Hello Joe,
Here you are, that's nice :-)
Thanks for your work and development and quick updates of JT9 for LF/MF
use! Certainly there will be impressive distances covered in JT9 during
this winter season.
The mapping feature as in WSPR is an important motivation i think, both
for RX and the TX stations!
I will now prepare for a JT9-30 transmission on 137.43 kHz, running this
until tomorrow 6 UTC.
73! Stefan/DK7FC
Am 28.10.2012 14:15, schrieb Joe Taylor:
GM/GA all,
1. Alberto/I2PHD and others have asked whether details of the JT9
protocol are described somewhere. At present the only full description
is the one implicitly contained in the source code, which is openly
available at http://developer.berlios.de/projects/wsjt/ . In due
course I will provide a summary document describing the source
encoding, error-control coding, interleaving and bit-ordering scheme,
and modulation details. (At this point it's possible that a few of
these things could still change, depending on user feedback.)
2. Roger/G3XBM and others asked whether a WSPRnet-like database might
be made available. Yes, this could be useful, and in principle WSPRnet
itself could accept reception reports from WSJT-X. I will give some
thought to adding such a feature, and I'll consider having WSJT-X
support standard WSPR-format messages such as "WA1ABC FN42 37". I
should mention, however, that the principal intent of JT9 and WSJT-X
is to enable 2-way QSOs at MF and LF, with very narrow bandwidths and
very weak signals. In the longer term, I do not wish that our MF/LF
frequencies will be used mostly for beacon-like transmissions.
3. WSJT-X will continue to evolve in coming weeks. The JT9 decoder is
not yet fully optimized, and other enhancements are in the works, as
well. Surely there will be bugs in the early program releases: bug
reports and requests for new features will be most welcome!
-- 73, Joe, K1JT
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