2014-11-28 18:34:23 -05:00
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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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2015-11-13 08:23:30 -05:00
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Copyright (C) 2001 - 2015 by Joe Taylor, K1JT.
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2014-11-28 18:34:23 -05:00
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WSJT-X implements JT9, a new mode designed especially for the LF, MF,
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and HF bands, as well as the popular mode JT65. Both modes were
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designed for making reliable, confirmed QSOs under extreme weak-signal
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conditions. They use nearly identical message structure and source
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encoding. JT65 was designed for EME (“moonbounce”) on the VHF/UHF
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bands and has also proved very effective for worldwide QRP
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communication at HF; in contrast, JT9 is optimized for HF and lower
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frequencies. JT9 is about 2 dB more sensitive than JT65A while using
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less than 10% of the bandwidth. World-wide QSOs are possible with
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power levels of a few watts and compromise antennas. A 2 kHz slice of
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spectrum is essentially full when occupied by ten JT65 signals. As
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many as 100 JT9 signals can fit into the same space, without overlap.
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WSJT-X offers a “bi-lingual” operating mode in which you can transmit
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and receive JT65 and JT9 signals, switching between modes
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automatically as needed. Displayed bandwidth can be as large as 5
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kHz. If your receiver has as upper-sideband filter at least 4 kHz
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wide, you can have all the typical JT65 and JT9 activity on screen at
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once, available for making QSOs with a click of the mouse. Even with
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standard SSB-width IF filters, switching between JT65 and JT9 modes is
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quick and convenient. Be sure to read the online WSJT-X User's Guide.
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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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