[aprssig] APRS Voice Alert

Robert Bruninga bruninga at usna.edu
Tue Sep 6 14:16:56 CDT 2005

One problem with Voice Alert in Europe is
that I'm not sure what tone they use.

We use 100 Hz here in the USA, but since
many of the AC Power Grid in Europe is
at 50 Hz, this make PL 100 practically useless
in Europe.  I have seen references to maybe
136.5 Hz, but then I have also made the mistake
of writing 123 Hz sometimes.  And of course,
unless everyone uses the same tone on the
same continent, then it really doesn't work 
for its intended purpose.

So, if anyone on this list uses APRS Voice
Alert in Europe, tell us what tone they use.


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