From 7266d407ff6f06f20dc1aebd787efea62499ca37 Mon Sep 17 00:00:00 2001 From: Joe Taylor Date: Fri, 22 Jun 2018 16:36:14 -0400 Subject: [PATCH] Amended rules for 77-bit message types. --- lib/77bit/77bit.txt | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/lib/77bit/77bit.txt b/lib/77bit/77bit.txt index 10e70685d..36087f48a 100644 --- a/lib/77bit/77bit.txt +++ b/lib/77bit/77bit.txt @@ -10,19 +10,30 @@ i3.n3 Example message Bits Total Purpose 0.2 PA3XYZ/P R 590003 IO91NP 28 1 1 3 12 25 70 EU VHF contest 0.3 WA9XYZ KA1ABC R 16A EMA 28 28 1 4 3 7 71 ARRL Field Day 0.4 WA9XYZ KA1ABC R 32A EMA 28 28 1 4 3 7 71 ARRL Field Day -0.5 71-bit telemetry 71 71 TBD +0.5 0123456789abcdef01 71 71 Telemetry (18 hex) +0.6 1 WA9XYZ/R KA1ABC/R R FN42 28 1 28 1 1 15 74 Standard msg 2 TU; W9XYZ K1ABC R 579 MA 1 28 28 1 3 13 74 ARRL RTTY contest 3 PA3XYZ/P GM4ABC/P R JO22 28 1 28 1 1 15 74 EU VHF contest -4 PJ4/KA1ABC R-11 13 53 1 1 6 74 Nonstandard calls +4 PJ4/KA1ABC RR73 13 58 1 2 74 Nonstandard calls 5 ... 6 7 ---------------------------------------------------------------------------------- +In case we need them, later: + +5 TU; W9XYZ K1ABC R 579 8 MA 1 28 28 1 3 6 7 74 CQ WW RTTY +6 TU; W9XYZ K1ABC R 579 MA 1 28 28 1 3 13 74 CQ WPX RTTY +---------------------------------------------------------------------------------- NB: three 74-bit message types and two 71-bit message subtypes are still TBD. ---------------------------------------------------------------------------------- +The 28-bit callsign field includes about 19 million impossible "calls" +that start with three digits. That's more than 2^24 = 17,777,216, so +these values could be used to implement a 24-bit CRC -- in addition to the +"CQ xx" and "CQ nnn" forms, possibly enhanced a bit further. + Further details: 0.0 Free text, up to 13 characters. @@ -46,7 +57,13 @@ Further details: 3. Same as Type 1, but uses /P instead of /R. For European VHF contests. -4. One nonstandard call with up to 10 characters, one hashed call, Roger, - and signal report. +4. One nonstandard call with up to 11 characters, one hashed call, + followed by , RRR, RR73, or 73. +The following are tentative, not to be included in first release: + +5. CQ WW RTTY - US/Can: RST CQZ state/prov R 579 5 NJ R1 r3 z6 u7 + DX: RST + CQzone R 559 15 R1 r3 z6 + +6. CQ WPX RTTY - RST + serial R 589 0013 R1 r3 n12