WSJT-X/doc/user_guide/en/new_features.adoc

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=== New in Version {VERSION}
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*Improvements to decoders*
*FT4:* Corrected bugs that prevented AP (_a priori_) decoding and/or
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multi-pass decoding in some circumstances. Improved and extended the
algorithm for AP decoding.
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*FT8:* Decoding is now spread over three intervals. The first starts
11.8 s into an Rx sequence and typically yields around 85% of the
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possible decodes, so you see most decodes much earlier than before. A
second processing step starts at 13.5 s, and the final one at 14.7 s.
Overall decoding yield on crowded bands is improved by 10% or more.
Systems with receive latency greater than 0.2 s will see smaller
improvements, but will still see many decodes earlier than before.
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SNR estimates no longer saturate at +20 dB, and large signals in the
passband no longer cause the SNR of weaker signals to be biased low.
Times written to cumulative journal file ALL.TXT are now correct even
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when the decode occurs after the T/R sequence boundary. In FT8
DXpedition Mode, AP decoding is now implemented for Hounds when the
Fox has a compound callsign.
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*JT4:* Formatting and display of averaged and Deep Search decodes has
been cleaned up and made consistent with other modes used for EME and
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extreme weak-signal work on microwave bands.
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*JT65:* Many improvements have been made for averaged and Deep Search
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decodes, and their display to the user. For details see <<VHF_JT65,JT65>>
in the <<VHF_AND_UP,VHF+ Features>> section of this guide.
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*WSPR:* Significant improvements have been made to the WSPR decoder's
sensitivity, its ability to cope with many signals in a crowded
sub-band, and its rate of undetected false decodes. We now use up to
three decoding passes. Passes 1 and 2 use noncoherent demodulation of
single symbols and allow for frequency drifts up to ±4 Hz in a
transmission. Pass 3 assumes no drift and does coherent block
detection of up to three symbols. It also applies bit-by-bit
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normalization of the single-symbol bit metrics, a technique that has
proven helpful for signals corrupted by artifacts of the subtraction
of stronger signals and also for LF/MF signals heavily contaminated by
lightning transients. With these improvements the number of decodes
in a crowded WSPR sub-band typically increases by 10 to 15%.
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*New message format:* When *EU VHF Contest* is selected, the Tx2 and
Tx3 messages -- those conveying signal report, serial number, and
6-character locator -- now use hashcodes for both callsigns. This
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change is *not* backward compatible with earlier versions of _WSJT-X_, so
all users of *EU VHF Contest* messages should be sure to upgrade to
versiion 2.2.0. See <<CONTEST_MSGS,Contest Messages>> for details.
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*Minor enhancements and bug fixes*
- *Save None* now writes no .wav files to disk, even temporarily.
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- An explicit entry for *WW Digi Contest* has been added to *Special
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operating activities* on the *Settings | Advanced* tab.
- The contest mode FT4 now always uses RR73 for the Tx4 message.
- *Keyboard shortcuts* have been added as an aid to accessibility:
*Alt+R* sets Tx4 message to RR73, *Ctrl+R* sets it to RRR.
- The *Status bar* now displays the number of decodes found in the
most recent Rx sequence.
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- As an aid for partial color-blindness, the "`inverted goal posts`"
marking Rx frequency on the Wide Graph's frequency scale are now in a
darker shade of green.
=== Documentation Conventions
In this manual the following icons call attention to particular types
of information:
NOTE: *Notes* containing information that may be of interest to
particular classes of users.
TIP: *Tips* on program features or capabilities that might otherwise be
overlooked.
IMPORTANT: *Warnings* about usage that could lead to undesired
consequences.
=== How You Can Contribute
_WSJT-X_ is part of an open-source project released under the
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{gnu_gpl} (GPLv3). If you have programming or documentation skills or
would like to contribute to the project in other ways, please make
your interests known to the development team. The project's
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source-code repository can be found at {devrepo}, and communication
among the developers takes place on the email reflector {devmail}.
Bug reports and suggestions for new features, improvements to the
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_WSJT-X_ User Guide, etc., may be sent there as well. You must join
the group before posting to the email list.