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For the very best in Com munications Receivers L k to Lowe LOWE HF RECEIVERS DO IT AGAIN! HF-225 voted "RECEIVER OF THE YEAR" in 1990 by W.R.T.H. HF-225 "FINLANDIA" voted "BEST DX RECEIVER 1992" at the EDXC Convention in Finland. Final choice was from IIF-225, NRD-535 and IC-R72E. ONCE AGAIN THE REST IS BRITISH! LOWE ELECTRONICS LIMITED Chesterfield Road, Matlock, Derbyshire DE4 5LE Telephone: (0629) 580800 Fax: (0629) 580020 BRANCH ADDRESSES: London (Middlesex): 223 Field End Road, Eastcote. Tel: 081-429 3256 London (Heathrow): 6 Cherwell Close, Langley. Tel: (0753) 545255 Newcastle: Newcastle International Airport. Tel: (0661) 860418 Cumbernauld: Cumbernauld Airport Foyer. Tel: (0236) 721 004 LO WE Bristol: 79/81 Gloucester Road, Patchway, Bristol, BS12 5JQ. Tel: (0272) 771770 LO WE Cambridge: 162 High Street, Chesterton. Tel: (0223) 311230 Bournemouth: 27 Gillam Road, Northbourne. Tel: (0202) 577760 Leeds: 34 New Briggate, Leeds. Tel: (0532) 452657 Kent: Chatham Road, Sandling, Maidstone, Kent, ME14 3AY. Tel: 0622 692773 Plymouth: The Basement, Royal Fleet Club, Devonport, I'lymouth, Devon PLI 4PQ. Tel: 0752 607284 Managing Editor Mike Dennison, G3XDV Assistant Editor Marcia Brimson Production Editor munication Sid Clark Technical Editor Paul Lovell, G3YMP Technical Illustrator N E W S A N D R E P O R T S Derek Cole Editorial AasIstant John Davies. G3KZE 4 THE RADCOM LEADER There's never a dull moment for General Manager Peter Kirby_ Production Assistant Jennifer Preston 5 NEWS AND REPORTS - in colour Editorial Secretary Guildford School Seen in Space e Visit Your Headquarters on 19 Erica Fry June • College Activity • GB2RS Plymouth • New RLO • Christian Amateurs' Conference e RSGB at NEPCON'93 • D-day COVER PICTURE: All contributions and correspondence Commemorated • Packet Frequency Proposals • Direct Debit concerning the content of Radio Arguably the most famous radio Double Jeopardy • Liberty and Fraternity • Jaybeam and TV Communication should be posted to' amateur in the World is HM King Masters • EMC Standard - An RSGB Proposal • GAM1 to be Hussein of Jordan. We were The Editor Installed e 1993 IARU Conference• RSGB President Visits ARRL Radio Communication privileged to find out first hand just • EMC Liaison Off icer • Prosecutions • Club Publicity in D-i-Y Lambda House, Cranborne Road what he thinks of the hobby. Potters Bar. Herts EN6 3JE Radios Code News • Scottish Trophies • Jersey Club's New HO Colour Feature page 50. Tel: 0707 659015 44 RSGB AGM 1992- Informal Session Photograph: Raymond Irons. Fax: (Editorial only) 0707 649503 E-mail (Telecom Gold) 87:COG083 46 MEMORANDUM AND ARTICLES OF ASSOCIATION - A review 50 THE HOBBY OF KINGS RodCom Advisory Panel RE G U L A R HM King Hussein of Jordan. JY1, talks to RadCorn. Colour. Peter Kirby A R TI C L E S General Manager 65 HF NFD - A Retrospective View Celebrating 60 years of this popular contest. A colour feature. Mike Dennison. G3XDV 12 HF NEWS Managing Editor 76 ISLANDS ON THE AIR AWARD John Forward, G3HTA 16 VHF/UHF NEWS Council Member Neil Lasher. GBHIU 19 QSL Council Member T E C H NI C A L FE A T U R E S Dick Biddulph, G8DPS 20 PROPAGATION Chairman, Technical and Publications 28 NOVICE NOTEBOOK Advisory Committee Ian Keyser, G3R00, introduces a novel idea for using your handheld in 21 IARU Victor Brand, G3JNE1 the shack without risking it falling off the bench. A colour feature. Advertising Agent 24 SWL NEWS 31 A MULTIBAND DOUBLET for 10/18/24MHz. Justine Hodges V C Clear, G3TKN, has designed a neat wire antenna which provides gain 26 CONTEST EXCHANGE Marketing Coordinator on the 'WARC bands'. 34 EUROTEK - ideas from abroad ADVERTISING 29 NOVICE NEWS All display and classified Erwin David has abridged and translated a review of the BEKO 300W advertising enquiries (excepting 144MHz MOSFET amplifier first published in cq-DL. A colour feature. 35 PRODUCT NEWS Members' Ads) should be directed to our advertisement 36 IN PRACTICE agents 73 ORP Victor Brand Associates Ltd.. This month from Ian White, G3SEK: Stocking Your Junk Box • Ordering 'West Barn', Low Common. from Catalogues 5 Tuning and Loading • Drilling Holes. Bunwell. Norwich, 74 EMC Norfolk, NR16 1SY. 39 SIMPLY SILICON: National LMF -100 Tel: 095 378 8473 Fax: 095 378 8437 This chip is an audio filter, with Q. bandwidth and gain programmable with 79 BOOK OF THE MONTH resistors, and offering selectable low, high and band-pass outputs. 79 HELPLINES Radio Communication is published 41 A CALIBRATOR MARKER UNIT by the Radio Society of Great Britain Crystal calibrator circuits are not uncommon. This one, though, has the as lis official journal on the first day 81 CONTEST CLASSIFIED of the relevant month and Is sent tree unusual feature of adding a 'signature' to each set of markers. and post paid to all members of the Society. 52 TECHNICAL TOPICS 85 MEMBERS' ADS Beverage and his 'Wave Antenna' • Compatibility - But With How Much Closing date for contributions, unless otherwise notified, is live weeks prior to Power? • Australian Amateurs on Long Waves • A 14MHz 50/120W 88 CLUB NEWS publication date Valve Amplifier • Flammable Atmospheres, EMC Hazards and Mobile Radio • More on the Direct-Reading Capacitance Meters. 89 RALLIES AND EVENTS it, Radio Society of Great Britain 1993 58 A TWO -METRE SSB/CW TRANSCEIVER: Part three 89 SILENT KEYS Filmset by JJ Typographies Ltd, In this concluding part Bernie Pallett. G3VML, deals with the PA and LPF Unit 4. Baron Court. Chandlers modules, and alignment. PCB/Kit details are included. A colour feature. Way. Temple Farm Industrial 91 AT YOUR SERVICE Estate. Southend-on-Sea, Essex 62 DESIGN OF ACTIVE BUTTERWORTH FILTERS: Part one SS2 SSE In this first part, Dr G Brown, G1VCY. explains the difference between 93 THE LAST WORD Pnntod by Southernprini (Web Offset) theoretical and practical audio filters, and some of their applications. Ltd. Unit 17-19. Factory Road. Upton Industrial Estate, Poole. Dorset. 8H16 68 USER REVIEW: Two views of the SRW CobWebb 94 RSGB BOOK CASE 5SN This unusual multiband aerial was reviewed by Alan Carpenter, G3RQT. 98 INDEX TO FISCH membership Al the same time, we, at RadCom. had a chance to look at it so you have at 31 July 1992: 32,416 two reviews for the price of one! A colour feature. ADVERTISERS RADIO COMMUNICATION June 1993 3 The RadCom Leader RADIO SOCIETY OF GREAT BRITAIN THE NATIONAL SOCIETY WHICH REPRESENTS UK RADIO AMATEURS Founded in 1913 incorporated 1926. Limited by guarantee Member society of the International Amateur Radio Union PATRON: HRH PRINCE PHILIP, DUKE OF EDINBURGH, KG Membership is open to all those with an active interest in radio experimentation and communication as a hobby. Applications for membership should be made to the Membership Services Department from which full details of Society services may also be obtained. Headquarters and registered office: Lambda House, Cranborne Road, Potters Bar, Hens EN6 3JE Telephone: 0707 659015 - Members Hotline and book orders Fax: 0707 645105. Telex 9312 130923 (RSGB) Electronic Mail Via Dialcom/Telecom Gold: 87 C00083 Never a Dull General Manager: Peter Kirby Company Secretary: John C Hall, OBE, G3KVA Moment COUNCIL OF THE SOCIETY PRESIDENT: P E Chadwick. G3RZP EXECUTIVE VICE-PRESIDENT: I D Suart, GM4AUP SOME TIME AGO a friend who I hadn't seen for some IMMEDIATE PAST-PRESIDENT: J T Barnes, GI3USS time asked me about my job as General Manager of HONORARY TREASURER: P D Tucker, G4DWZ the RSGB. I gave what I thought was a fairly good ORDINARY MEMBERS OF COUNCIL explanation of what my duties were and what the E J Allaway. MB. ChB. MRCS, LRCP. G3FKM Society and amateur radio was all about. "Oh", he J Bazley. G3HCT said, "That sounds pretty dull". G L Benbow, Msc, CEng, MIEE, G3HB M HClaytonsmith, G4JKS A few days ago, sitting on a train on my way back to J D Forward, MBIM, G3HTA Potters Bar having attended a meeting at the Science J Greenwell, AMIEE, G3AEZ T I Lundegard. G3GJW Museum, I suddenly thought of this friend. Eur.-Ing. N Roberts, BSc, CEng, MBCS, G4IJF On this particular day, as I said, I was at the Science Museum discussing the future of the Permanent ZONAL MEMBERS OF COUNCIL Zone A: P R Sheppard, G4EJP Special Event Station GB2SM. The RadCom editorial Zone B: J Allen, G3DOT team were also in Central London interviewing HM Zone C: N Lasher. G6HIU King Hussein of Jordan, JY1. The HQ Rally team were Zone D: J G Gannaway, G3YGF Zone E: C Trotman, GW4YKL en route to the Isle of Wight for International Marconi Zone F: I J Kyle, GI8AYZ Day. And the President of the Society, Peter Chadwick, Zone G: I D Suart, GM4AtJP G3RZP, taking advantage of a visit to the USA on ANNUAL SUBSCRIPTION RATES business, was visiting the AR RL. Corporate Members: UK and Overseas (Radio Communication sent by Life working in amateur radio is dull? Never! surface post): £30.00. Airmail rates on request. UK associate member under 18: £15.00. Family member: £12.00 Saturday 1 9 June is a day we are all looking forward Corporate (Concesslonary): £25.00 over 65 or full lime student under to at HQ - Open Day. It's our chance to show you life 25. (Applications should provide proof of age at last renewal date and/or include evidence of student status.) at Lambda House. Since last year's Open Day a lot of Affiliated club or soclety/registered group (UK): £15.00 (including work has been carried out to Lambda House; we now Radio Commmunication). (Subscriptions include VAT where applicable.) have an HQ we can all be proud of.