[RFI] 160 meters RFI caused by low voltage bookcase lights

Hare, Ed W1RFI w1rfi at arrl.org
Tue Sep 30 11:44:21 EDT 2014

At those levels, there is little doubt in my mind that this exceeds the FCC limits for emissions.  Let me know what model number this is and we can get one and test it.


-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Don Kirk
Sent: Monday, September 29, 2014 1:25 PM
Subject: [RFI] 160 meters RFI caused by low voltage bookcase lights

Late last week I encountered interference on 160 meters which was repeating at 41 khz intervals, and this morning I was able to track the problem down to low voltage bookcase lights at my neighbors home which is 430 feet away.  I created a website to document this case which includes a link to a youtube video that contains receive audio of the noise, and my simple website URL is http://sites.google.com/site/bookcaselightsrfi/

The signal was S9 on 160 meters (approximately 15 dB above my noise floor when using a 500 hz receive filter), and it could be heard up into the 80 meter band.

We (my neighbor and I) will now dig into his low voltage lighting system to see what we can do to eliminate the interference.

Just FYI,
Don Kirk (wd8dsb)
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