Practical Wireless 2012-07.pdf

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ISSN 0141-0857
July 2012 £3.75
ISSN 0141-0857
Three from Midland
Dual-band v.h.f./u.h.f. Hand-helds
How to Ident Coils
What's that old coil?
Practical Way
Build a regenerative receiver
Data Modes
Over the waterfall
In Focus
The 2454 Warbreck Squadron
Air Training Corps
Doing it by Design
The development of a noise
bridge
Available Now!
07
The World of VHF
The Olympic Games and VHF/UHF
9 770141 085112
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Practical Wireless July 2012
contents
Volume 88. Number 7. Issue 1262. On sale 14th June 2012
6
Keylines
42 What Next? – Beacons,
Meteor Scatter & Olympics
Restrictions
The Editor discusses his recent and
enjoyable PW Club visit to Wick in Scotland,
‘Olympic Overload’ and offers an invitation to
Amateurs using GQ callsigns.
15
Colin Redwood G6MXL discusses
beacons, brings you the latest up-dates
on disruptions, and details the changes
announced by Ofcom to Amateur Radio
frequency and repeaters due to the Olympic
Games.
7
Readers’ Letters
A selection of your thoughts and ideas from
this month’s mailbag.
9
News
46 Emerging Technology
See what’s new in the world of Amateur
Radio.
Chris Lorek G4HCL, describes how Radio
Amateurs have again been pioneering
advances in emerging professional two-way
radio technology
18
15 Three v.h.f./u.h.f. Rigs from
Midland
50 In Vision
Tim Kirby G4VXE , the PW v.h.f. specialist
author takes a look at three rigs from
Midland – familiar to everyone who has used
CB radio – but new to the Amateur Radio
market.
In his c olumn, this month Graham Hankins
G8EMX tells of the last two analogue TV
areas, an idea for Amateur ‘broadcasts’ and
the CQ-TV magazine from the BATC.
18 Remembering a Classic QRP
Project
52 The World of VHF – The Olympic
Games and VHF/UHF
24
This month the Rev. George Dobbs G3RJV
takes a look at a classic project and reflects
on the fact he – and many of us! – are
analogue type constructors but he’s not
being pessimistic!
It’s inevitable that the Olympic Games
organisational requirements would end up
creeping into PW – and Tim Kirby G4VXE
explains in details how Amateur Radio v.h.f.
operating in the UK will be affected.
24
What’s all The Noise about?
56 Old RF Coils and How to Identify
Them
In his bi-monthly Doing it By Design
column, Tony Nailer G4CFY outlines the
development of his noise bridge.
That’s the suggestion from Stef
Niewiadomski – our keen constructor
author. Stef then describes how readers can
discover just what that old coil is!
30
30 In Focus – The 2454 Warbreck
Squadron Air Training Corps
62
Catching Up With QSLs
Brian Nuttall M0OYG describes how his
Air Training Corps Squadron in north west
England is busy training Air Cadets in radio
communications.
Carl Mason GW0VSW presents his round
up of your activities on the bands and
provides the news on the DXing scene.
36
32
Valve & Vintage
68
Bargain Basement
The traditional brown dustcoat he’s wearing
announces it’s Phil Cadman G4JCP
manning the PW vintage ‘shop’ this month!
69
Classified Adverts
70
Traders’ Tables
72
PW Publishing Bookstore
76
Subscriptions
36
Over the Waterfall!
77
Topical Talk
Mike Richards G4WNC has some typical
waterfall displays of data transmissions,
and finds a way of linking an SDR to your
decoding software!
Front cover design by Steve Hunt.
56
Copyright © PW PUBLISHING LTD. 2012. Copyright in all drawings, logos, photographs and articles published in Practical Wireless is fully protected and reproduction in whole or part is expressly forbidden. All reasonable precautions are taken by
Practical Wireless to ensure that the advice and data given to our readers are reliable. We cannot however guarantee it and we cannot accept legal responsibility for it. Prices are those current as we go to press.
Published on the second Thursday of each month by PW Publishing Ltd., Arrowsmith Court, Station Approach, Broadstone, Dorset BH18 8PW. Tel: 0845 803 1979. Printed in England by Holbrooks Printers Ltd., Portsmouth P03 5HX. Distributed by
Seymour, 2 East Poultry Avenue, London EC1A 9PT, Tel: 020 7429 4000, Web: http://www.seymour.co.uk. Sole Agents for Australia and New Zealand - Gordon and Gotch (Asia) Ltd.; South Africa - Central News Agency. Subscriptions INLAND £42,
EUROPE £51, REST OF WORLD £61, payable to Practical Wireless, Subscription Department. PW Publishing Ltd., Arrowsmith Court, Station Approach, Broadstone, Dorset BH18 8PW. Tel: 0845 803 1979. Practical Wireless is sold subject to the
following conditions, namely that it shall not, without written consent of the publishers first having been given, be lent, re-sold, hired out or otherwise disposed of by way of trade at more than the recommended selling price shown on the cover, and
that it shall not be lent, re-sold, hired out or otherwise disposed of in a mutilated condition or in any unauthorised cover by way of Trade, or affixed to or as part of any publication or advertising, literary or pictorial matter whatsoever. Practical Wireless
is Published monthly for $50 per year by PW Publishing Ltd., Arrowsmith Court, Station Approach, Broadstone, Dorset BH18 8PW, Royal Mail International, c/o Yellowstone International, 87 Burlews Court, Hackensack, NJ 07601. UK Second Class
Postage paid at South Hackensack. Send USA address changes to Royal Mail International, c/o Yellowstone International, 2375 Pratt Boulevard, Elk Grove Village, IL 60007-5937. The USPS (United States Postal Service) number for Practical Wireless
is: 007075.
5
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