[aprssig] APRS on all Radios!!!!
bruninga at usna.edu
Sun Aug 17 11:10:59 EDT 2008
> In fact, we could make it by-directional and
> be full APRS on all voice repeaters.!...
> Could it simply be PSK-31 encoded? [subaudibly]
Using existing PSK31 and some clever translations for optimal varicode characters, the callsigns would be about 36 bits and a position to the nearest 6 feet on the globe would take about 64 bits. CSE/SPD would take 24 bits for a minimum length of about 124 bits or about 4 seconds. This is about the same average Packet throughput on the APRS channel!
> Remember, this is a UNIQUE sub-audible service
> on a VOICE repeater. Thus, the repeater
> dongle can FILTER, TRAP, and focus only on
> LOCAL APRS information only of immediate
> value in the coverage area of that repeater...
> If we used PSK-31 (sub audible) we would look
> carefully at the hamming coding to make sure
> we used an optimum format and did not just
> try to stuff APRS as-is into that pipe.
> Bob, WB4APR
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