<div dir="ltr"><br clear="all"><div><div class="gmail_signature" dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><span lang="PT" style="color:rgb(31,73,125);font-size:11pt"><p>FYI<br><br>73, Miguel</p><p>CT1BYM</p></span><p><br></p></div></div></div></div></div></div></div></div></div></div></div></div></div><br><br><div class="gmail_quote"><div class="gmail_attr" dir="ltr">---------- Forwarded message ---------<br>De: <strong class="gmail_sendername" dir="auto">Joe Taylor via Moon-net</strong> <span dir="auto"><<a href="mailto:moon-net@mailman.pe1itr.com">moon-net@mailman.pe1itr.com</a>></span><br>Date: terça, 5/05/2020 à(s) 17:21<br>Subject: [Moon-Net] Coming soon: WSJT-X 2.2.0-rc1<br>To: <<a href="mailto:moon-net@mailman.pe1itr.com">moon-net@mailman.pe1itr.com</a>><br></div><br><br>Hi all,<br>
<br>
This message is to let you know of some important WSJT-X development <br>
plans. We plan to make a first candidate release of WSJT-X 2.2.0 next <br>
Monday, May 10.<br>
<br>
WSJT-X 2.2.0-rc1 will be a beta-quality release candidate providing a <br>
number of new features and capabilities. These include:<br>
<br>
- Improvements to the decoders for five modes:<br>
<br>
FT4: Corrected bugs that prevented AP decoding and/or multi-pass<br>
decoding in some circumstances. The algorithm for AP<br>
decoding has been improved and extended.<br>
<br>
FT8: Decoding is now spread over three intervals. The first<br>
starts at t = 11.8 s into an Rx sequence and typically yields<br>
around 85% of the possible decodes for the sequence. You<br>
therefore see most decodes much earlier than before. A second<br>
processing step starts at 13.5 s, and the final one at 14.7 s.<br>
Overall decoding yield on crowded bands is improved by 10% or<br>
more. (Systems with receive latency greater than 0.2 s will see<br>
smaller improvements, but will still see many decodes earlier<br>
than before.)<br>
<br>
JT4: Formatting and display of Averaged and Deep Search decodes<br>
has been cleaned up and made consistent with other modes. JT4<br>
remains the digital mode of choice for EME and other extreme<br>
weak-signal work on microwave bands.<br>
<br>
JT65: Many improvements for Averaged and Deep Search decodes and<br>
their display to the user. These improvements are particularly<br>
important for EME on VHF and UHF bands.<br>
<br>
WSPR: Significant improvements have been made to the WSPR<br>
decoder's sensitivity, its ability to cope with many signals in<br>
a crowded sub-band, and its rate of undetected false decodes.<br>
We now use up to three decoding passes. Passes 1 and 2 use<br>
noncoherent demodulation of single symbols and allow for<br>
frequency drifts up to ±4 Hz in a transmission. Pass 3 assumes<br>
no drift and does coherent block detection of up to three<br>
symbols. It also applies bit-by-bit normalization of the<br>
single-symbol bit metrics, a technique that has proven helpful<br>
for signals corrupted by artifacts of the subtraction of<br>
stronger signals and also for LF/MF signals heavily contaminated<br>
by lightning transients. With these improvements the number of<br>
decodes in a crowded WSPR sub-band typically increases by 10 to<br>
15%.<br>
<br>
- New format for "EU VHF Contest" Tx2 and Tx3 messages<br>
<br>
When "EU VHF Contest" is selected, the Tx2 and Tx3 messages<br>
(those conveying signal report, serial number, and 6-character<br>
locator) now use hashcodes for both callsigns. This change is<br>
NOT backward compatible with earlier versions of _WSJT-X_, so<br>
all users of EU VHF Contest messages should be sure to upgrade<br>
to versiion 2.2.0.<br>
<br>
- Accessibility<br>
<br>
Keyboard shortcuts have been added as an aid to accessibility:<br>
Alt+R sets Tx4 message to RR73, Ctrl+R sets it to RRR.<br>
<br>
As an aid for partial color-blindness, the "inverted goal posts"<br>
marking Rx frequency on the Wide Graph's frequency scale are now<br>
rendered in a darker shade of green.<br>
<br>
- Minor enhancements and bug fixes<br>
<br>
"Save None" now writes no .wav files to disk, even temporarily.<br>
<br>
An explicit entry for "WW Digi Contest" has been added to<br>
"Special operating activities" on the "Settings | Advanced" tab.<br>
<br>
Contest mode FT4 now always uses RR73 for the Tx4 message.<br>
<br>
The Status bar now displays the number of decodes found in the<br>
most recent Rx sequence.<br>
<br>
Release candidate WSJT-X 2.2.0-rc1 will be available for beta-testing<br>
for one month starting on May 10, 2020. We currently plan a General<br>
Availability (GA) release of WSJT-X 2.2.0 on June 1, 2020.<br>
<br>
For those looking even farther ahead: We are well along in the<br>
development of two new modes designed for the LF and MF bands. One<br>
mode is for WSPR-like activity and one for making 2-way QSOs. Both<br>
use Low-density Parity Check (LDPC) codes, 4-GFSK modulation, and<br>
two-minute T/R sequences. The QSO mode reaches threshold SNR<br>
sensitivity around -31 dB on the AWGN channel, and the WSPR-like mode<br>
better than -32 dB.<br>
<br>
With best wishes,<br>
<br>
-- Joe, K1JT, Steve, K9AN, and Bill, G4WJS<br>
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