This is the WSJT Home Page by K1JT ©

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Last update July 26. 2010
European mirror is part of

More than 100 DXCC countries already known to be active in WSJT

WSJT is the name of a computer program.  It stands for ''Weak Signal communication, by K1JT.''  The program currently supports four principal modes:
, designed to support communication using very brief “pings” from meteor trails in the ionosphere;
JT6M, also for meteor scatter, but especially optimized for the 6-meter band;
JT65, ideal for extremely weak but slowly varying signals such as those found on troposcatter and Earth-Moon-Earth (EME) paths; and the
EME Echo mode for detecting and measuring your own echoes from the moon.  The program also offers a Measure mode for testing Sun noise and the like, and an EME Calculator to help you estimate the strength of your own and other stations’ echoes from the moon.  If you have a desire to study the internal workings of WSJT and perhaps contribute to its development, a package of the critical source code is now available.
WSPR (pronounced "whisper") stands for "Weak Signal Propagation Reporter."  This program  implements transmitting and receiving for a digital soundcard mode usable with extremely wesk signals.
FAQ: Go to the WSJT/JT65 Forum and BBS (jetzt auch, auf vielfachen Wunsch, in Deutsch!)

Curent full version for state of the art machines: WSJT v. 7.07 July 26th 2010
Current WSJT beta: WSJT 8.0 [several major changes!]
Current WSPR version : 2.0  

[May. 05.. 2007] Version 5.9.7 released [Download area]
[July 26. 2010] WSJT 7.07 [Download]
[Nov. 19. 2009] WSPR 2.0 [Download]
[June 19. 2010] WSJT 8.0 beta [Download] Users guide, read carefully! [Download]

You will need to know something about how the new decoder works in order to make the best use of it, please read [updates.htm]. A step-by-step Tutorial on the use of WSJT 5.9.0 in its FSK441, JT6M, and JT65 modes is now available here.
Is JT65 really the right choice for a valid QSO's on EME? Read what DJ5HG and SM2CEW wrote about the "deep search mode"[which is implemented in WSJT] and what this mode really does.

Download area:

(Your browser may want you to hold the shift key down when you click, to trigger a download.)

WSJT597.EXE Download this file to install the version 5.9.7  If you already have WSJT 3.x or 4.x installed, I suggest that you use a new installation directory. The default new directory is C:\Program Files\WSJT6.

Installation of WSJT for Linux or FreeBSD must presently be done from the source code, which can be downloaded from These versions are intended mainly for programmers who are knowledgeable about their operating systems and have at least passing familiarity with Python, C, and Fortran.


Userguides [all files are *.pdf]
English version 4.7 [here] Supplement 4.9x [here] Neue Deutsche Version des Handbuchs 6.0 von DM3ML[hier]
Manuale Operativo Italiano [qui] Guide de l’utilisateur [ici]
Руководство пользователя WSJT 4.7.0 на русском языке [Скачать] Userguide Japanese [here]
Userguide Polish [here] Userguide Serbian [here]

Please read the JT65 FAQ and install description carefully (known bugs, setup news etc.!).

More on WSJT here - Databases:

HISTORY LIST From Ver. 1.0 to ver. 5.9.2
FSK441 Definition and specification of the FSK441 encoding scheme used in WSJT. 
UPDATES Information on updates for present WSJT users.
MS/WSJT ( < 4.9.0)-DATABASE  CALLSIGN.TXT will be the METEORSCATTER DATABASE for WSJT issued earlier than version 4.9.0.
WSJT CALL3 DATABASE good for ver. 4.9.1 an up, by DL8EBW, new
ver. 2.14, February 11. 2005 [Call3.database!]
METEORSCATTER-DATABASE is the normal known TEXTFILE to find partners and search for some call in ordenary TEXT
structure. This DATABASE also includes MS-Expedition- and /P Calls.
WSJT CALLSIGN REGISTRY compiled AA1YN. This registery is a database register to maintain the callsign.txt data file for WSJT use
Another Callsign Registry compiled by W7GJ, combines data from: AA1YN'S VHF AND UP REGISTRY, DL8EBW'S VHF and MS/WSJT database, DL4EBY'S 432 AND UP EME DIRECTORY, W5LBT'S EME DIRECTORY

Who is Joe Taylor, K1JT?

Joe is 1993 Nobel Laureate in Physics for the discovery of a new type of pulsar, a discovery that has opened up new possibilities for the study of gravitation.

See The Princeton Pulsar Group which is part of the Gravity Group in the
Department of Physics at Princeton University. They are particularly interested in studies of radio pulsars, with active research efforts aimed at high precision timing, studies of the pulsar emission mechanism, and, of course, the continuing search for new pulsars.
See also Autobiography of J. H. Taylor at the Nobel e-Museum.

Installation and post-installation help: If you have problems after following the installation or upgrading instructions, your best sources of help will probably be other users, perhaps via the HSMS, WSVHF, or METEOR-SCATTER reflectors and of course  the WSJT/JT44 Forum and BBS. If you need information about amateur meteor scatter communication in general, the procedures used for schedules and QSOs, etc., meet one of the following sites:

To contact me, send email to

Here is a screen dump of WSJT running at K1JT.

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