ну, бэлин, вотэто валит :)
aprs.org в помощь, но там полнейший хаос в этом плане...

у меня только ссылка на первую ревизию:
ftp://ftp.tapr.org/aprssig/aprsspec/...01/APRS101.pdf

есть еще какой-то ресурс-мусоросборник:
http://www.dmoz.org/Recreation/Radio.../Packet_Radio/

---------- Добавлено в 15:49 ---------- Предыдущее сообщение было размещено в 15:47 ----------

вот, кусок лога гейта, там символ-в-символ есть пакеты, кот. он отсылает в радио и получает из IS:

12:41:05 (IS->RF) Received packet: "UT2UU-S>APDG01,TCPIP*,qAC,UT2UU-GS:;UT2UU B *311241z5028.93ND03035.81EaRNG0002 440 Voice 434.56250MHz +0.0000MHz".
12:41:05 (IS->RF) Packet SRC parse error, dropped.
12:41:07 (IS->RF) Received packet: "UT3UX>APU25N,WIDE2-2,qAR,UT5UAK-10:=5023.79N\03037.69E-".
12:41:07 (IS->RF) Packet allowed by IS->RF filter rule: 1
12:41:07 (RF) Sending 3-rd party packet: "APMI010UT4UOF0WIDE2 1<03><F0>}UT3UX>APU25N,TCPIP,UT4UOF*:=5023.79N\03037.69E-".
12:41:15 (IS->RF) Received packet: "UT2UU-B>APDG02,TCPIP*,qAC,UT2UU-BS:!5028.93ND03035.81E&RNG0002 440 Voice 434.56250MHz +0.0000MHz".
12:41:15 (IS->RF) Packet SRC parse error, dropped.
12:41:19 (IS->RF) Received packet: "UT5UKA-1>APU25N,TCPIP*,qAC,T2IRELAND:=5025.05N/03032.24E#PHG10302/ 431.325MHz FM 1200bps {UIV32N}".
12:41:19 (IS->RF) Packet allowed by IS->RF filter rule: 1
12:41:19 (RF) Sending 3-rd party packet: "APMI010UT4UOF0WIDE2 1<03><F0>}UT5UKA-1>APU25N,TCPIP,UT4UOF*:=5025.05N/03032.24E#PHG10302/ 431.325MHz FM 1200bps {UIV32N}".
12:41:29 (IS->RF) Received packet: "UT5UKA>APU25N,WIDE1-1,WIDE2-2,qAR,UT5UAK-10:=5025.48N/03027.05EyPHG22302/ digi&igate 144.800 FM1200bps {UIV32N}".
12:41:29 (IS->RF) Packet allowed by IS->RF filter rule: 1
12:41:29 (RF) Sending 3-rd party packet: "APMI010UT4UOF0WIDE2 1<03><F0>}UT5UKA>APU25N,TCPIP,UT4UOF*:=5025.48N/03027.05EyPHG22302/ digi&igate 144.800 FM1200bps {UIV32N}".
12:41:46 (IS->RF) Received packet: "UR5KIP-S>APDG01,TCPIP*,qAC,UR5KIP-GS:;UR5KIP B *311241z5026.83ND03029.38EaRNG0006 440 Voice 433.6875MHz +0.0000MHz".
12:41:46 (IS->RF) Packet SRC parse error, dropped.
12:41:56 (IS->RF) Received packet: "UR5KIP-B>APDG02,TCPIP*,qAC,UR5KIP-BS:!5026.83ND03029.38E&RNG0006 440 Voice 433.6875MHz +0.0000MHz".
12:41:56 (IS->RF) Packet SRC parse error, dropped.