mirror of https://github.com/saitohirga/WSJT-X.git
97 lines
4.2 KiB
Plaintext
97 lines
4.2 KiB
Plaintext
=== New in Version {VERSION}
|
|
|
|
*Improvements to decoders*
|
|
|
|
*FT4:* Corrected bugs that prevented AP (_a priori_) decoding and/or
|
|
multi-pass decoding in some circumstances. Improved and extended the
|
|
algorithm for AP decoding.
|
|
|
|
*FT8:* Decoding is now spread over three intervals. The first starts
|
|
11.8 s into an Rx sequence and typically yields around 85% of the
|
|
possible decodes, so you 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.
|
|
|
|
SNR estimates no longer saturate at +20 dB, and large signals in the
|
|
passband no longer cause the SNR of weaker signals to be biased low.
|
|
Times written to cumulative journal file ALL.TXT are now correct even
|
|
when the decode occurs after the T/R sequence boundary. In FT8
|
|
DXpedition Mode, AP decoding is now implemented for Hounds when the
|
|
Fox has a compound callsign.
|
|
|
|
|
|
*JT4:* Formatting and display of averaged and Deep Search decodes has
|
|
been cleaned up and made consistent with other modes used for EME and
|
|
extreme weak-signal work on microwave bands.
|
|
|
|
*JT65:* Many improvements have been made for averaged and Deep Search
|
|
decodes, and their display to the user. For details see <<VHF_JT65,JT65>>
|
|
in the <<VHF_AND_UP,VHF+ Features>> section of this guide.
|
|
|
|
*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 message format:* 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. See <<CONTEST_MSGS,Contest Messages>> for details.
|
|
|
|
*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.
|
|
|
|
- The contest mode FT4 now always uses RR73 for the Tx4 message.
|
|
|
|
- *Keyboard shortcuts* have been added as an aid to accessibility:
|
|
*Alt+R* sets Tx4 message to RR73, *Ctrl+R* sets it to RRR.
|
|
|
|
- The *Status bar* now displays the number of decodes found in the
|
|
most recent Rx sequence.
|
|
|
|
- As an aid for partial color-blindness, the "`inverted goal posts`"
|
|
marking Rx frequency on the Wide Graph's frequency scale are now in a
|
|
darker shade of green.
|
|
|
|
=== Documentation Conventions
|
|
|
|
In this manual the following icons call attention to particular types
|
|
of information:
|
|
|
|
NOTE: *Notes* containing information that may be of interest to
|
|
particular classes of users.
|
|
|
|
TIP: *Tips* on program features or capabilities that might otherwise be
|
|
overlooked.
|
|
|
|
IMPORTANT: *Warnings* about usage that could lead to undesired
|
|
consequences.
|
|
|
|
=== How You Can Contribute
|
|
|
|
_WSJT-X_ is part of an open-source project released under the
|
|
{gnu_gpl} (GPLv3). If you have programming or documentation skills or
|
|
would like to contribute to the project in other ways, please make
|
|
your interests known to the development team. The project's
|
|
source-code repository can be found at {devrepo}, and communication
|
|
among the developers takes place on the email reflector {devmail}.
|
|
Bug reports and suggestions for new features, improvements to the
|
|
_WSJT-X_ User Guide, etc., may be sent there as well. You must join
|
|
the group before posting to the email list.
|