RadCom December 2013, Vol. 89, No. 12

| November 27, 2013

Cover of December 2013 RadCom - Merry Christmas to all Members.  Image: Kevin Williams, M6CYB

RadCom is the Radio Society of Great Britain Members’ magazine and is sent free every month to Members of the Radio Society of Great Britain.

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Contents RadCom December 2013

News and Reports

  • 6 RSGB Matters
    Including Christmas greetings from the President, new unified Emercomms organisation, Presidential, Board and Regional Manager vacancies, Centenary Construction Competition results, QSL matters, congratulations and newcomers.
  • 10 News
    All the amateur radio news
  • 12 Centenary News
    Latest news of the RSGB Centenary celebrations
  • 56 RadCom 2013 Index
  • 82 Around Your Region
    Clubs news and planned events around the country

Members’ Special Offer


  • 40 XROYG On the Air
    John Warburton, G4IRN describes the recent CW DXpedition to Easter Island
  • 77 G100RSGB
    More tales of how clubs have been enjoying the RSGB Centenary Callsign


  • 14 Yaesu FT-252E 2m handheld
    Yaesu tackles cheap imports on their own terms whilst maintaining customer support levels writes Giles Read, G1MFG
  • 23 Zeus ZS-1 HF SDR transceiver
    Mike Richards, G4WNC is impressed by this fully digitised SDR transceiver with general coverage
  • 60 Innovantennas 20/15/10 DESpole
    A three-band rotatable dipole with dropped vertical sections to reduce the turning circle reviewed by Steve Nichols, G0KYA
  • 77 Book Review
    Giles Read, G1MFG gives the low down on the third edition of LF Today and is fascinated by Cold War Secret Nuclear Bunkers

Technical Features

  • 16 Moving On
    John Welsh, G0NVZ looks at capacitive and inductive aerial loading
  • 18 Homebrew
    Finishing off the UHF transverter and starting a new sub-4MHz transceiver with Eamon Skelton, EI9GQz
  • 30 Operating on 472kHz
    LF guru Mike Dennison, G3XDV explores the delights of our newest frequency allocation
  • 36 Design Notes
    Are PIN diodes the ideal RF switch, asks Andy Talbot, G4JNT
  • 42 Shortening, Shortening
    Ron Mount, G7DOE explains why the ‘ideal’ dipole length isn’t really right
  • 44 DVB-T Stick as SDR
    You can start playing with software defined radio from VHF to microwaves for under £10 explains Clive Ousbey, G0CHO
    92 Data
    Andy Talbot, G4JNT responds to his bumper postbag
    58 EMC
    More on ADSL/VDSL unwanted emissions by Dr David Lauder, G0SNO


  • 91 Advertisers index
  • 34 Antennas, Peter Dodd, G3LDO
  • 70 GHz, Dr John Worsnop, G4BAO
  • 64 HF, Martin Atherton, G3ZAY
  • 56 LF, Dave Pick, G3YXM
  • 95 Propagation, Gwyn Williams, G4KFH
  • 27 QRP, Rev. George Dobbs, G3RJV
  • 93 Members’ Ads, Rallies and Events, Silent Keys and Special Event stations
  • 74 Sport Radio, Steve White, G3ZVW
  • 96 The Last Word
  • 68 VHF/UHF, Richard Staples, G4HGI

Category: RadCom