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Joe Taylor 2018-09-13 15:33:42 -04:00
parent ab2708aa44
commit 83bf281a1b
1 changed files with 12 additions and 8 deletions
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lib/77bit/77bit.txt
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@ -1,9 +1,10 @@
Proposed new message types have a 77-bit payload. For most purposes
these are interpreted as 3 bits (i3) for "message type" and 74
information bits. Any message type that uses fewer than 74
information bits can assign the remaining bits to define message
subtypes. For example, Type i3=0 uses 71 information bits and the
remaining 3 bits, here called n3, define 8 subtypes.
Starting with WSJT-X 2.0, the FT8 and MSK144 protocols convey a 77-bit
payload. For most purposes these bits are interpreted as 3 bits (i3)
for message type and 74 for user information. Any message type that
uses fewer than 74 information bits can assign the remaining bits to
define message subtypes. For example, Type i3=0 uses 71 information
bits and the remaining 3 bits, here called n3, define 8 possible
subtypes.
----------------------------------------------------------------------------------
i3.n3 Example message Bits Total Purpose
@ -33,6 +34,9 @@ In case we need them, later:
NB: three 74-bit message types and two 71-bit message subtypes are still TBD.
----------------------------------------------------------------------------------
The 28-bit fields normally used for callsigns are configured rather
differently from before.
Facts about the 28-bit integers used to encode standard callsigns:
2^28 = 268,435,456 Available values
37*36*10*27*27*27 = 262,177,560 Used for standard callsigns
@ -43,13 +47,13 @@ Facts about the 28-bit integers used to encode standard callsigns:
2,063,592 available for CQ, CQ nnn, CQ xxxx, QRZ, ...
Further details:
Further details on message types:
-----------------------------------------------------------------------------
i3.n3
-----------------------------------------------------------------------------
0.0 Free text, up to 13 characters.
0.1 DXpedition mode as developed for KH1/KH7Z.
0.1 DXpedition mode, as developed for use by KH1/KH7Z.
0.2 Report, QSO serial number up to 4095, 6-character grid, and Roger
for EU VHF contests.