81 lines
4.1 KiB
Plaintext
81 lines
4.1 KiB
Plaintext
|
||
__ __ ______ _____ ________ __ __
|
||
| \ _ | \ / \ | \| \ | \ | \
|
||
| $$ / \ | $$| $$$$$$\ \$$$$$ \$$$$$$$$ | $$ | $$
|
||
| $$/ $\| $$| $$___\$$ | $$ | $$ ______ \$$\/ $$
|
||
| $$ $$$\ $$ \$$ \ __ | $$ | $$| \ >$$ $$
|
||
| $$ $$\$$\$$ _\$$$$$$\| \ | $$ | $$ \$$$$$$/ $$$$\
|
||
| $$$$ \$$$$| \__| $$| $$__| $$ | $$ | $$ \$$\
|
||
| $$$ \$$$ \$$ $$ \$$ $$ | $$ | $$ | $$
|
||
\$$ \$$ \$$$$$$ \$$$$$$ \$$ \$$ \$$
|
||
|
||
|
||
|
||
Copyright (C) 2001 - 2017 by Joe Taylor, K1JT.
|
||
|
||
WSJT-X is a computer program designed to facilitate basic amateur
|
||
radio communication using very weak signals. The first four letters in
|
||
the program name stand for “Weak Signal communication by K1JT,” while
|
||
the suffix “-X” indicates that WSJT-X started as an extended (and
|
||
experimental) branch of the program WSJT.
|
||
|
||
WSJT-X Version 1.6 offers five protocols or “modes”: JT4, JT9, JT65
|
||
WSPR, and Echo. The first three are designed for making reliable QSOs
|
||
under extreme weak-signal conditions. They use nearly identical
|
||
message structure and source encoding. JT65 was designed for EME
|
||
(“moonbounce”) on the VHF/UHF bands and has also proven very effective
|
||
for worldwide QRP communication on the HF bands. JT9 is optimized for
|
||
the LF, MF, and lower HF bands. It is 2 dB more sensitive than JT65
|
||
while using less than 10% of the bandwidth. JT4 offers a wide variety
|
||
of tone spacings and has proved very effective for EME on microwave
|
||
bands up to 24 GHz. All three of these modes use one-minute timed
|
||
sequences of alternating transmission and reception, so a minimal QSO
|
||
takes four to six minutes — two or three transmissions by each
|
||
station, one sending in odd UTC minutes and the other even. On the HF
|
||
bands, world-wide QSOs are possible using power levels of a few watts
|
||
and compromise antennas. On VHF bands and higher, QSOs are possible
|
||
(by EME and other propagation types) at signal levels 10 to 15 dB
|
||
below those required for CW.
|
||
|
||
WSPR (pronounced “whisper”) stands for Weak Signal Propagation
|
||
Reporter. The WSPR protocol was designed for probing potential
|
||
propagation paths using low-power transmissions. WSPR messages
|
||
normally carry the transmitting station’s callsign, grid locator, and
|
||
transmitter power in dBm, and they can be decoded at signal-to-noise
|
||
ratios as low as -28 dB in a 2500 Hz bandwidth. WSPR users with
|
||
internet access can automatically upload their reception reports to a
|
||
central database called {wsprnet} that provides a mapping facility,
|
||
archival storage, and many other features.
|
||
|
||
Echo mode allows you to detect and measure your own lunar echoes, even
|
||
if they are far below the audible threshold.
|
||
|
||
WSJT-X provides spectral displays for passbands up to 5 kHz, flexible
|
||
rig control for nearly all modern radios used by amateurs, and a wide
|
||
variety of special aids such as automatic Doppler tracking for EME
|
||
QSOs and Echo testing. The program runs equally well on Windows,
|
||
Macintosh, and Linux systems, and installation packages are available
|
||
for all three platforms.
|
||
|
||
WSJT-X is an open-source project released under the GPL license (See
|
||
COPYING). If you have programming or documentation skills or would
|
||
like to contribute to the project in other ways, please make your
|
||
interests known to the development team. The project’s source-code
|
||
repository can be found at https://sourceforge.net/projects/wsjt, and
|
||
most communication among the developers takes place on the email
|
||
reflector https://sourceforge.net/p/wsjt/mailman. User-level
|
||
questions and answers, and general communication among users is found
|
||
on the https://groups.yahoo.com/neo/groups/wsjtgroup/info email
|
||
reflector.
|
||
|
||
|
||
Project web site:
|
||
|
||
http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html
|
||
|
||
Project mailing list (shared with other applications from the same
|
||
team):
|
||
|
||
https://groups.yahoo.com/neo/groups/wsjtgroup
|
||
|