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Re: [CQ-Contest] LED Lighting RFI

To: "'K9MA'" <k9ma@sdellington.us>
Subject: Re: [CQ-Contest] LED Lighting RFI
From: <wigi@kl0r.com>
Date: Tue, 17 Oct 2017 20:56:16 -0800
List-post: <mailto:cq-contest@contesting.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??


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


Scott K9MA

Scott  K9MA


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