Last winter, I tracked down some bad RFI to a neighbor's LED lighting
system. Replacing the power supply completely eliminated the
interference. I just bought a similar one for my own home and tested it
for RFI, finding none at all from 160 through 20 meters. Antennas were
less than 25 meters from the power supply and lights. I have plenty of
other noise in this urban location, so there might be noticeable RFI in
a quieter location, but this power supply is certainly a lot quieter
than many of the others in the neighborhood.
I can recommend the Armacost power supplies manufactured by MOX
Lighting, models MD24W12VA and MD45W12VA. The 60 W version from LTF
Technologies was the bad one, but Armacost told me they were dropping
that vendor, and the MD60W12VA Armacost sells now appears to be made by
MOX, though I haven't tested it. By all means, stay away from anything
manufactured by LTF Technologies.
It appears it really IS possible to build low-cost switching supplies
that don't generate enormous amounts of RFI.
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