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Starting on some User Guide additions and edits. This is work in progress!

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Joe Taylor 2022-06-02 07:46:23 -04:00
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doc/user_guide/en/new_features.adoc
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[[NEW_FEATURES]]
=== New in Version {VERSION_MAJOR}.{VERSION_MINOR}
_WSJT-X 2.5_ introduces an enhanced Q65 decoder that measures and
compensates for linear frequency drifts of Q65 signals. Activate this
feature by setting a spinner control *Max Drift* on the _WSJT-X_ main
window to a number greater than 0. We suggest a setting of 10 for
submode Q65-60A, the recommended submode for EME on 50 and 144 MHz,
which will accommodate drift rates up to 20 Hz/minute. Similarly, we
suggest *Max Drift* = 40 for submode Q65-15C, used for for 10 GHz QSOs
(up to 900 km) via aircraft scatter and drift rates up to about 20
Hz/s. When *Max Drift* = 50 the decoder will use an enhanced algorithm
to compensate for larger aircraft scatter drift rates, successful
decodes with this algorithm are tagged with a `q5` indicator.
_WSJT-X 2.6_ implements features in support of the ARRL International
Digital Contest. This contest's scoring is distance based, so the
*Call 1st* checkbox is replaced by a drop-down control offering *CQ
Max Dist* as an alternative. A new window labeled *Active Stations*
displays a list of received but unworked callsigns sorted in
decreasing order of potential contest points. See Section 7.4 for
more details on these features.
Decoding performance for FT8 and Q65 has been improved for situations
where _a priori_ (AP) information is available.
*Echo* mode now offers a button labeled *Clear Avg* and produces
reliable measurements of SNR and Doppler spread. The related
*Measure* function can be used to measure these quantities for a
received unmodulated carrier -- for example, a key-down test signal
emitted by another station and reflected from the Moon.
New buttons on the main window allow quick changes between the modes
FT4, FT8, MSK144, Q65, and JT65. Another button allows toggling the
FT8 Hound mode ON or OFF.
Optional highlighting is provided for DX Call and DX Grid, and for
messages containing RR73 or 73.
New options are provided for writing to file ALL.TXT. You can request
starting a suitably labeled new file every month or every year, and you
can disable writing altogether.
On the Windows platform only, _WSJT-X 2.5_ installations now include
an early version of _MAP65 3.0_. This program works together with
suitable hardware that converts RF to baseband. The hardware/software
combination implements a wideband, highly optimized receiver for the
Q65 and JT65 protocols, with matching transmitting features that
require a standard SSB transceiver. _MAP65_ is effective in both
single-polarization and dual-polarization systems. If two
polarization channels are available, _MAP65_ determines and matches
the linear polarization angle of each decodable signal. This
capability provides a major advantage for efficient EME communication
on bands up to 432 MHz. A single-channel _MAP65_ system works
extremely well for EME on 1296 MHz and higher bands, displaying all
signals in a 90 kHz sub-band and decoding all the Q65 and JT65
signals.