WSJT Home Page
Weak Signal Communication SoftwareWSJT-X, WSJT, MAP65, and WSPR 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 and WSPR. SimJT is a utility program that generates simulated signals for test purposes. 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; WSJT and WSPR have Windows and Linux packages, and MAP65 and SimJT are Windows only. For further details about source code and operating systems, see the Program Development page.
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 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 JT4,
JT9, JT65, QRA64, ISCAT, MSK144, and WSPR.
WSJT is the original program, started in 2001. Version 10 implements modes JTMS, FSK441, FSK315, ISCAT, JT6M, JT65, and JT4.
a wideband receiver for JT65 signals, optimized for
EME on the VHF/UHF bands. It can be used together
(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
optimally matches the linear polarization angle of each
signal, thereby eliminating problems with Faraday rotation
and spatial polarization offsets.
(pronounced "whisper") stands for "Weak Signal Propagation
Reporter." This program is designed for sending and
receiving low-power transmissions to test propagation
paths on the MF and HF bands. Users with internet
access can watch results in real time at WSPRnet. Version 2.11 of WSPR includes FMT, a
package of command-line utilities that can help you make
highly accurate frequency measurements without expensive
laboratory equipment. Experimental version WSPR-X is also
available, offering an optional mode WSPR-15 with
15-minute transmissions and better sensitivity by about 9
SimJT generates JT65 and
CW test signals with user-specified signal-to-noise
ratio. It is useful for testing the JT65 decoder and
the relative capabilities of these two modes.
©2001-2016 by Joe Taylor, K1JT