Some of the line-conducted emissions can radiate from the power distribution
circuits - especially with overhead service
Charlie, K4OTV
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of N1BUG
Sent: Saturday, November 09, 2013 6:29 PM
To: Rick ve3mm
Cc: topband@contesting.com
Subject: Re: Topband: Local noise source identification
I realize this won't help but I have a similar noise. Mine is about
24 kHz wide and drifts up/down considerably more than yours. The
drift seems related to outside temperature. Here's the real kicker:
it goes away every year immediately upon the coming of snow cover,
but does not return until mid-summer sometime. This has been
happening for at least five years now. I've tracked it to a group of
4 or 5 houses on the other side of a river, about 1000 feet from
(some of) my Beverages.
Sidebar: With a portable receiver I can also detect it re-radiating
from my 100 foot vertical, which is 1500 feet from the source.
Good luck, and let us know if you find it.
73,
Paul N1BUG
On 11/09/2013 05:15 PM, Rick ve3mm wrote:
> I am looking for suggestions to help identify a local noise that I am
> experiencing on topband.
>
> It's characteristics are;
> - bandwidth approximately 15 kHz
> - amplitude relatively constant
> - centre frequency seems to vary in small steps over time, no real
pattern.
> - right now the centre frequency is 1819 kHz, it moves up and down up to 7
> or 8 kHz.
> - does not seem to be present during the day. At least not this afternoon.
>
> I shut down all of the circuits in my house other than my shack and it did
> not disappear.
>
> Has anyone experienced something similar?
>
> 73
>
> Rick ve3mm
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