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More work on User Guide for v2.2.0.

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Joe Taylor 2020-05-01 11:15:43 -04:00
parent 11633afb28
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2 changed files with 28 additions and 36 deletions
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doc/user_guide/en/make-qso.adoc
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@ -82,7 +82,7 @@ fully automated QSOs.
[[CONTEST_MSGS]] [[CONTEST_MSGS]]
=== Contest Messages === Contest Messages
The new FT4, FT8, and MSK144 protocols support special messages optimized The FT4, FT8, and MSK144 protocols support special messages optimized
for *NA VHF* and *EU VHF* contests. FT8 also supports messages for for *NA VHF* and *EU VHF* contests. FT8 also supports messages for
*ARRL Field Day* and the *ARRL RTTY Roundup*. The decoders recognize *ARRL Field Day* and the *ARRL RTTY Roundup*. The decoders recognize
and decode these messages at any time. Configure the program to and decode these messages at any time. Configure the program to

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doc/user_guide/en/new_features.adoc
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@ -3,31 +3,32 @@
*Improvements to decoders* *Improvements to decoders*
*FT4:* Corrected bugs that prevented AP (_a priori_) decoding and/or *FT4:* Corrected bugs that prevented AP (_a priori_) decoding and/or
multi-pass decoding in some circumstances. Improved the algorithm for multi-pass decoding in some circumstances. Improved and extended the
AP decoding. algorithm for AP decoding.
*FT8:* Decoding is now spread over three intervals. The first starts *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 11.8 s into an Rx sequence and typically yields around 85% of the
possible decodes, so you see all of these decodes much earlier than possible decodes, so you see most decodes much earlier than before. A
before. A second processing step starts at 13.5 s, and the final one second processing step starts at 13.5 s, and the final one at 14.7 s.
at 14.7 s. Overall decoding yield on the most crowded bands is Overall decoding yield on crowded bands is improved by 10% or more.
improved by 10% or more. Systems with receive latency greater than Systems with receive latency greater than 0.2 s will see smaller
0.2 s will see smaller improvements, but will still see many decodes improvements, but will still see many decodes earlier than before.
earlier than before. In FT8 DXpedition Mode, AP decoding is now
implemented for Hounds when the Fox has a compound callsign.
SNR estimates no longer saturate at +20 dB, and large signals in the 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. 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 Times written to cumulative journal file ALL.TXT are now correct even
when the decode occurs after the T/R sequence boundary. 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 *JT4:* Formatting and display of averaged and Deep Search decodes has
been cleaned up and made consistent with other modes used for EME and been cleaned up and made consistent with other modes used for EME and
extreme weak-signal work at VHF and above. extreme weak-signal work on microwave bands.
*JT65:* Many improvements have been made for averaged and Deep Search *JT65:* Many improvements have been made for averaged and Deep Search
decodes and their display to the user. For details see <<VHF_JT65,JT65>> decodes, and their display to the user. For details see <<VHF_JT65,JT65>>
in the <<VHF_AND_UP,VHF+ Features>> section. in the <<VHF_AND_UP,VHF+ Features>> section of this guide.
*WSPR:* Significant improvements have been made to the WSPR decoder's *WSPR:* Significant improvements have been made to the WSPR decoder's
sensitivity, its ability to cope with many signals in a crowded sensitivity, its ability to cope with many signals in a crowded
@ -36,37 +37,24 @@ three decoding passes. Passes 1 and 2 use noncoherent demodulation of
single symbols and allow for frequency drifts up to ±4 Hz in a single symbols and allow for frequency drifts up to ±4 Hz in a
transmission. Pass 3 assumes no drift and does coherent block transmission. Pass 3 assumes no drift and does coherent block
detection of up to three symbols. It also applies bit-by-bit detection of up to three symbols. It also applies bit-by-bit
normalization of the single-symbol bit metrics, which has proven normalization of the single-symbol bit metrics, a technique that has
helpful for signals corrupted by artifacts of the subtraction of proven helpful for signals corrupted by artifacts of the subtraction
stronger signals and also for LF/MF signals heavily contaminated by of stronger signals and also for LF/MF signals heavily contaminated by
lightning transients. With these improvements the number of decodes in a lightning transients. With these improvements the number of decodes
crowded WSPR sub-band typically increases by 10 to 15%. in a crowded WSPR sub-band typically increases by 10 to 15%.
*New message format:* When *EU VHF Contest* is selected, the Tx2 and *New message format:* When *EU VHF Contest* is selected, the Tx2 and
Tx3 messages -- those conveying signal report, serial number, and Tx3 messages -- those conveying signal report, serial number, and
6-character locator -- now use hashcodes for both callsigns . This 6-character locator -- now use hashcodes for both callsigns . This
change is not backward compatible with earlier versions of _WSJT-X_. change is *not* backward compatible with earlier versions of _WSJT-X_, so
See <<CONTEST_MSGS,Contest Messages>> for details. all users of *EU VHF Contest* messages should be sure to upgrade to
versiion 2.2.0. See <<CONTEST_MSGS,Contest Messages>> for details.
*New modes FT4W and FT4S* are now available for use with extremely
weak signals on the LF and MF bands.
*FT4W* behaves like WSPR but uses different schemes for coding and
modulation. On the AWGN (Additive White Gaussian Noise) channel and
with 2-minute T/R sequences, FT4W is about 1.5 dB more sensitive than
WSPR, even with the enhanced decoder outlined above. With 5-minute
T/R sequences FT4W reaches a threshold sensitivity close to -37 dB.
*FT4S* is desighned for 2-way QSOs on the 620 amd 2200 m bands. It
uses the same message formats as FT4, FT8, and MSK144, but different
coding and modulation and much slower T/R sequences lasting 2 minutes.
We intend FT4S to be a replacement for JT9 on the LF and MF bands.
*Minor enhancements and bug fixes* *Minor enhancements and bug fixes*
- *Save None* now writes no .wav files to disk, even temporarily. - *Save None* now writes no .wav files to disk, even temporarily.
- An explicit entry *WW Digi Contest* has been added to *Special - An explicit entry for *WW Digi Contest* has been added to *Special
operating activities* on the *Settings | Advanced* tab. operating activities* on the *Settings | Advanced* tab.
- The contest mode FT4 now always uses RR73 for the Tx4 message. - The contest mode FT4 now always uses RR73 for the Tx4 message.
@ -77,6 +65,10 @@ We intend FT4S to be a replacement for JT9 on the LF and MF bands.
- The *Status bar* now displays the number of decodes found in the - The *Status bar* now displays the number of decodes found in the
most recent Rx sequence. 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 === Documentation Conventions
In this manual the following icons call attention to particular types In this manual the following icons call attention to particular types