WSJT is an amateur radio software for Windows, it is a modified version of WSJT-X. In order to use it, you need to have a radio that either can be connected to the soundcard on your PC or has a built-in soundcard allowing direct input from the computer.

Radio communication

This open-source utility is designed for weak-signal communication between amateur radio operators. It uses various digital signal processing (DSP) techniques. There are several communication modes that can be divided into two major groups, namely, fast and slow modes.

Fast modes operate without error correction. They include JTMS, FSK441, ISCAT, and JT6M. Slow modes, on the other hand, are optimized for minimal QRP usage. WSJT supports JT65, JT4, JT9, FT8, and QRA64.

Files and settings

To store configuration settings, the utility uses the JTDX.INI file. To find it, select File – Open log directory in the drop-down menu. It is recommended to back it up regularly, especially before updating the software.

Another file CALL3.TXT contains callsign and grid data. It is used for hinted decoders and the detection of false decodes. The WSJTX_LOG.ADI file is used for QSO logging. Both these files should be copied manually if you upgrade from an older version of the utility.

JTDX software works with a 48 kHz sampling rate and 16-bit depth audio stream. To avoid resampling and decoding performance degradation, it is recommended to configure the input and output of the audio device in the operating system.

Features

the utility is free to download and use;
supports several fast and slow modes;
may be used on many different bands;
facilitates the use of radio propagation modes like high-speed meteor scatter and moonbounce;
open-source software compatible with all modern versions of Windows.