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__ __ ______ _____ ________ __ __ | \ _ | \ / \ | \| \ | \ | \ | $$ / \ | $$| $$$$$$\ \$$$$$ \$$$$$$$$ | $$ | $$ | $$/ $\| $$| $$___\$$ | $$ | $$ ______ \$$\/ $$ | $$ $$$\ $$ \$$ \ __ | $$ | $$| \ >$$ $$ | $$ $$\$$\$$ _\$$$$$$\| \ | $$ | $$ \$$$$$$/ $$$$\ | $$$$ \$$$$| \__| $$| $$__| $$ | $$ | $$ \$$\ | $$$ \$$$ \$$ $$ \$$ $$ | $$ | $$ | $$ \$$ \$$ \$$$$$$ \$$$$$$ \$$ \$$ \$$ Copyright (C) 2001 - 2015 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
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