It sounds to me like a defective mercury vapor streetlight
(those purplish-colored ones) trying to ignite. Look around
and see if there is one in the neighborhood that is not lit
at night, and see if it generates your noise when it
repeatedly tries to ignite. I once found a bad one in a
county maintenance yard about 1/2 mile away.
Dave Hachadorian, K6LL
Yuma, AZ
----- Original Message -----
From: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
To: <rfi@contesting.com>
Sent: Thursday, November 30, 2006 2:46 AM
Subject: [RFI] Identification help
>I have a strange source of very strong interference,
>especially on
> 80m, but I've heard it at least on 40m and 17m as well. I
> haven't
> quite figured out the pattern in frequency where it's
> worst, but bad
> spots are 3512 and 3795 kHz and around there, and it's
> pretty
> irritating. It's strong enough to cover up s9 signals.
>
> It sounds like a burst of white noise lasting a few
> seconds but starts
> and ends with a little warble.
>
> I have some recordings:
>
> AM mode, AGC off, wide filter, 3795 during the day:
> http://www.n3ox.net/files/80m_rfi.mp3
>
> LSB mode, AGC off, 2.4kHz filter, 3595 at night, you can
> hear the
> warble better in this one:
> http://www.n3ox.net/files/80m_LSB_1.mp3
>
> And I have a spectrum capture of one of the events,
> somewhere on 80m, LSB:
> http://www.n3ox.net/files/80m_RFI_1105.jpg
>
> Anyone know what this one is?
>
> 73,
> Dan
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> RFI@contesting.com
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