[RFI] Can you identify this interference?

Mike A. King - KM0T scsueepe at mtcnet.net
Thu Jan 22 09:41:28 EST 2004

Hi guys, I have the same thing, its been around for 3 months or so.  But
since my station was down for maintinance, I did not pay too much attention
to it.  I now realize that something is up.   It is amazing how much the
same it sounds.

I live in a residential neigborhood.  I think its coming from the house next
door or the service transformer between us.  Or perhaps a CATV pedestal that
is there too.

I have yet to cut power to the house, but driving around it seems to die off
2 or so houses away.  It is not peaking by me.

I think it might be cable modems, as our community added that service not
long ago but I need to start DFing my self.  Its very strong on 6M which is
a concren, S9 and heard on 2M, then HF is really messed up.

73 and I will keep you posted.

Mike - KM0T en13vc

----- Original Message ----- 
From: "Alex" <kr1st at amsat.org>
To: "Pete Smith" <n4zr at contesting.com>
Cc: <rfi at contesting.com>
Sent: Thursday, January 22, 2004 8:22 AM
Subject: Re: [RFI] Can you identify this interference?

> Hi Pete,
> Pete Smith wrote:
> > It looks and sounds to me like at least 2 electric fences at differing
> > signal strengths and with their "tick" interval slightly different.  Is
> > that possible, given your QTH?
> That was my first thought, too. I thought maybe someone put something up
> for their dogs. I'm not in a rural area and there are no farms nearby,
> and no one keeps animals except the usual pets. The yards in this
> neighborhood are not big enough for that. :(
> I did cut the power to the house, and checked everything that runs on
> battery power, to no avail though. I also wonder if the noise gets
> propagated though the power lines as the interference is strongest near
> the house wiring. But that may be just the house wiring acting as a
> large antenna that couples its energy into the whip of the portable
> receiver. Same thing happens when I hold the whip near the chain link
> fence of the neighbors.
> I also drove around in the neighborhood with a scanner (136 MHz, AM) and
> a portable shortwave receiver, but I can't find any hot spots. In fact,
> it disappears just a 1 or 2 houses down the road from me. I'm inclined
> to think it's something that radiates a rather weak signal and is close
> to me. Hopefully I get some time soon to do some DFing with the scanner
> and a VHF Moxon.
> Thanks for the suggestions and 73,
> --Alex KR1ST
> http://www.kr1st.com
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