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[aprssig] Voice Alert

Stephen H. Smith wa8lmf2 at aol.com
Mon Apr 23 16:01:18 UTC 2007

Jan T. Pharo wrote:
> "Bob Bruninga " <bruninga at usna.edu>, Mon, 23 Apr 2007 09:51:27 -0400
> (EDT):
>> The purpose of Voice Alert is to be aware of being in simplex range of another APRS voice-alert station, and if you want to chat, to call each other and QSY for the chat.
>> See the web page:
>> http://www.ew.usna.edu/~bruninga/voiceAlert.htm
> a short quoting from the web page:
> ||and set CTCSS-100 (136 in Europe)
> Just for curiosity (and because the question has come up in the
> TM-D700 Yahoo group): Why is another subtone than 100 Hz suggested for
> Europe?

Supposedly the second harmonic of 50 hz AC power in Europe (power supply 
ripple) might cause false decodes with 100 Hz CTCSS. (North American 
power is all 60 Hz.) 


Stephen H. Smith    wa8lmf (at) aol.com
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