. John, G7JTH, or [ 20 FEBRUARY 2005 SOUTHGATE ARC Stevenage Radio & Electronics Show Stevenage Arts & Leisure Centre, Lytton Way, Stevenage, Herts. Close to A1 & GNER mainline. OT 9.30 / 10am, 3. TI, CP, DF, TS, SIG, B & B, LB, C. Steve G4UKR, , [ 27 FEBRUARY 2005 SWANSEA ARS Amateur Radio & Computer Show Afan Lido, Aberavon seafront, Port Talbot, 1 sea mile from jn 41, M4. OT 10.30am. TS, B & B, SIG, repeating firearm groups, TI on MHz. Roger, GW4HSH, MARCH 2005 TYNE & WEAR REPEATER GROUP Auction Nancy, , or, or 13 borderland 2005 BREDHURST RECEIVING & TRANSMIT- TING SOCIETY 18th Rainham Radio Rally Mike, MARCH 2005 CAMBRIDGE & DARC Rally John, G0GKP, NORTHERN AMATEUR RADIO SOCI- ETIES ASSOCIATION ( NARSA ) Norbreck Blackpool Rally Peter, G6CGF, , 3 APRIL 2005 Northern Mobile Rally ( Harrogate ) Gerald, G0UFI, [ 10 APRIL st Yeovil QRP Convention George Davis, , 24 APRIL 2005 ALDRIDGE & BARR BEACON ARC Annual Surplus Radio & Electrical Sale Doug, [ 2 MAY 2005 DARTMOOR RC Radio Rally Ron, G7LLG, MAY 2005 MID-CHESHIRE ARS Rally David, G4XUV, MIDLAND ARS Drayton Manor Radio & Computer Rally Norman, G8BHE, or, [ 5 JUNE 2005 SPALDING & DARS Annual Rally Ambrose, M0DJA, , or John, [ 19 JUNE 2005 NEWBURY & DARS Car Boot Sale [ 26 JUNE 2005 SEVERNSIDE TV GROUP West of England Radio Rally Shaun, G8VPG, [ 3 JULY 2005 NORFOLK ARC Barford Radio Rally David, G7URP, or, [ 7 AUGUST 2005 FLIGHT REFUELLING ARS Hamfest Mike, M0MJS, , [ 12 AUGUST 2005 COCKENZIE & PORT SETON ARC Annual Junk Night Bob, GM4UYZ, , 92 RadCom December 2004 93 LETTERS The last bible Letters published in The last Word do not necessarily reflect RSGB policy. last Word letters may be ed to Please notice that letters submitted for The last Word may not be acknowledged. The RSGB reserves the right to not publish any letter, with no reason being given. It is a condition of issue that all letters may be edited for grammar, length and / or clarity. Due to the limited space available, please keep letters a short as potential. extra letters may be published on the RSGB members-only web site at RadCom December 2004 The letters from Ian Bevan, G0YAP, and K B Monaghan, M3HKM, published in The survive password last calendar month produced a huge mailbag, with a proportion of over 4:1 opposed to the views of Messrs Bevan and Monaghan. There is insufficient outer space here to publish more than the adopt two example samples : From : Graham Lindsay, G8BZL May I congratulate Peter Kirby on his reply to letters from G0YAP and M3HKN ( The final son, November 2004 ). What a warhead of erstwhile bombast they both wrote. I know Mr Bevan is a comparative newcomer with only 15 years experience under his belt, but surely he does not think repeater maltreatment started with the recent license changes ? And what is this folderol about ex-class Bs paying to upgrade to M0s broadcasting their egos and hogging the repeaters with their childish and embarrassing QSOs ? He then rants on, making fantastic accusations about aged amateurs propositioning young girls over the air. The aged amateur around here spend most of their time on air discussing what treatment works best for haemorrhoids. now that is embarrassing ! then inadequate Mr Monaghan thinks the amateur bands have been taken over by a network of paedophiles and we are all about to be sued. indeed well done RSGB, I think we are going in the correct direction. There will constantly be dissenters and there will always be those who abuse the hobby and its privileges, but these people have been managed in the by and will continue to be managed. Please continue to expose tirades from the likes of Messrs Bevan and Monaghan. You have to admit that it is marginally more concern than reading the lapp old adverts every month from ML & S and W & S. Sorry guys, only joking. From : Jacqui Johnson, M3JQY … As a newly-licensed M3 I was appalled by the letter from Ian Bevan, G0YAP. I couldn metric ton believe the generalisations that he has made about M3s and alleged course B operators. Who does he think he is ? How can passing a morse test make him either any better an operator, or any more knowledgeable technically ? My husband is a G7, he has been licensed for 14 years and had been into electronics since he was 8 years old ( now 41 ). He is very knowledgeable in valve technology, transistors, integrated circuits and has realigned many sets for many people ( some G4s ! ). He is vitamin a stipulate as many socalled class angstrom operators, if not more so many a time we have listened to groups of old timers on HF who waffle off ( nothing wrong with that ), but their operational routine is awful. These alleged class deoxyadenosine monophosphate operators, who are better qualified, talk and spill and then after 15 minutes ( only ), give everyone s callsign – all on exceed of one another. The total of doubling is awed ! When our son ( nowadays 12 ) became matter to, we both took our foundation tests – he was 11 at the meter. My son randomness manoeuver is first class ; he has been complimented on this by many local amateurs, those promote afield in the UK, and those he has contacted using HF on more aloof shores – and yes, Mr Bevan – using his allocate 10 watt ! We are both identical fortunate having an experience amateurish in the kin – this being the case for many newcomers to the hobby. We have all become so imply in the avocation, we regularly help our local cabaret run particular event stations, then much so that our son is one of the asterisk operators, normally making more contacts than any of us. He is a pleasure to listen to as he has so much exuberance and operates admirably. I have besides become more involved as I am now club secretary. excess office ? From : Peter Chadwick, Sen MIEEE, G3RZP, Past President I was matter to in the letter from G4ZRZ ( The last password, November ) on the habit of excessive power. Many of us still quote input power : on CW, kilowatt is easier to send than 400w. At 1kW DC stimulation, I get about 550 watts out of my analogue, and with 180 feet of coaxial cable, that south well under 400 watt at the antenna on 20m. Again, if there s a VSWR on the feeder of 2:1 – quite acceptable at HF, evening with 30kW transmitters watts measured output is 400 watts at the antenna, assuming no feeder losses. If you have a wire antenna and a tuner, it s quite easy to lose another 1dB. last, you need to take into report the measurement uncertainty. professional standards require measurement of conduct power to ±0.75dB for a certainty of 99.9 %. Put another way, under lab conditions, that 400 watt is anything between 337 and 475 watts – without considering feeder personnel casualty and SWR on top. Anyone interested in pursuing measurement uncertainty can find a identical interest report from ETSI, the european Telecommunications Standards Institute, ETR 028, which is available at I am surely not condoning the use of excessive power but I think one has to be a act careful in judging whether the guy who says he s running 50 watt on 160 or 1kW on 40 actually is breaking the license rules – particularly if he s running an old valve outfit and talking in terms of stimulation baron. little loops From : Mike Underhill, G3LHZ Having seen the Technical parallelism on small loops ( RadCom November p100 ) my first reaction was No gloss needed – the results merely speak for themselves. But then I realised that all the comments were based on my results and not on any measure results from the critics themselves ! So the likelihood of the critics actually conducting any real, not simulated, experiments is identical broken. therefore I throw out another challenge : please devise a practical experiment that uses traditional physics to demonstrate that the efficiency of a small transmission tuned loop on its own is less than, say, 10 %. Please ensure that losses from any adjacent environment are not included. then we can ask an independent person or team to ( a ) verify that the pro- 93 94 LETTERS model experiment is within the laws of physics as at present silent, and ( bel ) conduct the experiment. I will of course conduct any reasonable experiment myself as a crabbed check. Remember I have to be convinced as well, or we will have got to a genuine blind alley and the question will never be resolved. Where the truth of science is involved, I besides will stand my grind or change my mind as the accuracy dictates. This letter is besides intended for those at least fix to keep an open mind on the topic of belittled loops. so can I urge you to re-read what the critics have said in the Technical commensurateness, in order to answer the watch two questions : 1. Do the arguments put forward by the critics actually stack up with all of traditional physics ? 2. How much of what the critics say I said is actually in my articles ? In his letter Ben Edgington ( The last word, November ) has besides challenged the simulators to produce calculator programs that are not so misleading about cringle radiotherapy resistances or at least explain the discrepancies. This I hard support. How can they have been therefore wrong for so long ? The damage done barely does not bear think of ! But possibly noone cares about this in the cosy global of simulation ? The time to lay this subject to rest is when the real, not simulated, truth and not fair impression has been placed on the table, and not ahead ! megahertz From : Brian Alderson, G3KJX Re : MHz, many thanks to all for the make involved in obtaining this extra allocation. The Ultimate DX From : Pat Hawker, G3VA The article by John D Heys, G3BDQ, noting the eightieth anniversary of the ultimate DX UK – New Zealand contact ( RadCom October 2004 ) provided an excellent account of an event hailed at the time by Wireless World as Amateurs girdle the world – american papers please copy. It was a remarkable accomplishment by the new Cecil Goyder, as an authorize operator of the Mill Hill School place, 2SZ. At the meter he made that indelible mark on the history of short-wave radio he was a student at the City & Guilds Institute, Imperial College, London University. Cecil Goyder provides an excellent model of the way in which, in the 20s, a youthful interest in amateur radio frequently led to a professional career in radio receiver communications or air engineering. To add to G3BDQ s article, it may be worth recalling that in the 1930s, Cecil Goyder became engineer-incharge of All India Radio and postwar became first a technical adviser to BOAC and then with the United Nations communications and broadcast radio services, a post he held until his retirement. He died in February 1980 as a result of being knocked down by an car in Princeton, New Jersey. Another accomplishment in the field of Amateur Radio by the youthful Cecil Goyder was his build of the 30m, 1.5kW sender with which Gerry Marcuse, G2NM, made his pioneer broadcasts to the british Empire from 1 September the first authoritative short-wave broadcasts from the UK, some weeks before the less successful BBC first experimental broadcasts on G5SW. [ It was not entirely in the 1920s that a youthful interest in amateurish radio could lead to a professional career in radio receiver communications or circulate mastermind : it placid happens today ! – Ed. ] HF from a flat From : Nigel Booth, M0CVO I read David Wright second, G4BKE, letter ( The last word, November ) asking for advice on an HF antenna in a categoric. I have lived in three flats, all ground floor with others above. From the foremost I only operated VHF as I was then a B-class amateur. In the second, my first base HF fixed was an FT-102 run a half-size G5RV. This was set up as an inverted-v in the little enclosure behind the place. I belated went QRT for a while and then moved to Germany. After I returned to England I had to live in a shared house for a while. here, no external antennas were permitted any. however, deciding to get back into amateur radio, I purchased an FT-101ZD, again with a half-size G5RV. No external antenna ! I merely wrapped the G5RV around the inside of the bedroom creating, effectively, a loop. As impossible as this may sound, it actually worked and I made some reasonable contacts. I am immediately at my deliver QTH, where I have no garden. No antenna or extensions are permitted. I am again in a footing floor two-dimensional with two others above me and more to either side. The solution ? I have an AE270 duoband collinear on a 20ft mast bracketed to the wall, an MTD-1 trap wire dipole ( 10, 15 and 20m ) fixed to the mast using a bracket just 10ft above grind, merely above my windows and fastened at each end to downpipes, and an EVX4000 fourband vertical sitting on a 10ft pole bracketed to the wall future to the other, about 3ft apart. This set-up works finely. It is no major DX station but it gets me out OK. Details withheld From : Phil Stevens, G3SES Thank you for the publication of the latest RSGB Yearbook which is, as common, an excellent informant of information for the radio amateur. I expect many purchasers of the koran obtain a copy, chiefly, to look up details on currently-licensed amateurs and must be frustrated when they find no information next to the callsign. I realise that there is no obligation for an individual to supply his / her address and there must be many amateurs who, for absolutely valid reasons, do not wish to provide their addresses. What does concern me is that the proportion of stations omitting details is increasing per annum. A simple analysis shows that 10 % of G3S** stations have elected to have their details withheld whereas 38 % of M3S** stations show no details. possibly immediately is the time to delete all Yearbook entries which give no details as they are, in my opinion, a waste of paper. My bookshelf is groaning under the slant of a accomplished set of Callbooks / Yearbooks from 1980 to 2005 and earlier editions are useful for providing details of some amateurs who have immediately become depart of the Details Withheld set. I am concern in what both the RSGB and other members think of my suggestion. [ The universe of a callsign in the Yearbook, tied without any details, at least indicates that the callsign is still valid and therefore that the holder has renewed his / her license. The lack of a callsign in the Yearbook suggests that the holder has either lost interest in amateur radio or possibly has become a dumb Key. however, in order to make the Yearbook arsenic useful as possible to your chap amateur, you are encouraged to instruct RLC in Bristol to release your details unless you have a genuine reason for them not to appear in print – Ed. ] Experienced operators not constantly best From : John Young, GM6LYJ I have recently been listening around 40m through the day, being on longterm sick forget, and I have to say that in some instances I am dismayed at the function standards being displayed by some longerstanding amateurs on nets. In particular one of the military nets has a net control who seems to think that their net is the merely show in town, and suffering befall anyone who strays within a few kilohertz of their chosen frequency. With ceaseless remarks about crud interfering with their QSOs, does he not realise it is the lapp for everyone on a crowded band ? Is this the example that inexperienced modern operators should be shown upon trigger to the hobby, and on to nets, members of the particular society or not ? This net restrainer lowered himself to an all time abject, when in his opinion a french station had strayed besides finale, and the comment was made that possibly the french operator would 94 December2004 RadCom 95 letters drop dead with a heart attack. Quite aside from the disgust I felt, being off work having recently having suffered a heart attack myself, I m surely there are early operators and SWLs out there who have lost friends and relatives through such events. Our license states that we should not send messages which are of an offensive nature. I would suggest that, even if other members of the especial society don t feel it allow to stand up and make the remark, such a net control would be better to stand down from the position, save his own exasperations and allow person to control the net who can do so without resorting to verbal mistreat of others. The ceaseless remarks of the particular net restrainer besides seem to gee up other net members to the point where they switch in linears with the purpose of, as one frame it, giving them some stick, and that was a G3 ! From what I have witnessed, it appears that the internet in motion does not suffer so much from mic keyers and debate QRM when a different restrainer is in the chair. I hate to say it, but is there not a lesson to be learned if that is that event ? Alternative address From : R C Hills, G3HRH ( /P ) I believe that the interview of which suffix to use at an option address needs to be looked at again. I write from our second home where I have a permanent station. To me it seems quite absurd to have to sign /P when the station can not by the wildest stretch of imagination be called portable. Using the public AC mains issue is fair one exemplar. The old suffix /A by rights describes that situation and I very think that it should be reintroduce. I understand that it was dropped because of the confusion in some minds as to whether to sign /A or /P when using a handie in the house for example. The definition of /A should surely be for a position in which the install place is every bit deoxyadenosine monophosphate permanent wave as that at the independent address. In other words the alternate address could equally qualify as the main address. I understand that by prior telling to Ofcom it is possible to drop the /P but that would be unhelpful to those using the annual to find the station placement. I have talked to quite a few other licensees who all share this position thus possibly the responsible committee could please take another count with a watch to having it included in the license schedule ? RadCom December 2004 Hughes discovered radio waves From : S F Brown, G4LU Mr Gregory, in his encomium of Sir Ambrose Fleming ( October RadCom ) says the Branly tube was the first detector of radio waves. The experiment that Branly describes in his koran La Télégraphie Sans Fils shows that he received signals between two rooms over a distance not much greater, if at all, than Hertz had previously achieved with his resonator. Both had been preceded by Professor David Hughes in 1879 using the indifferent contacts of his microphone. unfortunately, when Hughes demonstrated his discovery to members of the Royal Society they disillusioned him by declaring that his results were due to induction or conduction. consequently, he did not publish his findings until much by and by when they had been confirmed by the experiments of other researchers. Hughes, though disappoint, was late big and said that these following researchers should have the credit. Blake in his history of Wireless Telegraphy and Telephony, quoting from another publication, says Hughes experiments of 1879 were about a discovery of hertzian waves before Hertz, of the coherer before Branly, and of Wireless Telegraphy before Marconi and others. DXpedition frequencies From : David Fryer, M0COM The frequency 14195kHz is normally set aside as a DX window for expeditions ; there is no written agreement on this but it is an sympathy amongst stations around the world. deplorably, due to the actions of one sicilian station, IT9RYH, contacting DX stations is now very difficult due to persistent throng of this frequency. The station in question does not recognise this agreement and is now preventing manipulation of this frequency by occupying it and transmitting jam signals. This is highly unfair to the many DXpeditions who would like to make use of this frequency for transmitting from rare locations. many stations including myself have contacted the post initially politely and then quite clearly to request that the frequency in question is left open for DXpeditions around the global. however, all our efforts have been abortive and he continues to transmit and jam the frequency flush over the top of some DXpeditions, eg the Lord Howe Island expedition, VK9LA. I am unfamiliar with the italian amateurish radio system, however, I would appeal for your aid in trying to resolve this matter which is causing a distribute of bad feeling amongst the amateur residential district cosmopolitan. [ No-one owns any frequency, whether it be a DXpedition, regular final, or person. Any place, including IT9RYH, is absolutely entitled to use kilohertz if that frequency is not in use at the time he starts operational. however, if it is in consumption he should, of course, go elsewhere. Most courteous amateurs will move to accommodate a DXpedition or regular net if asked politely to do thus – but sadly not all operators are sol gentlemanlike – Ed. ] Rusty run off effect From : Don Pinnock, G3HVA I disagree with Dick Marshall, G3SBA, regarding harmonics due to the hoary rigidly effect. While acknowledging that undesirable signals could be generated in the meet mode, the chances of it being the choice source of noise to 405-line BBC 1 television ( 42MHz sound /45MHz vision ) was very improbable. The star campaign of the harmonic problems afflicting amateurs in southeast England during the 50s and 60s was not the rust thunderbolt effect, but the sender itself. To permit operation on HF, in particular 14 and 21MHz, the 2nd and 3rd harmonics had to be virtually eradicated, since even a microwatt of RF on the outside of the sender cabinet or coaxial self-feeder would inevitably be transmitted and cause intervention to nearby television receiver receivers. A vector had to be shielded and filtered 100 %, and even commercial rig fell down badly in this obedience. It was not surprising that identical few stations in southeast England operated on 14 and 21MHz during television hours. During the 60s, I spent several years developing and testing a sender with minimal harmonic output, and demonstrating it to grateful, but highly doubting, members of radio clubs all over southerly England. It finally became the capable of an article in the Jan / Feb 1970 RadCom entitled Where TVI is a trouble, build this topband to ten SSB vector. This rig was arsenic harmonic-free as it was potential to achieve using home-brew equipment, and distinctly showed that 150W of SSB could be used on 21MHz with no QRM any, even with minimal spaci9ng between transmitting and television receiver antennas. however, it was impossible to design an antenna for 14MHz which was effective at that frequency, but which would block the infection of remainder harmonics between 42 and 45MHz. A low-pass trickle made no dispute any, since the harmonics would by-pass it via the outer braid of the coaxial feeder. During this period, I discussed harmonic noise in detail with thousands of amateurs. Of those affect, none had managed to overcome the problem completely, none had experienced the out of practice bolt effect, and none had found a low-pass trickle that worked. The problem was not their filters or rusty bolts, but harmonic escape from their rig ! The point of my letter is that 14MHz operation was about impossible, at that time, during television receiver hours in fringe areas like Harpenden where Dick lived and Luton where I lived. any difficulties he had with his neighbor would about surely have been due to harmonics.. 95 
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98 AUDIO HEIL USA- QUALITY AUDIO PRICES DOWN ! HEIL PROSET HEADPHONES & BOOM MICS New Even Lower Prices ! top quality headphones with boom microphones. Choice of mic. elements, HC-5 ideal for rag chew or HC-4 for DX communications. Icom models fitted with IC element. Choice of AD-1 ( 16.95 ) interface leads for most makes of rigs. PRO-SET-PLUS Large H/phones with HC-4 & HC B PRO-SET-PLUS-ICLarge H/phones with IC & HC B PRO-SET-4 Large H/phones with HC-4 element B PRO-SET-5 Large H/phones with HC-5 component B PRO-SET-IC Large H/phones with ICOM component B PRO SET QUIET PHONES B NEW ! AUDIO HEIL GOLDLINE HAND MICS Goldline professional quality moral force microphone. Three versions available, GM-4 with Studio & HC-4 elements, GM-5 with Studio & HC-4 elements and GM-V Vintage Goldline with Vintage Studio high electric resistance component, for older valve rigs such as Drake & Collins. Includes base threaded holder. Requires CC-1 adapter A. GM-4 Goldline HC-4 hand mic B GM-5 Goldline HC-5 hand mic B GM-V Goldline Vintage Hi-z hired hand mic B TB-1 MATCHING DESK STAND This smart desk stand absolutely matches the HM stick series of microphones. Base diameter is approx 120mm and full stature of bandstand is approx 110mm. HEIL CLASSIC DESK MICS The Heil Classic studio apartment timbre microphone, demand replica of the 1930 mho RCA 74B type of circulate microphone. Inside it has the benefit of modern engineering. Two inserts are provided, one for broadcast studio apartment choice and a choice of one other Heil cut-in. Includes base stand, soft-touch PTT bet on panel switch and cover for microphone. Requires CC1 adapter. HCL5 classical retro-look HC-5 desk mic B HCL4 Classic retro-look HC-4 desk mic B HCLic Classic retro-look IC desk mic B SM-1 SHOCK MOUNT B FS-2 PTT FOOT SWITCH This shock mount decouples the microphone from the smash and prevents oscillation noises. The mic is suspended in an 8-point nylon ring and comes with the standard 5/8in – 17mm match. * HC-4, HC-5 or Icom elements. * Noise cancelling on/off * PTT push button * Phase reversion switch Transceiver interfaces : ( 8-pin ) AD-1 Yaesu, Kenwood or Icom Modular types AD-1M The latest free from Heil, a traditional boom-mic headset with earphone acoustic make noise cancelling to exclude external noises and phase reversal to improve the receive trope learn between heading pieces. PSQP-4 ( DX ) mic ejection seat PSQP-5 ( normal ) condensation PSQP-IC ( Icom ) PRICES DOWN PRICES DOWN Ergonomically designed to require less feat to operate. The hinge is under your list alternatively of aside from your foot. It can control two devices from a single mathematical process A CB-1 ( H ) MATCHING DESK STAND This desk stand has been designed specifically for the Heil Classic & Heritage microphones. PRICE DOWN A B LINEAR AMP RANGER 811H ATU 945 D * MHz *800W CW or SSB, 400W RTTY *Uses 4 x811a vertically mounted *Drive W *Toroidial AC Power Transformer *6:1 Reduction Drive on Tuning Controls * Near Silent Papst Cooling fan *Front-panel ALC Adjust Control *Built-in AC 8A Supply *Size 355 x 240 ten 405 millimeter *Weight 25kg The Ranger 811H uses four vertically-mounted 811A valves to produce 800W on the Amateur HF bands. Each band has its own tuned I/P and the O/P Pi network has a nine-position bandswitch for better tune. To aid tuning there are 6:1 decrease drives on the tune and load capacitors. The valves are cooled by a 120mm, low make noise Papst fan which gives excellent cool but is so quiet that you will barely know its running. Front panel features include two backlit, flush-mounted meters for denture current and grid current. AVAIR VSWR/POWER METERS AV-20 AV B B MHz ( AV-20 ) MHz ( AV-40 ) Impedance 50 Ohms Power 0-15W / 0-150W switched Measures forward / reflected exponent + VSWR Sensitivity 3W for full scale deflection Accuracy 10 % at full moon scale Sockets SO-239 Size 85 x 87 ten 95mm Weight 280g TOKYO HY-POWER HL-100BDX NEW Turn your QRP outfit into a infrastructure station transceiver by the addition of this 100W Linear Amplifier. Following on from the successful HL-50B is the modern HL-100BDX. alternatively of 50W out you can now get 100W for merely 5 or 10W input. The HL-100BDX is ideal for the FT-817, boosts RF out to base station power levels. Powered from 13.8V DC the HL-100BDX is easily attached to your QRP transceiver. Has car band switching & ALC end product B bhi NES10-2 DSP SPEAKER B NES10-2 Combined speaker and programmable DSP unit of measurement. Offers dramatic noise decrease, even reduces annoying hetrodynes. 8 Ohms, 8 filter settings, 3.5mm plug, 12-24V DC NES5 basic hack & go model B A fix level of DSP noise cancellation with the same dramatic noise & heterodyne reduction. bhi NEIM B NOISE ELIMINATING IN-LINE MODULE * Noise attn -20dB ( typical ) * Noise Attn levels 8 * Audio output power 2.5W RMS soap ( 8 Ohms ) * audio connections : Line level in/out ( RCA Phono ), Audio in/out 3.5mm mono jack * Line i/p electric resistance 10K * Line o/p electric resistance 100 Ohms * Line in sensitivity 300mV -2V RMS * Headphone socket 3.5mm infectious mononucleosis laborer * Power 12-24V DC 500mA WATSON HP-100 HEADPHONES B Excellent lightweight communication headphones with tailor response ideal for the modern tranceiver or recipient. *8 Ohms 200-9,000Hz *Adjustable headband *3.5mm stereo plug *1/4 stereo adapter. WATSON HP-200 HEADPHONES B Superb headphones with sew response for radio comms. excellent sound proofread, can pull in the weak DX. *Mono 8 Ohm ,000Hz *Padded Ear pieces *3.5mm stereo plug *1/4 stereophonic adapter. SG-237 Auto ATU SG-231 Auto ATU MHz W pep ( 40W CW ). Min wire length, 7m. 50 Ohm feed. Needs 12V at approx 300mA speed of light 1-60MHz W pep ( 50W CW ). Min wire length, 7m. 50 Ohm run. Needs 12V at approx 900mA hundred SG-230 Auto ATU SPECIAL OFFER Buy an SG-2020 or SG-2020ADSP transceiver with any SGC Coupler ( except SG-239 ) and receive a FREE SGC Multimeter ( worth 19.99 ) PLUS 30 ( iraqi national congress Vat ) OFF the monetary value of the copulate. SG C MHz 1W-20W SG-2020ADSP C MHz 1W-20W + DSP MHz W pep ( 80W CW ). Min electrify distance, 7m. 50 Ohm prey. Needs 12V at approx 500mA hundred PRICES DOWN ! high Sierra Sidekick from USA New 80m-6m Hi-Q variable tune Mobile antenna. Mounts on 3-way magnetic ride Handles 200 Watts Supplied with cables and switch box – can run from cigar barge. As featured in Radcom by G3LDO C HS-1800 PRO 80-10m Mobile Antenna The HS-1800/Pro is eminent Sierra s very latest version of their all-band 80m to 10m variable star frequency mobile blister. With a handbuild closely 5cm ( 2in ) diameter, and a match unit built into the Universal Mount Bracket, nothing out performs it and nothing approaches its standard of engineer. This in truth does radiate a potent signal. With 100 Watts, contacts are angstrom easy as from a base station. The secret is in its amazing efficiency. We measured up to 6dB exponent advance compared with a elementary coiling – and you don t have to get out of the car to change bands ! C 
99 WATSON W-10AM PSU WATSON W-25SM PSU WATSON W-25AM PSU WATSON W-5A PSU MANSON EP-925 PSU AVAIR VSWR Meters AV B Two sensors used for HF and VHF/UHF process. * MHz, MHz * 5W, 20W, 200W, 1kW * Av or PEP AV B C One of our best selling world power supplies due to its versatile specification. *Output 0-15V DC, 10A *Over current protected *Dual meters *3 sets of terminals *Front control panel fuse *Supply 230V AC 50Hz B Very popular budget switch manner exponent issue. *Output voltage 13.8V DC *Output current of 22A ( 25A extremum ) *Front panel output terminals *Over stream & voltage security *Quiet operation C DC ability supply for the reside & clairvoyance. for use with 100W transceivers. separate electric potential and current meters. *Output voltage 0-15V DC *Output current of 25A ( 30A point ). *3 sets of output signal terminals *10A cigar socket. *Over stream auspices B DC power issue for the reside and low power QRP transceivers. *Output voltage 13.8V DC *Output current of 5A ( 7A flower ) *Front panel output signal terminals *Over current protective covering C A general aim 3-15V DC, 25A ( 30A point ) office issue able to provide the needs of the advanced 100W HF transceiver. *Dual analogue meters *Over current protection *Large power terminals for rigs *Quick snap connectors for ancillaries ALL NEW Ideal for HF and VHF operation. It features senior high school power handling up to 1kW * MHz * 5W, 20W, 200W, 1kW * Av or PEP AV B * Covers 23cm * 2 Sensors * MHz, MHz, MHz, MHz * 5W, 20W, 200W, 400W * Av or PEP NEW SGC Master Antenna Controller MAC C New Low Price ! * Automatic ATU * MHz * 5-Way Selector * Coax or Balanced * Long Wire The MAC-200 will work with any HF transceiver up to 200W output. It has 3 outputs for wheedle and one each for electrify and balanced – all switch selected. 168 roll memory bins lets it remember for agile QSY. With an electric resistance range from Ohms, and built-in VSWR and power meter, it is all you are ever likely to need ! Requires 12V DC. WEST MOUNTAIN RIGBLASTERS RIGblaster pro Data interface 8-pin/mod, Cd & cables B RIGblaster Plus Data interface 8-pin/mod, Cd & cables B RIGblaster M8 Data interface 8-pin, software & cables B 4T8-KIT NEW Conversion Kit from M8 or Plus to 4pin A RIGblaster nomicdata interface 8-pin/RJ-45, software & cables ( Extra Cables available. ) B FT100-CBL Adapts all units to FT100 input A RB-CD Standard RIGblaster program candle 9.95 A FREQUENCY COUNTERS WATSON The FC-130 is an ideal frequency counterpunch for the trail, mobile or portable use. Supplied complete with Ni-Cads, charger and telescopic whip. Super Searcher RF finder & freq. cnter 10MHz-3GHz B Super Hunter Frequency counter 10Hz-3GHz B Hunter Frequency counter 10MHz-3GHz B FC-130 Frequency counter 1MHz-3GHz B OPTOELECTRONICS Top-of-the-range intersection from Optoelectronics, the X-Sweeper is a in full featured nearfield recipient that displays frequencies analogue signals in spectrum format on a 64×128 graphic display. It has 20 memory banks storing 100 freqs in each. X-Sweeper NEW Nearfield Receiver 30MHz-3GHz C Xplorer Freq. cnter / CTCSS/DTMF decode B Digital-Scout Digital Freq. counter 60MHz-2.6GHz C Scout Freq. finder 10MHz-1.4GHz B M1 Freq. cntr 50Hz – 40MHz B M1-TCX0 M1 + temp controlled crystal oscillator B Cub Mini counter 1-2.8GHz B NEW Designed for radio receiver communications and lecture. This dense duty unit is built into a bootleg project alloy lawsuit and has a sew frequency answer which is ideal for SSB. It matches the color of brand HF transceivers and is supplied with 3.5mm lead. Size 12W adam 18H ten 11D curium. Weight 0.85kg. SP-2B c W-25XM Carriage 10 New Tailored Audio Base-Station Speaker NEW New compress, variable voltage, switch-mode ability add. About the size of an IC-706, this hunky low-noise add will ability any 100 Watt transceiver. Weighing just 1.65kg it operates from either 230V or 115V AC. COAX SWITCHES CS way coaxial cable throw rated over 1kw ( HF ) and up to Fitted SO- 239 sockets A MFJ way coaxial cable interchange rated over 1kw ( HF ) and improving to Fitted SO- 239 sockets A CON-K COAX CONNECTOR KIT B Kit comprises : 2 x N plugs 2 ten N sockets 2 ten BNC plugs 2 adam BNC sockets 2 ten PL-259 plugs 2 ten SO-239 sockets 2 ten SMA plugs 2 ten SMA sockets 2 adam Mini UHF plugs 2 ten miniskirt UHF sockets 2 x TNC sockets 2 ten TNC plugs 6 x interconnectors The kit comprises a set of coaxial cable cable connection adaptors. Six threaded interconnectors enable any of the add plugs and sockets to be assembled bet on to back to form the adapter of your choice. The concentrate pins of all the connectors are gold plated. W2IHY 8-BAND GRAPHIC EQUALISER NEW 8-Band Graphic Equaliser ( Bands below ) 59/100/200/400/800/1600/2400/3200Hz Noise Gate ( adjustable level/delay ) Mic input signal electric resistance 200/600 Ohms or High Headphone monitor LED tied indicators Input : 8-pin, phono or XLR Straight through options Supply : 12V DC DC cable included Size 207 x 70rear/40front ten 130mm Weight 750g New Graphic Equaliser & Mixer The W2IHY is an 8-band graphic equalizer, plus noise gate specifically designed with radio communications in beware. The graphic counterweight covers 8-bands between 50Hz and 3200Hz – the distinctive stove for SSB. This enables you to finely adjust the sound recording reaction to improve your mic and match your radio receiver. UB-802A dual Mic graphic counterweight with double variable 60dB pre-amps plus 2 ten mon/stereo tune inputs.configure to adjust both tx & rx audio and monitor both through phones. Professional quality features low-mid-hi, tape in/out, 1/4 laborer and XLR sockets, 48V for condenser mics etc. Plus free AC adapter. In/out adapter sets for 8-pin mics : K-802, Y-802, I c *9.7-17V DC ( 13.8v notch ) *Input 230V or 115 AC *25 Amps peak *22 Amps continuous *Fan cooled *Dual end product terminals Output leads for Yaesu, Kenwood or Icom c *Dual meter volts & current *Over electric potential & stream protect *Removable AC lead *Illuminated meter *Protection warning light up *1.65kg 170w x 180d x 65h millimeter 
100