RadCom July 2015, Vol. 91, No. 7

| June 19, 2015


We apologise for any disappointment

This edition is currently being converted to our HTML5 online viewer, which will bring enhanced readability, download speed and picture quality

Cover image: Assembling the MW0JZE seven-band wide-spaced Hexbeam. Photo by Steve Nichols, G0KYA

News and Reports

6 RSGB Matters
Including a report on Dayton, new Board liaison roles, volunteer spotlight, new SDR receivers at NRC, RadCom Basics and RadCom Plus news, Contest Committee white paper, Legacy Trust vacancies, 2016 AGM location, Construction Competition, QSL matters, RSGB helping YOTA Italy, congratulations and welcome
13 News
All the amateur radio news
45 New Products
The latest news from the amateur and technical market
81 Around Your Region
Our regular round-up of club diaries and news reports

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19 SPE Expert 1.3K-FA linear amplifier
Peter Hart, G3SJX is impressed by an all-in-one that puts out 1.3kW of solid state power for HF and 6m plus 500W on 4m yet weighs just 9.5kg including PSU and internal auto ATU
38 MW0JZE seven-band wide-spaced Hexbeam
Flexible—in more ways than one—40m-6m antenna reviewed by Steve Nichols, G0KYA
57 Peak test equipment
Andy Talbot, G4JNT gets to grips with the Peak Atlas ZEN50 intelligent Zener diode tester and a SOT23 test adapter
59 Book review
Giles Read, G1MFG is intrigued by Second World War Secret Bunkers and Churchill’s School for Saboteurs


16 Supporting young people in technology
Barry Maxwell and Steve Hartley, G0FUW look at the work of the Radio Communications Foundation and The Arkwright Trust
33 Project DX15
Young radio amateurs will mount a DXpedition to Wales in July, writes Mike Jones, 2E0MLJ
36 Operating from Sandy Islet
Cezar Trifu, VE3LYC shares the story of the first ever IOTA activation of Sandy Islet, OC-294—the last unactivated group in Australia
46 RSGB Convention
A look forward to the 9-11 October RSGB Convention and the latest news on the five lecture streams
48 International Marconi Day
The 28th annual event took place in April, writes Elaine Richards, G4LFM
53 British Science Week
Reports from around the country on how amateur radio clubs demonstrated their magic to the public, young and old

Technical Features

25 Homebrew
Tx/Rx switching and local oscillators for the 10m transceiver project by Eamon Skelton, EI9GQ
30 Masts and hoisting systems
Robert Dancy, G3JRD explains his method of creating and raising an antenna mast
34 Moving On
The first of a two-part look at circular polarisation by John Welsh, G0NVZ
42 An Arduino-based receiver noise figure alignment aid
Barry Chambers, G8AGN explains his nanowave optimisation device that also has applications in RF
76 Design Notes
Andy Talbot, G4JNT takes a good look at accurate directional couplers and SWR bridges
80 Ferrite coupled loop antennas
A round-up of experiments with ferrite coupling to loops by Ben Edginton, G0CWT


91 Advertisers’ index
68 Antennas, Peter Dodd, G3LDO
74 ARDF, Bob Titterington, G3ORY
24 ATV, Dave Mann, G8ADM
66 GHz Bands, Dr John Worsnop, G4BAO
60 HF, Martin Atherton, G3ZAY
93 Members’ Ads, Rallies and Events, Silent Keys, Special Event Stations
92 Propagation, Gwyn Williams, G4KFH
72 Sport Radio, Steve White, G3ZVW
96 The Last Word
64 VHF/UHF, Richard Staples, G4HGI

Category: Front Page News, RadCom, RSGB Notices