Hi all,
This message is especially for Bill/ND0B, because he designed the
auto-sequencing option in WSJT10. But it's also for anyone who has been
exercising the fast JT9 modes.
Are you happy with the way the current auto-sequencer takes one through
a QSO? Any suggestions for making it better?
The fast JT9 modes are designed for meteor and ionospheric scatter on 6
meters. They also work well on 10 m, and perhaps on 4 m. But they're
not very useful at 144 MHz and above, because they require minimum ping
durations around 400 ms.
in the last ten days I've been working on a new mode tentatively called
JTMSK. It uses 2-tone "minimum shift keying" (MSK) at 2000 baud, and
it's aimed at situations where signal enhancements (e.g., from weak,
underdense meteor pings) are too short to be decodable in JT9H. There's
no JTMSK decoder in WSJT-X, as yet, but a stand-alone command-line
decoder is now working well on recorded pings copied over the air.
Sensitivity is about the same as FSK441, and pings can be as short as
100 ms. JTMSK has strong forward error correction, so you get perfect
decodes with no on-screen garbage.
I'm busy now with some necessary optimizations of the decoder. If all
goes well with that effort, JTMSK might be available for testing by
others in a week or so.
-- 73, Joe, K1JT
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