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More editing of User Guide.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7335 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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@ -32,7 +32,7 @@ End of line information::
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`f` - Franke-Taylor or Fano algorithm +
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`f` - Franke-Taylor or Fano algorithm +
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`M` - Message length (characters) +
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`M` - Message length (characters) +
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`N` - Number of Rx intervals or frames averaged +
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`N` - Number of Rx intervals or frames averaged +
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`R` - QRA64 _a priori_ return code +
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`R` - Amount of _a priori_ information used by decoder +
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`T` - Length of analyzed region (s)
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`T` - Length of analyzed region (s)
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=== Reference Spectrum
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=== Reference Spectrum
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@ -155,12 +155,14 @@ image::JT65B.png[align="center",alt="JT65B"]
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=== QRA64
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=== QRA64
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QRA64 is an experimental mode in the Version 1.7 alpha release of
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QRA64 is an experimental mode in the Version 1.7 alpha release of
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_WSJT-X_. In most ways you will find operation of QRA64 similar to
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_WSJT-X_. The mode is designed especially for EME on VHF and higher
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JT65. The following screen shot shows an example of a QRA64C
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bands; operation is generally similar to JT65. The following screen
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transmission from DL7YC recorded at G3WDG over the EME path at 24 GHz,
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shot shows an example of a QRA64C transmission from DL7YC recorded at
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at a time when Doppler spread on the path was 78 Hz. The red curve
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G3WDG over the EME path at 24 GHz. Doppler spread on the path was 78
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with a peak at 967 Hz shows that the decoder has detected its
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Hz, so although the signal is reasonable strong its tones are
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synchronizing symbols, and the decode is successful.
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broadened enough to make them hardto see on the waterfall. The red
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curve shows that the decoder has achieved synchronization with a
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signal at about 970 Hz.
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image::QRA64.png[align="center",alt="QRA64"]
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image::QRA64.png[align="center",alt="QRA64"]
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@ -27,7 +27,6 @@ program qra64sim
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call getarg(1,msg)
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call getarg(1,msg)
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call getarg(2,csubmode)
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call getarg(2,csubmode)
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mode64=2**(ichar(csubmode)-ichar('A'))
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mode64=2**(ichar(csubmode)-ichar('A'))
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print*,csubmode,' ',mode64
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call getarg(3,arg)
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call getarg(3,arg)
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read(arg,*) nsigs
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read(arg,*) nsigs
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call getarg(4,arg)
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call getarg(4,arg)
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