Thanks for posting the spectrum, Scott. With your permission, I'd like
to add it to my collection, and probably a presentation.
When you pull the old dimmer out, please pay careful attention to how
it's wired, whether the green wire is connected, and try to get an exact
model number for it.
Also exact model number for the replacement dimmer. Is it one intended
for use with LED lighting?
73, Jim K9YC
On Fri,12/2/2016 1:38 PM, K9MA wrote:
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
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