[RFI] 40m (and other) noise

Fri Apr 10 07:06:13 PDT 2009

I assume when you say 'noise' that it isn't a single carrier, but a wider
noise.  If that is so then I would say it sounds like a computer monitor or
tv.  But could be a broadband powerline communications signal also.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net

> -----Original Message-----
> From: Sam Morgan [mailto:ka5oai at gmail.com]
> Sent: Friday, April 10, 2009 11:12
> To: rfi at contesting.com
> Subject: [RFI] 40m (and other) noise
> 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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