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Prep for v2.2.0
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Bill Somerville
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92
NEWS
92
NEWS
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Copyright 2001 - 2019 by Joe Taylor, K1JT.
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Release: WSJT-X 2.2.0-rc1
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May 10, 2020
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-------------------------
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WSJT-X 2.2.0-rc1 is a beta-quality release candidate for a program
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upgrade that provides a number of new features and capabilities. These
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include:
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- Improvements to the decoders for five modes:
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FT4: Corrected bugs that prevented AP decoding and/or multi-pass
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decoding in some circumstances. The algorithm for AP
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decoding has been improved and extended.
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FT8: Decoding is now spread over three intervals. The first
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starts at t = 11.8 s into an Rx sequence and typically yields
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around 85% of the possible decodes for the sequence. You
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therefore see most decodes much earlier than before. A second
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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
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more. (Systems with receive latency greater than 0.2 s will see
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smaller improvements, but will still see many decodes earlier
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than before.)
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JT4: Formatting and display of Averaged and Deep Search decodes
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has been cleaned up and made consistent with other modes.
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Together with JT65 and QRA64, JT4 remains one of the digital
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modes widely for EME and other extreme weak-signal work on
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microwave bands.
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JT65: Many improvements for Averaged and Deep Search decodes and
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their display to the user. These improvements are particularly
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important for EME on VHF and UHF bands.
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WSPR: Significant improvements have been made to the WSPR
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decoder's sensitivity, its ability to cope with many signals in
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a crowded sub-band, and its rate of undetected false decodes.
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We now use up to three decoding passes. Passes 1 and 2 use
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noncoherent demodulation of single symbols and allow for
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frequency drifts up to ±4 Hz in a transmission. Pass 3 assumes
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no drift and does coherent block detection of up to three
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symbols. It also applies bit-by-bit normalization of the
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single-symbol bit metrics, a technique that has proven helpful
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for signals corrupted by artifacts of the subtraction of
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stronger signals and also for LF/MF signals heavily contaminated
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by lightning transients. With these improvements the number of
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decodes in a crowded WSPR sub-band typically increases by 10 to
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15%.
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- New format for "EU VHF Contest" Tx2 and Tx3 messages
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When "EU VHF Contest" is selected, the Tx2 and Tx3 messages
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(those conveying signal report, serial number, and 6-character
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locator) now use hashcodes for both callsigns. This change is
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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
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to versiion 2.2.0.
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- Accessibility
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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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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
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rendered in a darker shade of green.
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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
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"Special operating activities" on the "Settings | Advanced" tab.
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Contest mode FT4 now always uses RR73 for the Tx4 message.
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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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Release candidate WSJT-X 2.2.0-rc1 will be available for beta-testing
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for one month starting on May 10, 2020. We currently plan a General
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Availability (GA) release of WSJT-X 2.2.0 on June 1, 2020.
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For those looking even farther ahead: We are well along in the
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development of two new modes designed for the LF and MF bands. One
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mode is for WSPR-like activity and one for making 2-way QSOs. Both
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use Low-density Parity Check (LDPC) codes, 4-GFSK modulation, and
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two-minute T/R sequences. The QSO mode reaches threshold SNR
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sensitivity around -31 dB on the AWGN channel, and the WSPR-like mode
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better than -32 dB.
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Release: WSJT-X 2.1.1
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November 25, 2019
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---------------------
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@ -12,8 +12,9 @@
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Copyright 2001 - 2020 by Joe Taylor, K1JT.
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Release: WSJT-X 2.2.0-rc1
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May 10, 2019
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May 10, 2020
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-------------------------
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WSJT-X 2.2.0-rc1 is a beta-quality release candidate for a program
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@ -2,5 +2,5 @@
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set (WSJTX_VERSION_MAJOR 2)
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set (WSJTX_VERSION_MINOR 2)
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set (WSJTX_VERSION_PATCH 0)
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set (WSJTX_RC 0) # release candidate number, comment out or zero for development versions
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set (WSJTX_RC 1) # release candidate number, comment out or zero for development versions
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set (WSJTX_VERSION_IS_RELEASE 0) # set to 1 for final release build
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