To: Users of WSJT-X and the JT9 modes
From: Joe Taylor, K1JT
Version 0.2 of WSJT-X, built from revision #2702 in the SVN directory,
has been posted on the WSJT web site. The direct link for download is
http://www.physics.princeton.edu/pulsar/K1JT/WSJTX_02r2702.exe
Changes since version 0.1, r2696 include the following:
1. Sample rate for audio output has been changed from 12000 to 48000 Hz.
Tx audio may now be generated at any frequency from 500 to 20000 Hz.
2. The Decoder now tries to decode all synchronizable signals in the
"green zone", that is, within "Tol" Hz of the selected QSO frequency.
(Before, by default it decoded only the signal producing the highest
"sync" value. Other signals could be decoded by manually setting the
QSO frequency and reducing Tol as needed.)
3. The user's selected QSO Frequency is now saved and restored on
program restart.
4. The problem with re-initialization after changing sub-modes has been
fixed.
5. The problem (for some users) of not releasing PTT after end of a
transmission has been fixed.
6. The program now writes a log of all decodes to a file wsjtx_rx.log in
the wsjtx directory.
A few additional comments about the first few days of JT9 usage:
Last evening I called CQ with JT9-1 on 160 meters and made three quick
QSOs. Only one of the QSOs was pre-arranged, so the word is getting
around. Best DX was DN07dg, some 2271 km from FN20qi. We were all
using low power. So I can say that JT9-1 works well on 160m, providing
about the same sensitivity as JT65A in about 1/10 the bandwidth. On
160m JT65A may have an advantage in conditions with deep fades, since
its FEC has significantly higher redundancy.
WE2XGR, WE3XGR, WG2XJM, and possibly others in NA have been making QSOs
and other tests on 500 kHz.
You may continue to expect further improvements and new WSJT-X program
releases in coming days and weeks. Please keep the bug reports and
requests for new features coming! They are much appreciated.
-- 73, Joe, K1JT
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