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Re: [RFI] Another Plea For Help

To: RFI List <RFI@Contesting.com>
Subject: Re: [RFI] Another Plea For Help
From: dalej <dj2001x@comcast.net>
Date: Mon, 8 Mar 2010 05:02:52 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
My guess, and only a guess is that HV transmission line a mile and a  
half away.  Is it a 230 KV line, real tall tower structures?  If you  
have a portable SW rx you could take a nice healthy walk in its  
direction and see if the noise gets worse.  I don't think its caused  
by the sun, because I don't have that particular noise here and the  
sun affects us all at about the same time.  The reason it sounds like  
a HV transmission line is because as the morning progresses and  
electrical demand increases the line is generating more noise, it's  
like a corona noise you hear on a mobile antenna sometimes, a frying  
or hiss.  It's probably worse in dry weather and you have a lot of  
that in Nevada.  You might try a JPS noise canx device, or the MFJ  
version, MFJ-1025 or 1026, but you will need a noise sense antenna for  
the device to pick up the noise in order to canx it out before the  

gud luke Joe

Dale, k9vuj

On 08, Mar 2010, at 0:17, Joe wrote:

> I posted this problem last month..I didn't really get much help so I  
> will
> pose the question/problem again, in the hopes someone can suggest an  
> avenue
> of discovery.  I am getting more and more frustrated.
> Joe Wolfe
> Reno, Nevada
> ****************************************
> About a month ago, my noise floor on 40 and 75m , ie:...white  
> noise....rose
> to
> 9 and 10 over.  In the early AM, the noise floor is where it normally
> is...1 - 3 s
> units.  Then, around 9 or 10, give or take, the noise floor  
> gradually climbs
> back up over 9.  Temperature does not appear to be the culprit.   
> Feed line
> (RG-8X) tests good and no water present.  Balun was replaced..no  
> change in
> noise characteristic.  (Antenna is a BuxComm 6-80 Windom at 30 feet.)
> I connected the radio (Kenwood T-2000X) to a battery, and turned off  
> the
> master switch so no power was coming into my house..  No change in  
> noise
> level.  There are no overhead wires in my neighborhood and the  
> closest major
> overhead power line is a mile and a half away.
> The frustrating thing is that it is pure white noise..no electrical  
> type of
> noise...buzzing, chirping, whistling, crackling, etc., just what you  
> hear
> for a noise floor.
> Any thoughts?  What instrument would be needed to have something  
> like this
> down?  The AM radio trick sure doesn't work...no overhead  
> transformers to
> knock about.  Mercury vapor street lights are off when the noise level
> starts to climb in the late morning.
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