john,

These days, it could be anything, a plasma TV, for instance. But what you 
describe doesn't sound like that. Switching power supplies are known to 
shift and sweep frequencies as you describe. i had a 20 over 9 noise level 
that seem to show up from nowhere one day and was on all the time. It turned 
out that the wall wart that powered my wife's sling box was the culprit. it 
had been plugged in for years with no problem but one day it just went bad. 
It took me a week of flipping breakers and unplugging items to track it 
down. Good luck and 73.  Lou  WA3MIX
Lou Kolb
Voice-over Artist:
Radio/TV Ads, Video narrations
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www.loukolb.com
----- Original Message ----- 
From: "John Glass" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 06, 2014 1:23 AM
Subject: A Noise Problem I Am Having


> Hi,
>
> I am trying to track down an intermittent noise problem, and any 
> suggestions will be greatly appreciated.
>
> I live in a condominium, and have an upstairs neighbor.
>
> The intermittent noise covers the am broadcast band up through the 440 ham 
> band.
>
> When listening to a repeater, I can hear the noise start out at a low 
> level, then it gets very strong and will take the local repeater 
> completely out of my receiver for about five seconds.
> The noise seems to sweep in frequency.
>
> Unfortunately, it is very random, sometimes I won't hear it for several 
> hours, and at other times, It is present every few minutes.
>
> I have turned my main ac circuit breaker off with no effect, so I think 
> the source is coming from my neighbor's condo.
>
> Any ideas of what might be causing this?
>
> John