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97 lines
4.2 KiB
Plaintext
97 lines
4.2 KiB
Plaintext
=== New in Version {VERSION}
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*Improvements to decoders*
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*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
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algorithm for AP decoding.
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*FT8:* Decoding is now spread over three intervals. The first starts
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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
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second processing step starts at 13.5 s, and the final one at 14.7 s.
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Overall decoding yield on crowded bands is improved by 10% or more.
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Systems with receive latency greater than 0.2 s will see smaller
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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
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passband no longer cause the SNR of weaker signals to be biased low.
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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
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DXpedition Mode, AP decoding is now implemented for Hounds when the
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Fox has a compound callsign.
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*JT4:* Formatting and display of averaged and Deep Search decodes has
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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>>
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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
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sensitivity, its ability to cope with many signals in a crowded
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sub-band, and its rate of undetected false decodes. We now use up to
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three decoding passes. Passes 1 and 2 use noncoherent demodulation of
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single symbols and allow for frequency drifts up to ±4 Hz in a
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transmission. Pass 3 assumes no drift and does coherent block
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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
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proven helpful for signals corrupted by artifacts of the subtraction
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of stronger signals and also for LF/MF signals heavily contaminated by
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lightning transients. With these improvements the number of decodes
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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
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Tx3 messages -- those conveying signal report, serial number, and
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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
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all users of *EU VHF Contest* messages should be sure to upgrade to
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versiion 2.2.0. See <<CONTEST_MSGS,Contest Messages>> for details.
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*Minor enhancements and bug fixes*
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- *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.
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- The contest mode FT4 now always uses RR73 for the Tx4 message.
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- *Keyboard shortcuts* have been added as an aid to accessibility:
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*Alt+R* sets Tx4 message to RR73, *Ctrl+R* sets it to RRR.
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- The *Status bar* now displays the number of decodes found in the
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most recent Rx sequence.
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- As an aid for partial color-blindness, the "`inverted goal posts`"
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marking Rx frequency on the Wide Graph's frequency scale are now in a
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darker shade of green.
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=== Documentation Conventions
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In this manual the following icons call attention to particular types
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of information:
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NOTE: *Notes* containing information that may be of interest to
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particular classes of users.
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TIP: *Tips* on program features or capabilities that might otherwise be
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overlooked.
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IMPORTANT: *Warnings* about usage that could lead to undesired
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consequences.
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=== How You Can Contribute
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_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
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would like to contribute to the project in other ways, please make
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your interests known to the development team. The project's
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source-code repository can be found at {devrepo}, and communication
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among the developers takes place on the email reflector {devmail}.
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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
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the group before posting to the email list.
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