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30 lines
1.6 KiB
Plaintext
30 lines
1.6 KiB
Plaintext
[[NEW_FEATURES]]
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=== New in Version {VERSION_MAJOR}.{VERSION_MINOR}
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_WSJT-X 2.5_ introduces an enhanced Q65 decoder that measures and
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compensates for linear frequency drifts of Q65 signals. Activate this
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feature by setting a spinner control *Max Drift* on the _WSJT-X_ main
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window to a number greater than 0. We suggest a setting of 10 for
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submode Q65-60A, the recommended submode for EME on 50 and 144 MHz,
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which will accommodate drift rates up to 20 Hz/minute. Similarly, we
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suggest *Max Drift* = 40 for submode Q65-15C, used for for 10 GHz QSOs
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(up to 900 km) via aircraft scatter and drift rates up to about 20
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Hz/s. When *Max Drift* = 50 the decoder will use an enhanced algorithm
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to compensate for larger aircraft scatter drift rates, successful
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decodes with this algorithm are tagged with a `q5` indicator.
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On the Windows platform only, _WSJT-X 2.5_ installations now include
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an early version of _MAP65 3.0_. This program works together with
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suitable hardware that converts RF to baseband. The hardware/software
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combination implements a wideband, highly optimized receiver for the
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Q65 and JT65 protocols, with matching transmitting features that
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require a standard SSB transceiver. _MAP65_ is effective in both
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single-polarization and dual-polarization systems. If two
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polarization channels are available, _MAP65_ determines and matches
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the linear polarization angle of each decodable signal. This
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capability provides a major advantage for efficient EME communication
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on bands up to 432 MHz. A single-channel _MAP65_ system works
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extremely well for EME on 1296 MHz and higher bands, displaying all
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signals in a 90 kHz sub-band and decoding all the Q65 and JT65
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signals.
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