[aprssig] APRStt (APRS touchtone DTMF)
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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