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[aprssig] APRS on all Radios!!!!

Bob Bruninga bruninga at usna.edu
Sun Aug 17 15:10:59 UTC 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!

Interesting.
Bob, WB4APR

> 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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