[CQ-Contest] LED Lighting RFI

[K9MA]

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.

73,

Scott K9MA

-- 
Scott  K9MA

k9ma at sdellington.us