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Minor tweak to User Guide. 

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7600 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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Joe Taylor 2017-03-09 21:56:25 +00:00
parent 5babb1c942
commit be0500dda6
1 changed files with 6 additions and 6 deletions
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12
doc/user_guide/en/protocols.adoc
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@ -285,12 +285,12 @@ inserts the implied "`R`".
MSK144 also supports short-form messages that can be used after QSO
partners have exchanged both callsigns. Short messages consist of 4
bits encoding a signal report, R+report, RRR, or 73, together with a
12-bit hash code based on the ordered pair of "`to`" and "`from`"
callsigns. Another specially designed LDPC (32,16) code provides
error correction, and an 8-bit synchronizing vector is appended to
make up a 40-bit frame. Short-message duration is thus 20 ms, and
short messages can be decoded from very short meteor pings.
bits encoding R+report, RRR, or 73, together with a 12-bit hash code
based on the ordered pair of "`to`" and "`from`" callsigns. Another
specially designed LDPC (32,16) code provides error correction, and an
8-bit synchronizing vector is appended to make up a 40-bit frame.
Short-message duration is thus 20 ms, and short messages can be
decoded from very short meteor pings.
The 72 ms or 20 ms frames of MSK144 messages are repeated without gaps
for the full duration of a transmission cycle. For most purposes, a