[Boatanchors] Interference

[WBob]

A spectrum as you describe, signal every 100 kHz for a very wide 
band is the harmonics of a pulse train with a 100 khz repetition 
rate and quite short pulse width as the spectrum seems to go 
forever. Look to any electronics, even refrigerators as they now 
have digital electronics. Odds are it is in your house or very nearby.

WBob


R.J. Keller wrote:

> Don't be so sure it is not coming from within, even with the antenna
> disconnected. Most modern rigs do not recieve even strong signals with
> the antenna disconected. I had a similar problem and it turned out to
> be my Sony Stereo receiver.
> Good luck.
> 73, Dick KF4NS
> St. Petersburg, FL 33714 USA
> Keep the glow!
> 
> 
> 
> Message: 8
> Date: Tue, 26 Aug 2003 17:46:01 -0700
> From: telegrapher@att.net
> Reply-To: telegrapher@att.net
> To: boatanchors@mailman.qth.net
> Subject: [Boatanchors] Interference
> 
> I'm not sure where this should be asked but i'm experiencing a noise
> on
> the whole spectrum, every 100+ kcs from 3.0 mc thru 21 mc.  That's as
> far as i've checked.  Its been there for almost a week now.  I first
> noticed it around 14.070 thru 14.095 where i mostly spend my time
> during
> the day.  This goes on 24 X 7.  It almost sounds like a small part of
> the frequency is being swept by something.  I don't really know how to
> describe it.
> 
> I chased it down to between 3.0 and 3.05 mc where its really strong.
> nothing below that  3870 thru 3890 (AM channels of course), dead on
> 7290-7293 as well and then the 20 meter band too.
> 
> What i'd like to know is if any one else could take a listen in those
> areas to see if they are hearing it as well.  I disconnected the
> antenna
> from the 990 and it goes away, of course meaning its outside.  Turned
> off all the electrical stuff in the house, popped CBreakers, tried
> different receivers and get the same results.  I'd prefer to not think
> its coming from a neighbor. As i don't hear it below 3.0 mc i don't
> have
> a portable receiver to haul around and listen for it.
> 
> Its been a constant S-5 on 20 meters and about an S-7 at 3.0/3.05
> where
> its originating.  ALthough down there its nothing like what i hear
> when
> i get up further in the spectrum.
> 
> Its perplexing and i wish i could describe it better but without some
> verification from others, i'm not sure where i will find this.  I've
> never in 45 years of hamming heard anything like this and really don't
> expect to find it locally.
> 
> Any monitoring help out there.  Even my GPR-90 and ARC-5 receivers
> don't
> like it.
> 
> Larry
> W0OGH
> 
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