[CW] Strange interference

[David J. Ring, Jr.]

Leaking color burst oscillator from a near by TV set.

73

DR
----- Original Message ----- 
From: "Donald Chester" <k4kyv at hotmail.com>
To: <cw at mailman.qth.net>
Sent: Saturday, January 01, 2005 12:44 AM
Subject: [CW] Strange interference


> This interference covers the entire HF spectrum - from 80m to 30 mHz, 24/7 
> for the  last couple of months.  It is spaced intervals of approximately 
> 30.475 kHz.  On an AM detector it sounds like a tone modulated carrier, 
> but careful observation shows that there are two distinct carriers 
> heterodyning against each other; one is unmodulated and the other has a 
> spastic but barely perceptible frequency shift of a few Hz, and each shift 
> initiates with a click. The frequency shift averages about twice a second.
>
> The higher in frequency, the greater the spacing of the carriers.  At 30 
> mHz, they are a little over 800~ apart, on 20m. they are a little over 
> 400~ apart, on 40 they are 200+ hz apart, and on 80m about 100~ apart. 
> Although the signals appear approximately every 30.475 kHz, some 
> frequencies are much stronger than adjacent ones.  There are a few holes 
> in the pattern, where nothing is audible on the expected frequency.
>
> The signal appears to be local, since it comes in on 10m all the time, and 
> the S-meter remains stationary, thus excluding  the liklihood that it is 
> skywave.  The higher in frequency, the stronger the signal.  It is louder 
> than my xtal calibrator on 10m, but on 80m it is almost buried in the 
> noise.
>
> Here are a few of the frequencies I measured that  fall inside the ham 
> bands:
>
> 29.998826/29.999660 mHz
>
> 14.884912/14.885340 mHz
>
> 7.373734/7.373935 mHz
>
> 3.618225 kHz
>
> The signal is extremely stable; I notice no drift over a 24-hour period.
>
> It is not something in the house, since I cut the a.c. power at the main 
> utility entrance and the signal is still there.
> javascript:PopUp('http://www.qrz.com/ib-bin/ikonboard.cgi?s=bb184a566cd996d8331f5b3e57a1cd05&act=Legends&CODE=emoticons','HelpCard','200','400','0','1','1','1')
> Emoticons
> Anyone ever heard anything like this?
>
> Don K4KYV
>
>
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