Amateur Radio Contest Logging Software

Updated : 25 November 2015

What's New

HF Contests Supported


Download SD

For Windows - XP, Vista, 7, 8, 10


SD Manual
English PDF
Italian PDF - I7ALE

The SD-User Mailing List - Get help from other users.

WA7BNM's Contest Calendar.

SM3CER's Contest Service.

3B7C - My Story
The ARRL at 100
Hunting in Africa
What I don't like
Excessive Bandwidth
The Internet of Things
DXCC and the AIRL
Hybrid Contesting
The Wild West
New RBN Servers
Far, far away
A Bitter Pill
Remote Contesting
Internet Propagation
Clicking & Pouncing
CW Skimmer
New Technologies
Remote Control
Put the wires back
Remote Contesting
Hybrid Communications
Reality Check
Remote Operation
Parallel Radio
Ceased to Exist
We should not be here
Digital Mode One
Copy by Ear
I'd recommend Skype
Just Another Digital Mode
Allow all Technology
QSOs & Thoroughbreds
Field Day & the Internet
SD Updated April 2010
New Contest Categories
Remote Control 2009
eHam NA4M & N2MG

SD is written in PowerBASIC

Conor O'Kane DroneSwarm for iPad
Fossil Swap for iPad

Dermot O'Kane

Download latest .CTY Files.

SCP Super Check Partial files.

ARRL's Logbook
of the World

USA/Canada International paper sizes.

IRTS - Irish Radio Transmitters Society

Begali HST Mk II - the best single-lever paddle.

Begali HST Mk II

Birds of Saint Brandon 3B7C

Fairy Tern - EI5DI

"A great program. Keeping it simple is both the hard part and its greatest virtue." K1CTT, March 2014.

SD sets the standard for fast, simple logging and editing in the major international contests and in dozens of others worldwide. It is intended for single-op unassisted entries, on both SSB and CW.

SD runs on all versions of Windows, from XP to Windows 10, with a character-based display.


Here is the logging line for CQ WW, with W3LPL typed in the callsign field.

  • We're logging on 40m, and the time is 15:14z
  • This is QSO #646
  • If logged, W3LPL will be a country mult (C), and a zone mult (Z)
  • This will be our third (3) QSO with W3LPL
  • The received report defaults to 599
  • The zone previously logged (5) is pre-filled
  • Our data entry mode is OVR, and mode is CW
  • The band/mult analysis shows that -
    • W3LPL has been worked on 10 and 20m
    • He is needed on 15m, but will not be a mult on that band
    • He is needed on 80 and 160m, and would be a double mult on both bands

SD is not free. When you register (20 euros) you get a key file registered to your callsign. The key file activates the current version of SD and all future versions released within 12 months. Unregistered versions run in Demo mode, with a delay of 30 seconds in logging QSOs after the first 10 QSOs in each contest log.

    SD - HF Contests, more than 250 templates supplied.
    SDV - Many VHF Contests

SD supports rig control, serial and parallel keying - and integrates with WinKey to eliminate CW timing issues caused by Windows. microHAM's USB CW Keyer offers WinKey and level converters for rig control in a single package.

SD offers instant "full-screen" editing of any QSO in your log. All SD's files, including the log, are standard ASCII text files and can be viewed with any text editor.

Following any QSO edit, no matter how complex, SD checks your complete log for consistency, and instantly updates all relevant QSOs.

This includes setting and unsetting dupe and multiplier flags, and updating area codes (zones), and points, in all QSOs as required. The information shown in the Summary Score window is correct at all times. Just try this on any other contest logger - and see the difference for yourself.

SD is the only contest logger to offer these features, in real-time, as you type individual callsign characters. There's no need to touch another key or memorise Ctrl-This or Alt-That.

  • Dupe checking
  • Country/Band analysis
  • Check Partial by prefix
  • Beam headings
  • Advance flagging of potential multipliers
  • Band/Mode analysis by callsign
  • Linked database display
  • Auto data insert (Zones and area codes)
  • Countries Worked/Wanted by Continent

      Download SD Get SD

IOTA Contest

SD supports the IOTA contest directly, and includes all the custom features that make it so efficient compared to other loggers. To do well in IOTA, you must work island stations because they're worth many times more than other QSOs. For the first fourteen years of the IOTA contest, from 1993 to 2006 inclusive, SD was the leading logger. Here are the recent stats.

SD sets the standard for instantly showing your band/mode status for island stations, for highlighting multiplier slots, and for ease of data entry of island references. Other loggers can't do this! IOTA is special, it needs the special features that only SD offers.

SD identifies country and call-area, as you type individual callsign letters, and give you a real-time analysis of IOTA islands (if any) worked and wanted for that country or call-area - for the current band and mode. When the country is an IOTA island with a single reference, SD auto-fills the reference.

SD gives you a worked/wanted analysis for all bands and modes when you type an IOTA reference in the callsign field - there's no need to touch another key or remember function keys or multiple keystrokes.

SD is ready now for the 2015 IOTA Contest

      Download SD Get SD

IOTA Contest Results

2014 : 2013 : 2012 : 2011 : 2010 : 2009 : 2008 : 2007 : 2006 : 2005 : 2004 : 2003 : 2002 : 2001 : 2000 : 1999 : 1998 : 1997 : 1996 :

Soapbox comments about SD/SDI for -
2011 : 2010 : 2009 : 2008 : 2007 : 2006 : 2005

VHF Contests

SDV (SD for VHF) is free. No other contest logger correctly tracks district, country and locator square multipliers in RSGB and other VHF contests in the UK and Ireland.

      Download SDV Get SDV

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    Paul O'Kane EI5DI