Hi John,
Interesting that you should bring this up......I have a similar
problem........It affects only 6, 10 and perhaps 15 meters (I know I dont
have a problem on 20).............I have traced the problem to a stretch of
high voltage tension wires that run along the street on the bottom edge of
my property.....I wrote a formal complaint to the local utility (PP&L) and
they have acknowledged my complaint but I have yet to hear if they are
making progress. The pattern of the noise is quite intermittent at times and
does vary in intensity. I was planning on setting up a dedicated receiver
tuned to 10 meters and setup a data logging program that would record
intensity of the noise, temp, humidity and run that for about 3 weeks. At
first guess it appears that the noise varies in accordance to electrical
demand in the area (ie Cold days...lots of noise...Heaters on....comfortable
days not so noisy) but that is a guess.
Anyway, I recorded my DF investigation and resultant s meter readings of the
noise on video tape and I sent a copy to the utility along with my
letter......It did get their attention.
Stephanie WX3K
http://www.wxpage.com
----- Original Message -----
From: "John Pelham" <john@radiophile.com>
To: <rfi@contesting.com>
Sent: Monday, April 30, 2001 2:02 PM
Subject: [RFI] A description of my RFI problem - help solicited
>
> I've got a noise problem, and although I perhaps haven't done enough
legwork
> yet to be writing responsibly to this reflector, I thought I'd give a shot
> with a description to see if anyone's run across this type of thing.
> (Anyway, this reflector sure has been quiet lately.)
>
> Actually there are (at least) two noise sources. But they have similar
> characteristics. They sound, on AM, just like an electrical arc.
Buzzing,
> with an ac-hum component plus higher harmonics. With a product detector,
> they sound more like higher pitched buzzing or hissing.
>
> One of the noises affects primarily 6M, but is audible on 10 and 15. The
> other affects primarily 10M and 15M. The noises come and go
independently,
> but are most often present on dry days. They were a real problem during
the
> dry winter, and are present less often now that the summer humidity has
> kicked in here in Georgia. They are never present when it's raining,
> although they can be present (very seldom) when it's drizzling. They are
> never present late at night, dry or wet, but they can be present in early
> evening when it hasn't been dark for too long.
>
> Also, the noises seem to be more prevalent when the band conditions are
> good, but that's gotta be my imagination!
>
> I would think that the above paragraph would indicate that the source is
> outside, and I would think probably it's power line noise, but my reading
> indicates that power line noise gets stronger at lower frequencies. These
> noises are not audible below 20M.
>
> Does anyone have any ideas? I've done some limited investigating, but I
> thought I'd keep this first e-mail short. I'd be glad to go into more
> detail about my noise problem; just ask me!
>
> 73, John W1JA
> Suwanee, GA
>
> John Pelham
> E-mail john@radiophile.com
> Antique radio Web site http://www.radiophile.com
>
>
>
>
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>
>
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