[aprssig] APRS Voice Alert

Robert Bruninga bruninga at usna.edu
Sat Sep 10 15:29:00 CDT 2005


Using 100 HZ tone in europe, do you hear many
squelch mistakes due to 50 Hz hum on some systems?


>>> agara at kantauri.com 09/10/05 3:28 PM >>>
I'm Asier, EB2FGI from Spain.
Usually, when I'm in mobile I use Voice Alert  (I think I'm the unique 
ham in Europe using Alert Voice because never I contacted  an other ham 
with this system, but I continue trying ...) and I use 100.0 tone.

Asier, EB2FGI
Robert Bruninga wrote:

>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.
>aprssig mailing list
>aprssig at lists.tapr.org 

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