RadCom September 2012, Vol. 88, No. 9

| September 6, 2012

Cover of September 2012 issue of RadComRadCom is the Radio Society of Great Britain Members’ magazine and is sent free every month to Members of the Radio Society of Great Britain.

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Contents RadCom September 2012

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News and Reports

  • 6 RSGB Matters
    Including Society matters, Olympic updates, Volunteer vacancies, QSL Matters, Contest Rules Consultation, New Members and Congratulations
  • 12 News
    All the amateur radio news
  • 24 Half Year Accounts
    Unaudited income and expenditure account for the six months ending 30 June 2012
  • 80 Around Your Region
    Club news and planned events around the country


  • 66 YouKits FG-01 Antenna Analyser
    A real pleasure to use, writes Mike Richards, G4WNC
  • 71 Book Review
    Giles Read, G1MFG looks at Low Power Communication and EME 2012 Conference Papers

Technical Features

  • 18 Homebrew
    Back to basics with a look at crystal sets by Eamon Skelton, EI5GQ
  • 32 Design Notes
    Andy Talbot, G4JNT continues his look at small LF antennas and introduces some reader feedback topics
  • 36 Transformer Feedback Amplifiers
    Transformer feedback amplifiers are valuable when designing high dynamic range receivers, writes Chris Trask, N7ZWY
  • 44 Collapsible 6m 2-ele beam
    Ideal for portable use, this design by Mike Parkin, G0JMI folds into a compact shape for transport and storage
  • 62 Technical Feedback
    Following a recent EMC column report, Roger Alexander, 2E0WWZ explains how he chose LED lighting carefully for his RAYNET requirement and experiences no RFI problems


  • 14 RSGB Convention
    A look ahead to next month’s world-class event
  • 26 British Inland Waterways on the Air
    Reports from around the country on the 2011 and 2012 events, collated by John Rogers, M0JAV
  • 30 National Hamfest
    With just six weeks to go, excitement mounts – here’s what to expect at the Notts and Newark Showground on 28 and 29 September
  • 52 75th Commonwealth Contest
    Bob Whelan, G3PJT reports on all of 2012’s stormy action
  • 64 Tower Technology
    Elaine Richards, G4LFM learns all about building and refurbishing mobile masts at Upshot UK


  • 22 Antennas, Peter Dodd, G3LDO
  • 75 ARDF, Bob Titterington, G3ORY
  • 16 ATV, Roy Powers, G8CKN
  • 60 GHz Bands, Sam Jewell, G4DDK
  • 55 HF, Don Field, G3XTT
  • 87 Members’ Ads, Rallies and Events, Silent Keys, Special Event Stations
  • 78 Propagation, Gwyn Williams, G4KFH
  • 73 Sport Radio, Steve White, G3ZVW
  • 92 The Last Word
  • 58 VHF/UHF, David Butler, G4ASR


  • 67 Special Offer – Save money on a YouKits FG-01 Antenna Analyser


In the 75th Commonwealth Contest article on pages 52-54 we mentioned that Peter, G3PHO reached second place in the restricted section of the contest. We omitted to show the callsign he used in the contest – 9H3C – from his location on Gozo Island (IOTA EU-023). Other Commonwealth Contest travellers were ZD7XF (= G3TXF), J88DR (= G3TBK), C56XA (= G3XAQ) and J79SZ (= G7SOZ).

Information for RadCom readers


© 2012 Radio Society of Great Britain. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the Radio Society of Great Britain.

Errors and Omissions

Whilst the Radio Society of Great Britain—the publisher—takes all reasonable care in the production of RadCom, we can accept no responsibility for errors, inaccuracies or omissions contained within the magazine or any subsequent loss arising from any use thereof. Reliance placed on the contents of RadCom is at the reader’s own risk. We urge any reader to take all precautions appropriate to avoid any loss or damage to equipment and ensure the personal safety of themselves and others when using material contained in RadCom. It should be also noted that patent or copyright protection may exist in relation to any items within this magazine. The RSGB does not accept any responsibility for failing to identify any such patents, copyright or any other protection.

Readers are also reminded that the use of radio transmission and reception equipment—including scanning—is subject to licensing and the erection of external aerials may be subject to local authority planning regulations.


Although RSGB staff and the staff of Danby Advertising—its Advertising Agent—take reasonable precautions to protect the interests of readers by ensuring as far as practicable that advertisements in the pages of RadCom are bona fide, the magazine and its publisher, the RSGB, cannot accept any undertaking in respect of claims made by advertisers, whether these advertisements are printed as part of the magazine, or are in the form of inserts. Under no circumstances will the magazine accept liability for non-receipt of goods ordered, late delivery, or faults in manufacture. Legal remedies are available in respect of some of these circumstances, and readers who have complaints should address them to the advertiser or should consult a local Trading Standards Office, a Citizens’ Advice Bureau, or their own solicitors. The publishers make no representation, express or implied, that equipment advertised conforms with any legal requirements of the Electromagnetic Compatibility Regulations 1992. Readers should note that prices advertised may not be accurate due to currency exchange rate fluctuatons, or tax changes.

Category: RadCom