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