RadCom January 2013, Vol. 89, No. 1

| January 1, 2013

Cover of January 2013 RadCom - Richard Byford, G4MKR, demonstrating amateur radio at the NRC.  Photo: RSGB

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.

RadCom has the largest amateur radio readership in the UK and is respected throughout the world.

To read this edition online, click the cover or follow this link.

You will need to enter your RSGB Members’ Area login, and have Adobe Flash installed on your computer.

Contents RadCom January 2013

News and Reports

  • 6 News
    All the amateur radio news
  • 9 RSGB Matters
    Including Society matters, EGM results, 2013 Board and Presidential elections, New Members and Congratulations
  • 12 RSGB Centenary
    Details of the exciting programme of events for the RSGB Centenary Year
  • 80 Around Your Region
  • 91 Contacts
    All the contact information for the RSGB including Committees and Regional Managers


  • 36 Elecraft KPA500
    Peter Hart, G3SJX is impressed by this solid-state amplifier that effortlessly delivers 500W from 26-38W of drive
  • 52 Super Antenna MP1B Superstick
    A very well made, compact portable antenna for 10m-40m and, optionally, 80m, writes Steve Nichols, G0KYA
  • 54 Book Review
    Our top three favourite books of 2012

Technical Features

  • 18 Homebrew
    Eamon Skelton, EI5GQ designs a VFO amplifier and bandpass filter for the 40m direct conversion receiver project
  • 34 Design Notes
    Andy Talbot, G4JNT explains almost everything you need to know about frequency calibration and standards, including how to get within 0.01Hz at 10GHz
  • 42 Folding 2m Yagi
    A chance purchase at a car boot sale led Eric Lake, 2W0WXM to design a versatile portable antenna
  • 65 Start Here
    More on the Tesla coil project by John Welsh, G0NVZ
  • 68 A virtual laboratory
    Richard F Gillette, W9PE explains how a spreadsheet can demonstrate how mixers, modulators and product detectors work


  • 14 RSGB Convention 2012
    Elaine Richards, G4LFM asks if this was the best-ever Convention
  • 22 Planning
    Planning Advice Committee chairman Stephen Purser, G4SHF explains how the Four Year Rule can be your friend
  • 23 ‘Spectrum Release’ and amateur radio
    Murray Niman, G6JYB looks at the pressures on amateur allocations in the UHF ‘sweet spot’
  • 26 All aboard for GB175PO
    P&O Ferries gave British and French amateurs unprecedented access to the ferry Spirit of Britain to celebrate their 175th anniversary with special event stations, explains Erwin David, G4LQI
  • 30 Getting started in… Repeaters
    Colin Dalziel, GM8LBC explains the ins and outs of these very useful community relay stations.
  • 40 AMSAT Colloquium 2012
    Elaine Richards, G4LFM learns more about amateur satellites and the work behind their construction
  • 64 RSGB Archives
    The National Radio Centre library houses over a century of history that is well on the way to being catalogued, writes Elaine Richards, G4LFM
  • 66 A standard for powerline telecommunications devices
    Chairman of the RSGB EMC Committee Dr John Rogers, M0JAV explains the RSGB involvement in the standard that was recently passed for EU-wide implementation
  • 78 The CDXC DX archive
    Alan Jubb, 5B4AHJ explains how back issues of this venerable publication are providing an invaluable information resource for Club Log today


  • 87 Advertisers index
  • 24 Antennas, Peter Dodd, G3LDO
  • 75 ARDF, Bob Titterington, G3ORY
  • 46 ATV, Roy Powers, G8CKN
  • 61 GHz Bands, Dr John Worsnop, G4BAO
  • 55 HF, Don Field, G3XTT
  • 88 Members’ Ads, Rallies and Events, Silent Keys, Special Event Stations
  • 39 Propagation, Gwyn Williams, G4KFH
  • 90 QSL matters
  • 73 Sport Radio, Steve White, G3ZVW
  • 92 The Last Word
  • 58 VHF/UHF, Richard Staples, G4HGI


  • 41 Yaesu YA-30 broadband HF antenna
    A very special price on this high quality folded dipole that covers 1.9-30MHz without gaps – and at a VSWR of less than 2.5:1


Due to an editorial error, figure 1 and figure 2 on page 42 of the January 2013 RadCom are incorrect. Revised versions of the figures can be found at http://www.rsgb.org/main/membersonly/publications/radcomplus/Folding_Yagi_Errata_Jan_2013.pdf (1-page/20KB PDF – Members login required). The editorial team apologises for any inconvenience these errors may have caused.

Category: RadCom