I just bought a 70's vintage nice quality transistor AM radio at at thrift
store, and have been taking it around my house to listen for noise.
Surprisingly, the LED bulbs I have in all my lighting fixtures have been quiet.
My DirecTV box is VERY noisy, as is my Accurite weather station. My 2009
vintage Samsung LED TV also emits a lot of hash, but can only be heard when I
put the radio right up to the television. Fortunately for me, my shack is in my
metal shop, (on a separate power feed), but of course, my antennas are not. Now
that I have this "tool" I am going to take a hard look a every piece of
electronic stuff I own and evaluate the noise levels.
73;
Mike
W7VO
----- Original Message -----
From: wigi@kl0r.com
To: "K9MA" <k9ma@sdellington.us>
Cc: cq-contest@contesting.com
Sent: Tuesday, October 17, 2017 9:56:16 PM
Subject: Re: [CQ-Contest] LED Lighting RFI
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@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.
73,
Scott K9MA
--
Scott K9MA
k9ma@sdellington.us
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|