[RFI] RF into home alarm system

Jim Brown jim at audiosystemsgroup.com
Sun Oct 18 23:14:04 EDT 2015

On Sun,10/18/2015 6:46 PM, Tim Duffy wrote:
> that wired system is a huge antenna.

Yes, AND alarm systems are notoriously BAD about rejecting RFI.  I agree 
with Tim -- go wireless if it's an option.

On Sun,10/18/2015 6:35 PM, W5JR Mike wrote:
> Last eve, wanting to play a bit in the Pre-Stew on 160m, but as yet not having my 160 antenna repaired, I was able to get the tuner to find a match on the 80m OCF. Even with just 100w, folks were answering my CQ's. I'm sure there was lots of stray RF floating around.

OCF antennas are notorious for putting common mode current on the 
feedline, which in turn puts that current on wiring inside your home. In 
effect, home wiring becomes part of the antenna.  It is a recipe for RFI.

73, Jim K9YC

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