[RFI] Finding house noise sources

Gary Smith Gary at ka1j.com
Tue Jan 19 09:42:25 EST 2016


Not on that circuit but there is a dimmer in the living room. I am 
going to need to check that out. I know dimmers are known to be a 
trouble source. I will put that on my list of things to check out.

I'm going to replace the light socket and flip switches in the known 
bad circuit and be sure all the electric connections are good and 
spray deoxit on the connections before tightening.



> Do you by chance have any lamp dimmers on that ckt?  Dimable ceiling
> lights for the kitchen maybe?
> -- 
> Thanks and 73's,
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> On Mon, 2016-01-18 at 16:52 -0500, Gary Smith wrote:
> > Hi,
> > 
> > I need some ideas on how to track down some noise sources inside the 
> > house. I thought it would be just switching off breakers and then 
> > unplugging the electronics on that circuit till I find the one that 
> > has failed and deal with that. No, there's more to it that I just 
> > discovered.
> > 
> > For some time I have been having noise on my HI-Z Triangular. It is 
> > NW of the house. A salt marsh sans anything electric from the S to 
> > almost N to the West of me. The least noise was N, toward AMTRAK 100' 
> > away and when I would turn the aiming direction clockwise, I would 
> > get more RFI until the maximum between the south and the NW. Also, My 
> > be3am located at the center of the roof identified much the same. I 
> > quit using the beam because the noise was too much. For the most 
> > part, the noise seemed to come from the direction of neighbors who 
> > are only to the SE & S of me.
> > 
> > I asked my YL to watch my monitor, connected to the P3, as I flipped 
> > off breakers. On the 2nd flip she said the noise was gone. The only 
> > outlets I could find at fault are the overhead light in the hallway 
> > and one bank of wall plugs in the kitchen. Nothing in the kitchen 
> > when unplugged stops the interference. Somehow, something unknown 
> > that is attached to the circuit is causing this problem and I have to 
> > track that down.
> > 
> > The attic was filled with that paper mache kind of blown insulation 
> > and all of the wires are covered. That will make finding and tracking 
> > the wire to the overhead light difficult, I have no markers to where 
> > to safely step. I can do it bit by bit of course but I just can't 
> > look and follow the wires. In the basement, there is a false ceiling 
> > that holds the wires and some of them are in an area very difficult 
> > to access.
> > 
> > But the problem remains that when that one circuit is eliminated, 
> > most if not all the noise goes away and I find nothing attached in 
> > line except that one overhead light and it was not on when we did the 
> > test.
> > 
> > It was brought to my attention that a defective doorbell transformer 
> > can cause major issues but the doorbell is not on the same circuit 
> > and though I looked for that transformer, it's not in the closet or 
> > anywhere else I can find. The electrician was a gem. Still, I'd like 
> > to check it out, it's had power on it since 1969.
> > 
> > So how might I best localize a source of internal house RFI when 
> > nothing is plugged in? Is there something like a stud finder that 
> > will allow me to follow the path of wiring behind walls?
> > 
> > Thanks & 73,
> > 
> > Gary
> > KA1J
> > 
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