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[aprssig] APRS Voice Alert

Wes Johnston aprs at kd4rdb.com
Fri Sep 9 02:10:07 UTC 2005

Careful there.... your TNC needs to hear enough to know when the channel
is in use so as not to TX.

No TNC on a 2nd receiver in the car is a good solution though.

A.J. Farmer (AJ3U) wrote:
> On 9/8/05, Steve Huston <huston at astro.princeton.edu> wrote:
> You don't need a TNC to "hear" the packet.  This is just a PL/CTCSS
> function, it has nothing to do with a TNC.  All you need is your
> receiver tuned to 144.39 with a CTCSS of 100.  All of the transmitters
> that are transmitting normally without a PL of 100 will be muted by
> your receiver so your your receiver will be silent the majority of the
> time.  The only time you will hear packet bursts is if a transmitter
> is within simplex range and is transmitting with a PL of 100.

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