It sure sounds like external power utility noise to me! Do you have a
portable am radio in your car? Is the noise louder with an internal
antenna? Do you know anyone with a portable am radio?
> ----------
> From: kboswell@aetn.org[SMTP:kboswell@aetn.org]
> Sent: Wednesday, August 26, 1998 7:35 PM
> To: rfi@contesting.com
> Subject: [RFI] Electrical noise
>
>
>
> I've recently noticed receiving a strong electrical interference on my HF
> station. It sounds like a constant buzz, S9 or stronger from 500KHz up to
> at
> least 6MHz. The signal peaks around the lower end of 80m. From there it
> tapers
> off disappearing around 5.077MHz, then begins rising again. It may go
> higher.
> I've just begun to trace this thing.
>
> I've tried turning off each circuit breaker, one at a time, to see if I
> could
> isolate the problem to any portion of my apartment. No luck. I thought
> perhaps the air conditioning unit next door was about to die. (It has been
> getting loud lately). But the noise continues regardless of the air
> conditioner. The noise blanker removes it completely! (Rig is Icom 737.
> Wonder type of noise the blanker was optimized for?)
>
> Suggestions? Techniques? Sorry, don't have the portable AM radio to
> use for
> the old faithful foxhunt technique.
>
>
> While typing this message I've again checked the signal. At 3700 it is
> 20db
> over S9.! At 29.9MHz is still S9!
>
> TNX de Kelly,
> KA5MGL
>
>
>
>
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>
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