On Mon, 3 Dec 2007 15:57:46 -0800, "Daniel W. Rouse Jr."
wrote:

In the area I am in--on frequency 151.1900 (CDF/Cal Fire dispatch, Monte
Vista), sometimes a radio transmission will be preceded by several DTMF
tones (touch-tone phone button tones). On other occasions, a radio
transmission will be preceded by two musical tones, about 1 second each,
with the first tone being higher than the second tone, almost sounds like
high pitched fog-horn type tones.

DTMF could be used for:

Auto Number Identification - ANI
Activate remote tx or rx sites

The second set is most likely paging in the two tone format.

See the following for more info:

http://www.wpascanner.com/wiki/index...dwaTone_Out


http://www.wpascanner.com/wiki/index.php?title=Tones


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