Program Development

Program Development

Operating Systems

WSJT, MAP65, WSPR, WSPR-X, and WSJT-X can be compiled for Windows, Linux, FreeBSD, Macintosh OS X, and most other UNIX-like operating systems. The download links on pages for each program retrieve pre-compiled installation packages for Microsoft Windows, and in some cases also for Ubuntu and other Debian-based 32-bit Linux distributions.  Users of other operating systems or distributions must compile the programs from source code. 

Source Code

WSJT, MAP65, WSPR, WSPR-X, and WSJT-X are open source programs distributed under terms of the GNU General Public License. Source code for SimJT is available on request.  KVASD (a soft-decision Reed Solomon decoder for the JT65 mode) is distributed only in executable form because of licensing restrictions.

The graphical user interfaces (GUIs) for WSJT and WSPR are written in Python.  Most of the number-crunching in these programs is done in Fortran, and some system-level functions are implemented in C.

Version 2 of MAP65, WSPR-X, and WSJT-X represent the most recent shift in WSJT-related programming practices.  The GUIs for these programs are written in C++ using the open-source Qt framework.  As with WSJT and WSPR, most of the number-crunching is done in Fortran.

Anyone interested in the communication problems addressed by WSJT, MAP65, WSPR, WSPR-X, and WSJT-X is invited to study, adapt, modify, or enhance the code and contribute to further development of the programs.  Source code is maintained under the version control program Subversion in a public open-source repository at SourceForge. For updates and other information on the continuing development of WSJT, MAP65, WSPR, WSPR-X, and WSJT-X you are invited to subscribe to the WSJT developers email list.

Explicit Downloading Instructions

Present and past versions of the source code for WSJT, MAP65, MAP65-IQ, and WSPR may be downloaded by using svn commands.  For example, the latest revisions of source code for can be "checked out" with the commands

svn co svn://
svn co svn://
svn co svn://
svn co svn://
svn co svn://

You will need to understand svn in order to use the source-code repository effectively.


Further information on compiling WSJT and its sister programs is available in the WSJT Developer's Guide.


The soft-decision Reed-Solomon decoder used in WSJT, WSJT-X, and MAP65 is based on an algorithm developed by R. Koetter and A. Vardy and protected under United States Patent number 6,634,007.  It uses code licensed from CodeVector Technologies, LLC.

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