[Fourlanders] Fwd: [NCDXCC] Coming soon: WSJT-X 2.2.0-rc1

Wed May 6 10:27:31 EDT 2020

Didn't know if y'all had seen this.

---------- Forwarded message ---------
From: 'Dave Anderson, K4SV' davek4sv at yahoo.com [NCDXCC] <
NCDXCC at yahoogroups.com>
Date: Wed, May 6, 2020, 9:15 AM
Subject: [NCDXCC] Coming soon: WSJT-X 2.2.0-rc1
To: NCDXCC <ncdxcc at yahoogroups.com>, GreerARC <greerarc at groups.io>, SCDXA <
scdxa at groups.io>, IDXCC <idxcc at yahoogroups.com>

This just in front Lynn W4NL

Big WSJTX improvements in the way, Read below

Thanks
Dave Anderson, K4SV
828-777-5088

*-------- Forwarded Message --------*
Subject: *[WSJTX] Coming soon: WSJT-X 2.2.0-rc1*
Date: *Tue, 5 May 2020 12:50:54 -0400*
From: *Joe mailto:joe at princeton.edu <joe at princeton.edu>*
Reply-To: *WSJTX at groups.io <WSJTX at groups.io>*
To:
* <WSJTX at groups.io>*

*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*

__._,_.___
------------------------------
Posted by: "Dave Anderson, K4SV" <davek4sv at yahoo.com>
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