Thanks Joe for fabulous software.
In WSJT, in wsjt.py, can you define idWarn=-1 to stop the error message?
In WsjtMod/options.py can we default, that the sending callsign be always sent?
And, Downunder here, we use / to attach the report to the callsign as in:
VK7XX/26 VK2ZIW 26
VK7XX/R26 VK2ZIW
VK7XX/RRR VK2ZIW
VK7XX/73 VK2ZIW
Such that when a garbled message via MS is received, we can sort it out.
Lots - a - fun, on 6m, 0700 to 0800 local.
80(more anodes than a 73)
Alan VK2ZIW
On Fri, 07 Aug 2015 16:28:19 -0400, Joe Taylor wrote
Several people have asked for an update on development of the Fast
modes in WSJT and WSJT-X. So here's a brief summary.
First, a review of some relevant terms and motivations. It's
convenient to think of the various WSJT protocols (modes) in two groups:
*Slow modes* -- JT4, JT9, JT65, and WSPR. These modes are designed
for communication with extremely weak signals -- often too weak to
be heard. Target propagation modes include EME and long-distance
troposcatter on VHF-and-up bands, and QRP Dxing on the LF, MF, and
HF bands. Relevant signal amplitudes are approximately constant
over a minute and more, aside from so-called libration fading for
EME. Transmit/receive sequences are 1 minute for JT4, JT9, and JT65,
and 2 minutes for WSPR.
*Fast modes* -- JTMS, FSK441, ISCAT, and JT6M -- and now also
*FSK315*
(implemented in WSJT) and *JT9E* through *JT9H* (implemented in WSJT-
X). These modes are made for communication with rapidly varying
signals: for example, meteor scatter, ionospheric scatter, airplane
scatter, and scatter off the International Space Station. The
decoders are designed take advantage of short enhancements of signal
strength. T/R sequences are 30 seconds (or sometimes even shorter).
Bill, ND0B, has implemented a trial version of FSK315 in WSJT.
Think of this mode as FSK441 slowed down to 315 baud; the bandwidth
is therefore narrow enough to make the mode legal in the CW and
data portion of the 10 meter band. Bill and a few others have been
experimenting with FSK315 and also ISCAT-A on 10 meters, under dead-
band conditions, using meteors and ionospheric scatter propagation.
I have implemented experimental submodes of the JT9 protocol in the
program branch WSJT-X v1.6.1. As with JT4 and JT65, letters
following the JT9 designator indicate increased spacings between
the FSK tones. Traditional JT9 (now also called JT9A) has tone
spacing 1.736 Hz, so the signals used at HF and below have total
bandwidth 9*1.736 = 15.6 Hz. The widest of the new submodes, JT9H,
has tone spacing 200 Hz and therefore bandwidth 9*200 = 1800 Hz.
When used with the standard 1-minute periods, the wide JT9 submodes
should be useful for the same purposes as the wide JT4 submodes:
microwave EME, for example, where libration fading can cause Doppler
spreading of 100 Hz or more. Used in this way, all JT9 submodes are
slow modes; they use 1-minute T/R periods and keying rate 1.736
baud, and they send the full 85-symbol message protocol in 85/1.736
= 48.96 s.
Optionally, the wide JT9 submodes can now also use fast keying
rates equal to their tone spacing. Fast JT9H, for example, uses
keying rate 200 baud, so the full message protocol is transmitted in
85/200 = 0.425
s. The message is sent repeatedly for the full Tx period, in the
same way as done for the other fast modes.
The fast JT9 submodes should be very effective for meteors and
ionoscatter propagation, especially on the 6 meter band.
Sensitivity should be similar to ISCAT, or perhaps slightly better.
Because JT9 includes strong forward error correction, decoding
results are like those for all the slow modes: you should see
messages exactly as they were transmitted, or nothing at all.
Tests of the fast JT9 submodes are currently under way, with
excellent results.
-- 73, Joe, K1JT
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Alan
Man's greatest waste of time: Worshipping the wrong God.
Consider Jesus.
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