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Add basic info on definition of one of the "three extra bits".

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8505 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
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Joe Taylor 2018-02-13 15:55:10 +00:00
parent de143aa276
commit ebeab718d7
1 changed files with 5 additions and 3 deletions
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doc/user_guide/en/protocols.adoc
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@ -9,9 +9,11 @@ additional bit flags a message containing arbitrary alphanumeric text,
up to 13 characters. Special cases allow other information such as up to 13 characters. Special cases allow other information such as
add-on callsign prefixes (e.g., ZA/K1ABC) or suffixes (e.g., K1ABC/P) add-on callsign prefixes (e.g., ZA/K1ABC) or suffixes (e.g., K1ABC/P)
to be encoded. The basic aim is to compress the most common messages to be encoded. The basic aim is to compress the most common messages
used for minimally valid QSOs into a fixed 72-bit length. Information used for minimally valid QSOs into a fixed 72-bit length. The
payloads in FT8 include 3 additional bits (75 bits total), with information payload in FT8 includes 3 additional bits (75 bits total).
definitions yet to be defined. One of the added bits is used to flag special messages used by the
DXpedition station in FT8 DXpedition Mode. Uses for the remaining two
bits are yet to be defined.
A standard amateur callsign consists of a one- or two-character A standard amateur callsign consists of a one- or two-character
prefix, at least one of which must be a letter, followed by a digit prefix, at least one of which must be a letter, followed by a digit