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Ham radio contest logging program
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A ham radio contest logging program incorporating software-defined radio (SDR) spectral displays. Runs under Linux and Windows. Version 2 has two separate executables: 1) so2sdr, the logging program and 2) so2sdr-bandmap, the SDR spectral display. So2sdr-bandmap can be used separately from so2sdr.

Copyright 2010-2019 R. Torsten Clay N4OGW


  • 06/08/2018 support ARRL June VHF contest
  • 04/05/2018 support Mississippi qso party
  • 02/18/2018 lots of code updates; Qt4 support dropped- you must now use Qt5
  • 12/02/2016 support for voice keyer using sound card

Install instructions (Linux)

You will need the following development libraries installed: Qt (version 5), FFTW, Hamlib, and PortAudio. Other various development packages include g++, Git, and pkg-config.

  1. Clone the git repository to your local machine:
    git clone git://

or download one of the source code distributions and extract it:

    tar xzvof so2sdr-2.4.0.tgz
  1. By default, so2sdr will be installed in /usr/local/bin, and associated data files will be placed in /usr/local/share/so2sdr. If you want to change the location of the program, edit SO2SDR_INSTALL_DIR in common.pri

  2. qmake

  3. make

(make -jx will use x cores and go faster)

N.B. Subdirectory Makefiles will be created from the top level Makefile.

  1. (as superuser) make install

  2. Test and contribute!

Additional help is available in the file share/so2sdrhelp.html or via the Help menu in the program.

Torsten Clay

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