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461afef30f
* mainwindow.cpp - bumped ver# * Added updates from Chase, KE4QDL git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3670 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
42 lines
2.2 KiB
Plaintext
42 lines
2.2 KiB
Plaintext
// Status=review
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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
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in the program name stand for ``Weak Signal communication by K1JT'',
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and the “-X” suffix indicates that _WSJT-X_ started as an extended
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(and experimental) branch of program _WSJT_.
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_WSJT-X_ currently offers two protocols or “modes,” JT65 and JT9.
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Both are designed for making reliable, confirmed QSOs under extreme
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weak-signal conditions. They use nearly identical message structure
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and source encoding. JT65 was designed for EME (“moon-bounce”) on the
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VHF/UHF bands and has proved very effective for worldwide QRP
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communication on the HF bands, too. JT9 is optimized for the LF, MF, and HF bands.
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It is about 2 dB more sensitive than JT65 while using less than 10% of
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the bandwidth. Both modes use one-minute timed sequences of
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alternating transmission and reception, so a minimal QSO takes four to
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six minutes — two or three transmissions by each station, one sending
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in odd UTC minutes and the other even. On the HF bands, world-wide
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QSOs are possible with power levels of a few watts and compromise
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antennas.
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_WSJT-X_ can display a bandpass as large as 5 kHz and transparently
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provides dual-mode reception of both JT65 and JT9 signals. If your
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receiver can be configured with at least 4 kHz bandwidth in USB mode,
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you can set the dial frequency to one of the standard JT65 frequencies
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— for example, 14.076 MHz for the 20-meter band — and display the full
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JT65 and JT9 sub-bands simultaneously on the waterfall. You can then
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make QSOs in both modes using nothing more than mouse clicks.
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Plans for future program development call for _WSJT-X_ and _WSJT_ to
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merge together. _WSJT-X_ will gradually acquire the additional modes
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JT4, FSK441, and ISCAT that are now supported in _WSJT_. The entire
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WSJT-related effort is an open-source project, released under the GNU
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General Public License (GPL). If you have programming or
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documentation skills or would like to contribute to the project in
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other ways, please make your interests known to the development team.
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The project’s source-code repository can be found at {devsvn}, and
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most communication among the developers takes place on the email
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reflector {devmail}.
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