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"New in Version 2.5.0" added to the User Guide.

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Joe Taylor 2021-05-30 14:40:57 -04:00
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doc/user_guide/en/new_features.adoc
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[[NEW_FEATURES]] [[NEW_FEATURES]]
=== New in Version {VERSION} === New in Version {VERSION}
_WSJT-X 2.4.0_ introduces *Q65*, a new digital protocol designed for _WSJT-X 2.5.0_ introduces an enhanced Q65 decoder that measures and
minimal two-way QSOs over especially difficult propagation paths. On compensates for linear frequency drifts of Q65 signals. Activate this
paths with Doppler spread more than a few Hz, the weak-signal feature by setting a spinner control *Max Drift* on the _WSJT-X_ main
performance of Q65 is the best among all WSJT-X modes. 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.
Q65 uses message formats and sequencing identical to those used in On the Windows platform only, _WSJT-X 2.5.0_ installations now include
FST4, FT4, FT8, and MSK144. Submodes are provided with a wide variety an early version of _MAP65 3.0_. This program works together with
of tone spacings and T/R sequence lengths 15, 30, 60, 120, and 300 s. suitable hardware that converts RF to baseband. The hardware/software
A new, highly reliable list-decoding technique is used for messages combination implements a wideband, highly optimized receiver for the
that contain previously copied message fragments. Message averaging Q65 and JT65 protocols, with matching transmitting features that
is provided for situations where single transmissions are too weak or require a standard SSB transceiver. _MAP65_ is effective in both
signal enhancements too sparse for a signal to be decoded. 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.