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Updates to User Guide with a new QRA64C example.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7332 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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Joe Taylor 2016-11-22 17:48:59 +00:00
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2 changed files with 6 additions and 11 deletions
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doc/user_guide/en/vhf-features.adoc
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@ -155,17 +155,12 @@ image::JT65B.png[align="center",alt="JT65B"]
=== QRA64 === QRA64
QRA64 is an experimental mode in the Version 1.7 alpha release of QRA64 is an experimental mode in the Version 1.7 alpha release of
_WSJT-X_. Some details of the protocol are still subject to change, _WSJT-X_. In most ways you will find operation of QRA64 similar to
and some features of the decoder will almost surely change. In most JT65. The following screen shot shows an example of a QRA64C
ways you will find operation of QRA64 similar to JT65. The following transmission from DL7YC recorded at G3WDG over the EME path at 10 GHz,
screen shot shows examples of two QRA64A transmissions recorded over at a time when Doppler spread on the path was 82 Hz. The red curve
the EME path. The first (at 1554 UTC) shows G4SWX transmitting to with a peak at 967 Hz shows that the decoder has detected its
K1JT at 144 MHz; the second shows VK7MO transmitting to G3WDG at 10 synchronizing symbols, and the decode is successful.
GHz. Notice the small red curve plotted below frequency 1000 Hz in
the Wide Graph. Even though the VK7MO signal is hard to discern in
the waterfall, the red curve shows that the decoder has accurately and
reliably detected its synchronizing symbols, and the decode is
successful.
image::QRA64.png[align="center",alt="QRA64"] image::QRA64.png[align="center",alt="QRA64"]