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To install WSJT 5.9.7 for Windows, first read the material about it in the update history.  Then download the file WSJT597.EXE and execute it to install WSJT.  The default installation directory is C:\Program Files\WSJT6.

Installation of WSJT for Linux or FreeBSD can always be done from the source code, which can be downloaded from the WSJT developers web site at facility is intended mainly for programmers who are knowledgeable about their operating systems and have at least passing familiarity with Python, C, and Fortran. 

Non-programmer users 
can install WSJT on a Debian Linux distribution with the command "apt-get install wsjt", which will install a .deb package put together by Hamish Moffatt, VK3SB.  Users running a Linux distribution that uses rpm-style packages should download and install prepared by Harry Popov, LZ1BB.  This package has been confirmed to work on the Mandriva 2007, Fedora Core 5, and Suse 10.1 distributions.  Harry has also made a convenient package of the WSJT source code, available at .

A step-by-step Tutorial on the use of WSJT 5.9 in its FSK441, JT6M, and JT65 modes is now available.  To use it effectively you must download and install a package of sample WSJT wave files. (22 MB).  For Windows, download and install WSJT_Samples.EXE; for Linux and FreeBSD, WSJT_Samples.tgz.

Thanks to a number of generous volunteers, CD-ROMs of the WSJT installation and tutorial files are available at very low cost for those without high speed internet connections.  If you have problems downloading WSJT or the sample wave files over the internet, click here to find the volunteer in your region and then send an email to enquire about details.

Users with older computers (Windows 98 or earlier, memory less than 256 MB, and/or speed lessthan 500 MHz) may still want to run WSJT 4.9.8.  To install this "traditional" WSJT for the first time, download the file WSJT498.EXE and execute it to install WSJT to a directory of your choice.  Be sure to print and read the WSJT 4.7 User's Guide and the Supplement for Version 4.9, which are included in the distribution, and also the sections for versions 4.7 through 4.9.8 in Update History.

SimJT is a program that allows you to generate JT65 and CW wave files with specified message content, S/N, and other relevant parameters.  It is useful for testing relative sensitivities of these modes under carefully controlled conditions.  Click here to view the SimJT User's Guide.

Source code is available to illustrate details of exactly how a JT65 message is encoded.  Written mostly in Fortran 77, but with a few routines in C, the code can be  compiled  under Linux to produce a command-line program that will encode any JT65 message into channel symbols, ready for transmission by 64-ary FSK .  Download JT65code.tgz (a gzipped tar file) for the source code, which includes a Linux Makefile.  Download JT65code.exe if you just want to play with the executable program for Windows. 

A database containing callsigns, grid locators, and other information is used in various ways within WSJT.  Most WSJT users maintain their own locally relevant copies of this file, which is named CALL3.TXT.  An "all inclusive" version of this file is maintained and updated regularly by Guido Juenkersfeld, DL8EBW. You can update your own information for this file by clicking here.

Current program downloads:

  1. WSJT 5.9.7 installation: WSJT597.EXE     (4.2 MB)

  2. WSJT 4.9.8 installation: WSJT498.EXE     (5.8 MB)

  3. SimJT version 0.9.5       SimJT095.EXE     (0.5 MB)

Archival downloads:

  1. WSJT 3.0 installation:     WSJT300.EXE     (5.7 MB)

  2. Update to v3.8.1:             UPD381.EXE       (0.7 MB)

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This site was last updated 01/19/05