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39 lines
2.2 KiB
Plaintext
39 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”, and
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the “-X” suffix indicates that _WSJT-X_ started as an extended (and
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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 also proved very effective for worldwide QRP
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communication at HF. 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. World-wide QSOs are possible
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with power levels of a few watts and compromise 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. If you have
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programming or documentation skills or would like to contribute to the
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project in other ways, please make your interests known to the
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development team. The project’s source-code repository can be found
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at {devsvn}, and communication among the developers takes place on the
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email reflector {devmail}.
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