Adam,
If you suspect a local source for the noise, you might consider making an mp3 recording of it. There are some hams out there who have a LOT of painful experience chasing down noise sources and have become pretty good at identifying the sounds. I'm sure there are some of those experts here on the Elecraft reflector, as well as on the Contesting reflector. You could upload the mp3 file to your website and forward the links.
73,
Dave AB7E
-------- Original Message --------
Subject: Re: [Elecraft] Using K3's Pre-amp
From: "Adam Koczarski" <[email protected]>
Date: Mon, January 12, 2009 8:47 am
To: <[email protected]>
I just ran a noise experiment at my QTH yesterday. My typical noise is s7.0
S6.5 s7.5 on 80m, 40m & 20m respectively. With every circuit in the house
off, except the one the radio is on, and with only the power supply and the
radio on that one circuit the noise is s4.0 S4.75 s5.0. I turned on circuits
one at a time and recorded to S level jump for each. The 'home entertainment
center' seems to be the biggest contributor so I'll start there. Now I just
need to figure out how the switch off the neighborhood transformers and
silence my neighbors! :)
I have some fairly large power lines across the street. Are they usually
strong contributors to noise?
You can see the resulting data here:
http://www.ka7ark.com/20080111QTHnoise/pics.html
Adam - ka7ark
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