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85 lines
3.9 KiB
Plaintext
85 lines
3.9 KiB
Plaintext
Starting with WSJT-X 2.0, the FT8 and MSK144 protocols convey a 77-bit
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payload. For most purposes these bits are interpreted as 3 bits (i3)
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for message type and 74 for user information. Any message type that
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uses fewer than 74 information bits can assign the remaining bits to
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define message subtypes. For example, Type i3=0 uses 71 information
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bits and the remaining 3 bits, here called n3, define 8 possible
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subtypes.
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----------------------------------------------------------------------------------
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i3.n3 Example message Bits Total Purpose
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----------------------------------------------------------------------------------
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0.0 FREE TEXT MSG 71 71 Free text
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0.1 K1ABC RR73; W9XYZ <KH1/KH7Z> -12 28 28 10 5 71 DXpedition Mode
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0.2 PA3XYZ/P R 590003 IO91NP 28 1 1 3 12 25 70 EU VHF contest
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0.3 WA9XYZ KA1ABC R 16A EMA 28 28 1 4 3 7 71 ARRL Field Day
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0.4 WA9XYZ KA1ABC R 32A EMA 28 28 1 4 3 7 71 ARRL Field Day
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0.5 123456789ABCDEF012 71 71 Telemetry (18 hex)
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0.6 K1ABC RR73; CQ W9XYZ EN37 28 28 15 71 Contesting
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0.7 ... tbd
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1 WA9XYZ/R KA1ABC/R R FN42 28 1 28 1 1 15 74 Standard msg
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2 PA3XYZ/P GM4ABC/P R JO22 28 1 28 1 1 15 74 EU VHF contest
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3 TU; W9XYZ K1ABC R 579 MA 1 28 28 1 3 13 74 ARRL RTTY Roundup
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4 <WA9XYZ> PJ4/KA1ABC RR73 12 58 1 2 1 74 Nonstandard calls
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5 TU; W9XYZ K1ABC R-07 FN 1 28 28 1 7 9 74 WWROF contest ?
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6 ... tbd
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7 ... tbd
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----------------------------------------------------------------------------------
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NB: three 74-bit message types and two 71-bit message subtypes are still TBD.
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----------------------------------------------------------------------------------
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The 28-bit fields normally used for callsigns are configured rather
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differently from before.
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Facts about the 28-bit integers used to encode standard callsigns:
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2^28 = 268,435,456 Available values
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37*36*10*27*27*27 = 262,177,560 Used for standard callsigns
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-----------
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6,257,896 Difference
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2^22 = 4,194,304 Used for 22-bit hash codes
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-----------
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2,063,592 available for CQ, CQ nnn, CQ xxxx, QRZ, ...
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Further details on message types:
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-----------------------------------------------------------------------------
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i3.n3
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-----------------------------------------------------------------------------
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0.0 Free text, up to 13 characters.
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0.1 DXpedition mode, as developed for KH1/KH7Z.
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0.2 Report, QSO serial number from 0001 to 4095, 6-character grid, and Roger
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for EU VHF contests.
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0.3 ARRL Field Day exchange (1-16 transmitters).
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0.4 ARRL Field Day exchange (17-32 transmitters).
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0.5 Telemetry, 71 bits
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1. Two callsigns, Roger, and grid or report. Each callsign may have
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an appended "/R" to indicate Rover status for NA VHF contests.
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Either callsign may be nonstandard if enclosed in angle brackets,
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for example <YW18FIFA>.
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2. Same as Type 1, but uses /P instead of /R. For European VHF contests.
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3. Standard message for ARRL RTTY Roundup. Optional "TU;" at
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beginning to finish a previous QSO; then two standard callsigns,
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optional "R", a 3-bit report (529 to 599), and 13 bits to indicate
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US state, Canadian province/territory, or DX serial number from
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0001 to 7999.
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4. One hashed call or "CQ"; one compound or nonstandard call with up
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to 11 characters; and (if not "CQ") an optional RRR, RR73, or 73.
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---------------------------------------------------------------------------
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The following are tentative and not included in first release.
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5. CQ WW RTTY - US/Can: RST CQZ state/prov R 579 5 NJ R1 r3 z6 u7
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DX: RST + CQzone R 559 15 R1 r3 z6
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6. CQ WPX RTTY - RST + serial R 589 0013 R1 r3 n12
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