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Weak Signal Communication Software


WSJT-X and MAP65 are open-source programs designed for weak-signal digital communication by amateur radio.  Normal usage requires a standard SSB transceiver and a personal computer with soundcard, or the equivalent.  SDR-style hardware including the SDR-IQ, Perseus, SoftRock, and FUNcube Dongle is supported by MAP65.  All of the programs are available free of charge, licensed under the GNU General Public License.  Installation packages for WSJT-X are available for Windows, Linux, and OS X, and MAP65 ais Windows only.  For further details about source code and operating systems, see the Program Development page.

WSJT-X ("Weak Signal Communication, by K1JT") offers specific digital protocols optimized for EME (moonbounce), meteor scatter, and ionospheric scatter, at VHF/UHF, as well as for LF, MF, and HF propagation.  The program can decode fraction-of-a-second signals reflected from ionized meteor trails and steady signals more than 10 dB below the audible threshold.  WSJT-X incorporates nearly all popular capabilities of the former programs WSJT and WSPR, while adding comprehensive rig control and many other features.  Check the WSJT-X page and links therein for details about modes FT4, FT8, FST4, FST4S, JT4, JT9, JT65, Q65, MSK144, and WSPR. 

MAP65 implements a wideband receiver for JT65 signals, optimized for EME on the VHF/UHF bands.  It can be used together with Linrad (by SM5BSZ) or with direct input from a soundcard or FUNcube Dongle.  The program decodes all JT65 signals in a passband up to 90 kHz wide, producing a sorted band map of decoded callsigns.  In a dual-polarization system, MAP65 optimally matches the linear polarization angle of each signal, thereby eliminating problems with Faraday rotation and spatial polarization offsets. 

©2001-2023  by Joe Taylor, K1JT