Hi all,
I have found and corrected a problem that several have noticed in the
ISCAT decoder in WSJT. The bug was especially troublesome in messages
containing a single repeated character, such as the message "RRR".
The problem is fixed in the WSJT code repository as of revision 5634.
Bill (ND0B) should update his code branch accordingly, so that the
"ISCAT_SS" test version of WSJT will use the improved decoder.
Note: Up to now the ISCAT decoder has made its own decision about the
most reliable decoded message and displayed only that one. For testing,
at least, I have changed the logic so that if the "Sync" limit is set to
0, many decodes (based on different parts of the received signal) can be
displayed. With higher Sync settings only the best will be displayed,
as before.
This is a good time also for me to make a special request of all those
using ISCAT with Bill's recent program improvements. Further
improvements to the ISCAT decoder are possible. The necessary work will
be easier and the results more reliable if I have a good collection of
*.wav files containing real over-the-air ISCAT signals. The most useful
files will be ones where the signal is weak and barely decodable or "not
quite decodable".
If you are testing ISCAT and this is easy for you to do, please zip up a
collection of several such files and send them to me. Many thanks!
-- 73, Joe, K1JT
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