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44 lines
2.3 KiB
Plaintext
44 lines
2.3 KiB
Plaintext
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// 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 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_ 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 (“moonbounce”) on the
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VHF/UHF bands and has also proven very effective for worldwide QRP
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communication on the HF bands. JT9 is optimized for the LF, MF, and
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lower HF bands. It is about 2 dB more sensitive than JT65
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while using less than 10% of the bandwidth. Both modes use one-minute
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timed sequences of alternating transmission and reception, so a
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minimal QSO takes four to six minutes — two or three transmissions by
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each station, one sending in odd UTC minutes and the other even. On
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the HF bands, world-wide QSOs are possible with power levels of a few
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watts and compromise antennas.
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_WSJT-X_ can display a passband as large as 5 kHz and provides
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dual-mode reception of both JT65 and JT9 signals. If your receiver can
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be configured with at least 4 kHz bandwidth in USB mode, you can set
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the dial frequency to one of the standard JT65 frequencies — for
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example, 14.076 MHz for the 20-meter band — and display the full JT65
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and JT9 sub-bands simultaneously on the waterfall. You can then make
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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 additional modes
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such as JT4 that are now supported in _WSJT_. The entire
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WSJT-related effort is an open-source project, released under the
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{gnu_gpl} (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}. User-level questions and answers, and general
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communication among users is found on the {wsjt_yahoo_group} email
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reflector.
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