RadCom May 2014, Vol. 90, No. 5

| April 25, 2014

Cover of May 2014 RadCom - G8LES in his extraordinarily well-equipped ATV shack. Image: Courtesy of Create Media Partners

News and Reports

6 RSGB Matters and News
Including the new Construction Competition, extra opening days plus a WS19 for the NRC, important changes at 13cm and 9cm plus QSL and other news
70 Keeping up to date
How did you do in our quiz?
82 Around Your Region
Club news and planned events around the country

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24 Crazy Daisy
An unconventionally shaped magnetic loop antenna that takes just minutes to erect and enables an amateur with little space to get on the air, writes Steve Nichols, G0KYA
59 Book Review
Two excellent antenna books reviewed by Giles Read, G1MFG
76 Rock-Mite QRP transceiver
Ron Stone, GW3YDX reviews a neat 40m crystal controlled radio kit designed by Small Wonder Labs


31 Insurance
Insurance is paramount in many people’s minds right now thanks to the winter floods and Julian Dent of South West Broking answers some common questions
57 Youngsters on the Air
RSGB Training and Education Committee chairman Steve Hartley, G0FUW profiles the young RSGB Members and the Team Leader chosen for the YOTA Summer Camp in Finland
68 British Wireless for the Blind Fund
Frances Fielding of BWFB explains the Fund’s history and looks at the equipment it has provided over the years from the first crystal sets to the latest internet radio device

Technical Features

13 A new design of broadband HF vertical antenna (part 1 of 2)
Martin Ehrenfried, G8JNJ describes the background and development of a new type of efficient, omnidirectional broadband vertical antenna that requires no tuner
18 Homebrew
Eamon Skelton, EI9GQ works on the RF power amplifier for his LF/MF transceiver project
27 Tooling up the TS-50 for CW
Retrofitting a better crystal filter can greatly improve the performance of this venerable radio, as Gary Cobb, G3TMG explains
32 Getting started in test equipment
Dave Pick, G3YXM looks at the different kinds of test equipment likely to be useful around the amateur shack
40 Push pull amplifiers
A detailed look at series and parallel output configurations and the influence of harmonics by Paul Brooking, G4SHH
48 Moving On
John Welsh, G0NVZ explains the electrochemistry of the lead-acid battery
56 Design Notes
Controlling a direct digital synthesizer and a novel way of adding FM to a microwave transmitter by phase modulating the reference frequency, all explained by Andy Talbot, G4JNT


91 Advertisers’ index
36 Antennas, Peter Dodd, G3LDO
74 ARDF, Bob Titterington, G3ORY
30 ATV, Dave Mann, G8ADM
66 GHz Bands, Dr John Worsnop, G4BAO
62 HF, Martin Atherton, G3ZAY
22 IOTA , Col McGowan, MM0NDX
92 Members’ Ads, Rallies and Events, Silent Keys, Special Event Stations
78 Propagation, Gwyn Williams, G4KFH
79 RSGB Contacts
72 Sport Radio, Steve White, G3ZVW
96 The Last Word
64 VHF/UHF, Richard Staples, G4HGI

Category: RadCom