Here's what the spectum of a Lutron dimmer switch looks like:
http://sdellington.us/hr/RFI161127.jpg
There's a long tail upward in frequency for perhaps 70 kHz. Repeats
every 96 kHz, and it's quite stable. That quiet range is only 20-30
kHz, but I was somewhat lucky last weekend that one fell at the low end
of 20. The sharp cutoff made it easy to identify with a handheld
receiver. I mistook it for a switching power supply, but that's sort of
what it is, anyway. I can see many similar, but weaker, signals with
the same sort of spectrum, no doubt devices of other neighbors in my
urban neighborhood. (Some of these others are switching at different
frequencies, coming from different directions, etc.)
I bought the neighbors a replacement dimmer (Levitron), but we'll see if
that solves the problem. As others have pointed out, it could be
mis-wiring or the LED lamps themselves.
73,
Scott K9MA
--
Scott K9MA
k9ma@sdellington.us
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