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Re: [RFI] Ambient Noise Levels

To: "Jim Brown" <jim@audiosystemsgroup.com>, <rfi@contesting.com>
Subject: Re: [RFI] Ambient Noise Levels
From: "Jim P" <jvpoll@dallas.net>
Date: Wed, 9 Aug 2006 21:58:25 -0500
List-post: <mailto:rfi@contesting.com>

Are you saying that you hear power-line (and other 
non-intentionally generated, incidental) 'noise' (like
blenders, brush-type drill motors and the like) originating 
from far away, e.g. hundreds of miles, and the signals 
will 'propagate' having been created in large numbers 
from populated areas into signal strengths at distance 
that are then heard as wideband continuous noise 
sources when band conditions are favorable? - 

- or just more signals that are intentionally man-made 
(e.g.foreign broadcasters or overseas ham ops) and thus 
appears as wide-band nearly continuous white noise
'spectra' (white noise - a kind of rushing noise as like
strong winds or an unsquelched FM receiver might 

I don't know that the heart of the question has truely been 
answered yet as I have questions as to what is actually 
and specifically being cited here as the 'source' here of 
the noise. I contend that the bulk of noise for S4 level 
noise is man-made from electical and electronic devices
nearby (on the order of  3 or 4 residences in any given 
direction. I've had sources on 20 M half a block away on
the same distribution circuit that had noticable impact 
on the PSK31 20 M subband.)

 Jim P

----- Original Message ----- 
From: "Jim Brown" <jim@audiosystemsgroup.com>
To: <rfi@contesting.com>
Sent: Wednesday, August 09, 2006 12:45 AM
Subject: Re: [RFI] Ambient Noise Levels

> On Tue, 8 Aug 2006 14:20:50 -0700, Kelly Johnson wrote:
> >Anyone else have a theory?
> I agree with Tom -- it's noise from far away, propagated just like 
> any other RF signal. When 6M is open, for example, I hear birdies 
> that I don't hear when it isn't. And during a major blackout not 
> long ago, it was noted that the bands got real quiet at skip 
> distance from the blackout, even though they were open. 
> Jim K9YC
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