[aprssig] Voice Alert

[Stephen H. Smith]

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.) 



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