On Tue, May 5, 2020 at 10:24 AM Joe Taylor <j...@princeton.edu> wrote:
> Hi all, > > This message is to let you know of some important WSJT-X development > plans. We plan to make a first candidate release of WSJT-X 2.2.0 next > Monday, May 10. > > WSJT-X 2.2.0-rc1 will be a beta-quality release candidate providing a > number of new features and capabilities. These include: > > - Improvements to the decoders for five modes: > > FT4: Corrected bugs that prevented AP decoding and/or multi-pass > decoding in some circumstances. The algorithm for AP > decoding has been improved and extended. > > FT8: Decoding is now spread over three intervals. The first > starts at t = 11.8 s into an Rx sequence and typically yields > around 85% of the possible decodes for the sequence. You > therefore 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.) > > JT4: Formatting and display of Averaged and Deep Search decodes > has been cleaned up and made consistent with other modes. JT4 > remains the digital mode of choice for EME and other extreme > weak-signal work on microwave bands. > > JT65: Many improvements for Averaged and Deep Search decodes and > their display to the user. These improvements are particularly > important for EME on VHF and UHF bands. > > 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 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%. > > - New format for "EU VHF Contest" Tx2 and Tx3 messages > > 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 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. > > - Accessibility > > Keyboard shortcuts have been added as an aid to accessibility: > Alt+R sets Tx4 message to RR73, Ctrl+R sets it to RRR. > > As an aid for partial color-blindness, the "inverted goal posts" > marking Rx frequency on the Wide Graph's frequency scale are now > rendered in a darker shade of green. > > - Minor enhancements and bug fixes > > "Save None" now writes no .wav files to disk, even temporarily. > > An explicit entry for "WW Digi Contest" has been added to > "Special operating activities" on the "Settings | Advanced" tab. > > Contest mode FT4 now always uses RR73 for the Tx4 message. > > The Status bar now displays the number of decodes found in the > most recent Rx sequence. > > Release candidate WSJT-X 2.2.0-rc1 will be available for beta-testing > for one month starting on May 10, 2020. We currently plan a General > Availability (GA) release of WSJT-X 2.2.0 on June 1, 2020. > > For those looking even farther ahead: We are well along in the > development of two new modes designed for the LF and MF bands. One > mode is for WSPR-like activity and one for making 2-way QSOs. Both > use Low-density Parity Check (LDPC) codes, 4-GFSK modulation, and > two-minute T/R sequences. The QSO mode reaches threshold SNR > sensitivity around -31 dB on the AWGN channel, and the WSPR-like mode > better than -32 dB. > > With best wishes, > > -- Joe, K1JT, Steve, K9AN, and Bill, G4WJS > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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