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RadCom

RadCom is sent free every month to Corporate Members of the Radio Society of Great Britain. It has the largest amateur radio readership in the UK and is respected throughout the World. Subscribe, Back numbers, Binders and CD-ROMs Maximise Your Company's Profits: Click Here to find out how to place display and classified advertising in RadCom (Note: this document is a PDF file that opens in its own window) JULY 2008, Vol. 84, No. 7 News and Reports 6          RSGB Matters Colin Thomas continues with his thoughts for the future 8          News All the amateur radio news 11        Club News
Features 14        GB3BS Mat Alard, G7FBD, talks about solving problems with key fobs whilst maintaining a 70cm repeater service 68        Dayton Hamvention 2008 All the news and details of the new products launched at the world's largest amateur radio show Technical features 18        Homebrew Heatsinks, thermal design and a QRO MOSFET linear amplifier by Eamon Skelton, EI9GQ 24        An Experimenters Power Amplifier Phil Harman, VP6APH takes a building-block HF amplifier and makes it bomb-proof for use with his other experiments 42        SDR Steve Ireland, VK6VZ and Phil Harman, VK6APH look at clocking quadrature switching detectors 52        Short Circuits Andy Talbot, G4JNT looks at power supplies, phase comparators and solid state relays Reviews 56        Alinco DJ-V17 Chris Lorek, G4HCL looks at this water resistant 2m handheld. 58        The Peter Hart Review Peter Hart, G3SJX looks at the Elecraft K3 HF & 50MHz transceiver. 79        Book Review A new circuit building book and two books for the aircraft enthusiast on special offer to members Regulars 80        Antennas, Peter Dodd, G3LDO 65        ATV, Trevor Brown, G8CJS 84        Club Calendar 40        GHz Bands, Sam Jewell, G4DDK 34        HF, Don Field, G3XTT 76        In Practice, Ian White, GM3SEK 88        Members Ads, Silent Keys, Rallies & Events, GB Calls and Congratulations 44        Portable, Richard Newstead, G3CWI 86        Propagation, Gwyn Williams, G4KFH, Helplines 72        Sport Radio, Tim Kirby, G4VXE 92        The Last Word 38        VHF/UHF, Norman Fitch, G3FPK 54        Whatever Next, Steve White, G3ZVW

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Copyright Radio Society of Great Britain, 2006. 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.

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©2008 Radio Society of Great Britain
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