You may want to look at this site that ve3hls has:
<quote>
The RF Noise Identification Website (http://www.ve3hls.com) was updated
tonight with
the addition of 14 new noise files in MP3 format.
<unquote>
search for the one that I have on there from 75m and see if that's what it
sounds like. Still don't know what it is though... just a note, the first
sentence is wrong, I just sent him a note about it... I don't hear it on
20/17/15 only around 75/80m.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
> Behalf Of Brad Pioveson W9FX
> Sent: Wednesday, January 26, 2005 22:26
> To: RFI@contesting.com
> Subject: [RFI] Pulsing RFI?
>
> Hi, all. After several years of having little interest in the 80M band,
> today, I strung up an antenna and, was greeted by an odd signal that has
> been apparent at 80 kHz intervals across the band continously today. The
> peak of the sig appears to be at 3.775 MHz and, they extend well past 4.5
> MHz at that ~ 80 kHz interval. The pulses are approximately 1/2 second in
> duration and are almost, but, not quite, sync'ed with the second hand of
> the
> clock. Occasionally, one pulse will almost be twice as long as the others
> -
> usually, this happens about once per minute and at random intervals. I've
> eliminated possible sources in my QTH - including what I perceived to have
> been the logical sources: digital alarm and VCR clocks, PC's, DSL modems,
> and the like.
>
> This is a new one to me. Before I drag out the sniffing gear and cobble
> together a rudimentary DF antenna for 3.5 MHz, does anybody have a clue as
> to what I might be hearing? Does/can digital CATV, which has been
> installed
> in the neighborhood since my last foray on to this band, ring any bells?
>
> 73, Brad, W9FX
>
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