[aprssig] APRStt (APRS touchtone DTMF)

Scott Miller scott at opentrac.org
Fri Sep 19 20:30:04 CDT 2008

> Good questions.  I have tried to get people who know these codes
> to provide the best recommendations.  Best we have come up with
> is to begin each APRS string with ##A or ##B or ##C depending of
> the APRS application.  The ## in many repeaters tells the
> repeater to ignore the following tones.  THen two of them
> improve that probabilty of detection.  The A or B or C indicates
> the type of APRS code to follow...

ALL of the commands for the ADS-SR1 start with ##.  It doesn't have any 
commands that use A, B, C, or D (it was easier to save CPU cycles and 
drop one filter) but I don't think it's safe to make assumptions about 
what DTMF codes you can use...


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