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[aprssig] APRS Voice Alert

A.J. Farmer (AJ3U) farmer.aj at gmail.com
Fri Sep 9 02:20:07 UTC 2005

I was referring to being able to receive voice alert packets, not
transmit.  I thought that was what he was asking.

On 9/8/05, Wes Johnston <aprs at kd4rdb.com> wrote:
> 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.
> Wes
> 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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A.J. Farmer, AJ3U

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