Jim, for whatever it may be worth, we have 8 2-bulb Kichler Xenon under
cabinet fixtures in our kitchen, which is directly below my shack. I
have never noticed any noise from these on HF. We did have them all
fail, one after another, over a period of years, apparently because the
switching power supplies went south, but Kichler replaced them without a
flicker, so they must have known there was a design issue.
Looking at Kichler's current offerings, they seem to offer both units
with built-in switching supplies and units designed to be powered from a
central 12V supply. Wouldn't it be feasible to stash one large 12V
filament transformer in the back of a cabinet and wire the lights from it?
73, Pete N4ZR
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On 7/28/2014 11:43 AM, Jim Brown wrote:
On 7/28/2014 7:30 AM, Hare, Ed W1RFI wrote:
But lighting controllers operating 58 dB over the FCC limits ARE a
major threat, and we are getting new reports every week.
I strongly agree, Ed. I first encountered this in the home that we
bought in California in 2006. It has several low voltage lighting
fixtures, all run with what the electrical supply houses call
"electronic transformers." They are unbranded and unlabeled, and they
are noisy switching power supplies.
These little boxes are, for all practical purposes, the only way to
power these devices because a real transformer is four times the size
of the electrical back box into which it must fit. If any clean
supplies exist, I sure would like to know about them.
73, Jim K9YC
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