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WSJT Home Page by K1JT
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| Home WSJT MAP65 WSPR SimJT Program Development References |
Weak Signal Communication SoftwareWSJT, 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. SimJT is a utility that generates simulated signals for testing purposes. Ready-to-run Windows versions of all four programs are available for free download. For other operating systems, see the Program Development page.WSJT ("Weak Signal
Communication, by K1JT") offers specific digital protocols optimized
for
meteor scatter,
ionospheric
scatter, and EME (moonbounce) at VHF/UHF, as well as HF skywave
propagation. The program can decode
fraction-of-a-second signals reflected from
ionized meteor trails and steady signals 10 dB below the
audible threshold. MAP65 implements
a wideband,
polarization-matching receiver for JT65
signals. It works together with Linrad (by
SM5BSZ) and dual-polarization RF hardware to receive and decode all
detectable JT65 signals in a 90
kHz passband, matching the linear polarization angle of each
one and producing a band map of decoded callsigns sorted by
frequency. Its
principal application is EME on the VHF and UHF
bands. MAP65-IQ
is a single-polarization version designed to work with the
SDR-14, SDR-IQ, and Perseus receivers. It has all
features of MAP65 except the polarization matching capability,
and it supports the JT65A, B, and C submodes. WSPR (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.
WSPR 2.0 was introduced on
November 19, 2009. SimJT generates
JT65 and CW test
signals with a user-specified signal-to-noise ratio. It is useful
for
testing the JT65 decoder and the relative capabilities of these
two modes.
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