[RFI] Can you identify this interference?

Pete Smith n4zr at contesting.com
Thu Jan 22 08:47:58 EST 2004

At 07:57 AM 1/22/04 -0500, Alex wrote:
>Hi there,
>Since a few weeks I've been plagued with this pulsating type
>interference. I can receive the it from 12 MHz up to into the high VHF
>range. So far I've found one very wide peak around 19-20 MHz (S9). I can
>even see it on TV channel two (antenna, no cable) where it appears as 4
>or 5 squiggly lines. Here's a sound sample:
>And the image of the recording made by Audacity can be found at:
>The recording is made with the receiver on 28.4 MHz USB.
>Any suggestions are greatly appreciated.

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?  A clean electric fence should not 
interfere, but often weeds grow into a fence, or insulation breaks down, or 
the box is not properly grounded.  In all of these cases you get small 
arcs, and voila!

73, Pete N4ZR
Check out the World HF Contest Station Database
Updated 9 Jan 04

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