If you decide to participate in the beta testing period, please accept the responsibility of reporting any bugs that you find, as well as telling me of features you would still like to see. Earlier versions of WSJT had a bug that could cause the "Zap" function to notch out a valid sync tone. This change is transparent to the user, and the full benefit of the soft-decision decoder is still available. Keying of the audio tone to produce Morse code has been softened to suppress key clicks. The correct locations of the two peaks are marked by small yellow ticks. The reported values of DT are more accurate, as well. 
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One of the first tasks of the JT65 decoder is to measure the signal level at each of the 64 data-tone frequencies during each of the 63 data intervals in a transmission.
As always, I will be happy to receive your comments on the new release. The occasional error message about "images do not match" has been trapped and should no longer occur. The graphical display of information obtained during JT65 decoding has been enhanced.
You do NOT need 8-channel surround-sound, wavetable synthesis, special effects, etc. Consequently, the "deep search decoder" takes the callsigns listed in the file CALL2. It has been transformed into a multi-layered procedure that takes better advantage of the structured nature of JT65 messages and the substantial computing capability that most WSJT users have in their hamshacks.
The reported values of DT are more accurate, as well. A bug was introduced when implementing the "Aggressive decoding" check box.
Download File List - WSJT - OSDN
The extra bits comprise the powerful forward error correction FEC capability of the JT65 mode, allowing the system to function reliably with signals far below the audible threshold. The standard "CQ" message generated for a callsign having an extra prefix or suffix should not include a grid locator.
I would appreciate hearing about new features that you like, as well. It appears to be a problem peculiar to certain sound cards or Windows configurations. When running at speedsssjt waterfall spectrum may optionally be "flattened" to remove rolloff at edges. This is not yet done in v4.
The "ms" parameter has been removed from the Soundcard status readout at bottom left.
LINUX Mageia 4 and Lubuntu 14 for AR Digital Modes
Check "Sked" to signify that you are trying to work a known station; the deep search decoder will then look only for your own call and the one displayed in the "To Radio" box.
An open source hard-decision decoder is also provided; it's what you get when you select the "Fast" JT65 decoding option. Both automatic decoding and mouse-picked decoding have 9.55 improved.
To start the real-time spectral display, click Monitor. However, it contains many thousands of lines of new code, and most likely that code has some bugs. If you provide information and post questions about WSJT 5. This bug caused a stray "OOO" flag to be sometimes displayed even when no signal was present and synchronization had not been achieved.
The Monitor button is no longer highlighted in green while you are transmitting. However, the user interface and other real-time portions of the program have been entirely re-written, so you may find a few things that look different or work differently than before.
Debian/Ubuntu WSPR in WSJT-X Install instructions
The use of non-threadsafe code for FFTs could cause occasional and unpredictable program crashes. I apologize for the fact that if you have 9.55 edited CALL2.
You should normally expect EME signals to have DT in the range 2 to 3 seconds, but the program will now synchronize properly even if DT is well outside this range.
High-confidence matching of this kind can be accomplished down to about dB on the WSJT scale, in a single transmission, with a very low error rate. However, if a station that is listed in the file CALL2.
The following is a very brief description; more complete technical details will be forthcoming then I find time to write it all down. Please, if you encounter a received wave file that reproducibly cause WSJT to crash, send it to me.
Text windows are now cleared when switching between modes. The box labeled "NB" enables a software noise blanker.
Debian/Ubuntu WSPR in WSJT-X Install instructions | WSPRnet
Otherwise, you will probably want to ignore the supplied file, since you will have made additions to your own copy. Keying of the audio tone to produce Morse code has been softened to suppress key clicks. The best decoder will go as far down into the noise ssjt possible, but it must also know when to give up so that it produces few false decodes.
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