[CQ-Contest] LED Lighting RFI

[wigi at kl0r.com]

Thanks for the post, Scott... We have a pernicious noise problem from power supplies at KL7RA... from the DirectTV boxes. We can take them offline, but it would prevent ops from watching "The Young and The Restless" reruns on the Soaps channel. I am curious if there are any suggestions for quiet switching supplies for the random home electronics??

Wigi


-----Original Message-----
From: CQ-Contest [mailto:cq-contest-bounces at contesting.com] On Behalf Of K9MA
Sent: Friday, October 13, 2017 11:38 AM
To: CQ Contest <cq-contest at contesting.com>
Subject: [CQ-Contest] LED Lighting RFI

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

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