My RFI battle continues unabated. While I've quieted most of the sources
in the house (I still have to figure out how to tame the HVAC system),
external noises sources continue to accumulate. There are days, when
the powerline buzz sets my baseline noise level at -80dBm, that I
fantasize about buying ten acres in eastern Oregon, putting up a tower
and running a remote station full time...
That said, I have a small victory to share. I had a noise source that I
could hear from 10 to 150 MHz. It pulsed and clearly seemed related to
something turning on and off. Last weekend, while I was out hunting
another source, I figured out that it was the traffic signal on the
corner (we will ignore the fact that this took me a year to realize.).
I called the city traffic department, which responded, within a couple
of days. I talked to a city electrician who told me that several of the
lights were LEDs with built-in power supplies.
He came by yesterday. Fifteen minutes of working with him convinced him
that the LEDs were the source. This morning he pulled the LED units and
installed incandescent lights. As soon as I confirmed that the change
solved the problem, he asked if I would help them find a filtering
solution because, at some point, the LEDs will be back. Of course I
said yes.
So that's a pretty good outcome, and fairly quick, too.
73 de Bill K7WXW
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brevity is beautiful.
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