RadCom September 2014, Vol. 90, No. 9

| August 22, 2014

Cover of September 2014 RadCom - Cover image: RSGB President, John Gould, G3WKL operated W100AW at ARRL HQ. Photo: G3WKL

News and Reports

6 RSGB Matters
Including international friendship through amateur radio, volunteer vacancies, exam availability, joiners and rejoiners, QSL matters and congratulations
12 News
All the amateur radio news
14 New Products
The latest news from the amateur market
82 Around Your Region
Our regular round-up of club diaries and news reports

Read this edition online

You will need your RSGB membership login, follow the link below or click the cover image to your right.


22 bhi Dual In-Line Module
The latest 7W stereo/dual channel DSP noise eliminating module examined by Mike Richards, G4WNC
31 FRinder
Giles Read, G1MFG looks at a mobile app that finds repeaters in over 150 countries, shows real-time IRLP status, live EchoLink nodes and much more—it can even program your radio for you with suitable CAT interface hardware
47 Book review
RSGB Yearbook 2015, Callseeker Plus 2015 CD and memory stick plus the Deluxe Logbook and Diary2015 explored by Giles Read, G1MFG
47 Wouxun KG-UV950P quadband transceiver
Mobile 10m, 6m, 2m and 70cm all in one very neat package with 999 memory channels and cross-band operation, writes Richard Staples, G4HGI
76 The Alpha Antenna MicroTune magnetic loop
Steve Nichols, G0KYA finds this portable compact loop antenna has a lot to offer


26 Getting started in… DXing
Chiltern DX Club chairman Dr Chris Duckling, G3SVL explains why DXing is an interesting part of our hobby
36 Youngsters on the Air 2014
Steve Harley, G0FUW describes the YOTA 2014 amateur radio fun in Finland and Wolverhampton
40 RSGB Convention
A look ahead at some of the highlights of October’s flagship event
60 National Hamfest
It’s here! 26 and 27 September sees the biggest National Hamfest yet, organised by Lincoln Short Wave Club in association with the RSGB

Technical Features

16 Coupled resonance antennas
Tom Harrison, GM3NHQ reports on his experiments with parasitic dual band antennas that use passive coupling rather than hard-wiring to operate two resonant elements on different bands
32 Homebrew
Making your own simple equipment to measure RF voltage and power from milliwatts to nearly the full legal limit by Eamon Skelton, EI9GQ
42 Arrival angles of DX signals
Tony Preedy, G3LNP explains how the arrival angle of signals can influence antenna choice
48 Moving On
Investigating a tuned spark transmitter, a DIY Leyden jar capacitor and high-frequency, high power alternators with John Welsh, G0NVZ
58 Design Notes
Andy Talbot, G4JNT continues his look at designing filters with a detailed description of how to come up with a bandpass filter from scratch


91 Advertisers index
68 Antennas, Peter Dodd, G3LDO
74 ARDF, Andrew Soltysik, G4KWQ
46 AT V, Dave Mann, G8ADM
66 GHz Bands, Dr John Worsnop, G4BAO
62 HF, Martin Atherton, G3ZAY
95 IOTA , Col McGowan, MM0NDX
92 Members’ Ads, Rallies and Events, Silent Keys, Special Event Stations
78 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