Doesn't sound like anything I've heard before, but here's
an old T-hunters trick to use when it's full quieting on
your sniffer receiver: switch to the third harmonic, in your
case 434.01
I had a very strong signal that was overloading my sniffer
about a mile from the source and switching to the 3rd
harmonic let me get to about 1,000 feet.
Then going to the 800mhz frequency let me get to his front
door.... at that time I had a handheld scanner that would
do that
For want it's worth, SoCal uses 146.565 as a T-hunt freq,
the harmonic frequencies that are frequently found in our
HTs are 439.695 and 879.39. One gentleman had a scanner
that would do 66-88MHz and programmed in punched in
73.2875 and did quite well with it.
At 11:10 AM 12/12/06, you wrote:
Hello All
An interfering mystery signal has suddenly appeared on the input
(144.670 mhz.) of our repeater. Using a five kc. wide FM
detector---The signal is approximately one second in
duration----opens with 100 hz. PL (which continues throughout) and
then three DTMF "zeros" follow in rapid succession and then possibly
a short period of some sort of data. The signal repeats exactly two
times an hour and the source is off in between transmissions. This
goes on continuously without interruption or apparent change. Our
area is between urban and big city and the signal is strong enough
to be heard over a wide area using only an HT.
A wave file of the mystery signal is at:
<http://www.radagast.org/~dplatt/hamradio/Signal_3.wav>http://www.radagast.org/~dplatt/hamradio/Signal_3.wav
using an FM detector with wide open squelch.
We are obviously very interested in identifing this signal and its origin----
What is it ?
Thanks--
Scott, N6NXI
