Looks like you are making progress. If your loop is not sensitive
enough, you might try building one of mine. The big loop is sensitive
enough when tuned to give a good signal when the noise is about S-7 on
On 3/22/2014 1:45 PM, Kenneth G. Gordon wrote:
Thanks, Tom. Listening to your recording, the noise from those
grow-lights as shown on your recording is not the same as what I am
experiencing, although I HAVE heard something very similar, if not
identical, to it at intermittant intervals. I am still suspicious.
To me, "my" noise has a distinctly 60 Hz component. I watched it for
an hour or so on Spectran, and found two distinct "bands" very near
the lowest end of the trace. I wish there was a way within Spectran to
expand the lower end of the trace while ignoring the higher frequencies.
I then set up my NM-20B and started trying to DF it. This turned out
to be more difficult than I had anticipated, since with the loop in
the circuit, the noise is not strong enough in the 80 meter ham band
to give me a reliable indication.
However, when I tuned down around 300 kHz or so, it turned out to be
quite strong, and from my back yard, I got a single, very clear, "DF"
on it which is about 145 degrees true from my location.
We marked it on our map, which is centered on our address.
As soon as my wife returns with the family van, my oldest son and I
will drive around trying to get a few more "angles".
Thank you very much for the link to your very informative website too.
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