[RFI] 40m (and other) noise

Ash Thornton thorntonash at comcast.net
Fri Apr 10 11:47:23 PDT 2009

I have had similar problems for the past several years.

One noise is very broad, 80M through 40M, a S3-5 with a 500Hz   
filter. It is usually from the south and comes and goes on a schedule  
which makes me think it could be a TV. I have not been able to pin it  
down with an IC-R20 walking around the area. On occasion I get it  
from different directions, again could be a TV? I am in the process  
of building a small loop and if that does not help the IC-R20 I'll  
walk around with a K3 and battery, Hi.

I also hear a similar signal, stronger and it appears to roll down  
the band following the S meter peak signal.

I usuall use 80 or 40 4-Squares, but also a problem with a  
dipole,maybe not quite as bad.

The first signal plays havoc with weak CW signals, but taking out the  
preamp helps, but otherwise no way to combat it.

Sometimes it sounds like a carrier in AM, other times it is a buzzing  

I'll post anything I can determine.


On Apr 10, 2009, at 7:12 AM, Sam Morgan wrote:

> I have recently started hearing a noise 24/7 on 40m.
> The noise is heard about every 11khz and randomly moves up or down  
> a khz or so.
> Best I can tell it covers from about 6.910mhz to 8.040mhz
> I also hear it on 1.923mhz or so but only that one frequency on the  
> whole 160m band.
> I just checked the 30m band and I hear it every 40khz on it.
> Can any one identify what it's coming from?
> It may show up other places,
> I just ran into the 40m ones the last few days
> and then tonight found the 30m and 160m one.
> I have shut down my apartment at the breaker panel,
> and the noise is still there. I have had new neighbors move in an  
> adjoining
> apartment. Above and one apartment over, right below some of my  
> antennas on the
> roof.
> Here you will see and hear the noise on 40m:
> http://pages.suddenlink.net/ka5oai-1/#40m-noise
> -- 
> GB & 73
> Sam Morgan
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