[aprssig] APRS messages being seen by "base" station

Stephen H. Smith wa8lmf2 at aol.com
Wed Jul 25 17:07:09 EDT 2007

Bernard Tyers wrote:
> APRS sees every station with "-XX" as a sub-station, even if the 
> message originated from a sub-station?
> Apologies if I am not getting the message (hi hi) here!
> thanks in advance,
> bernard

There are no "sub-stations". 

ALL stations are co-equal in the AX25 packet protocol used by APRS.    A 
call with just the callsign alone ( i.e.  WA8LMF ) is actually  the call 
with an SSID of zero (i.e. WA8LMF-0)  and is treated the same as any 
other SSID.   (The SSID of -0 is implicit and handled as such,  there 
even if not explicitly specified.)


Stephen H. Smith    wa8lmf (at) aol.com
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