Re: [RFI] Anyone know what this might be

["WX5L" <wx5l@charter.net>]

Noise like this can be from so many different consumer devices. It's just 
incredable how much  RFI is out there with new technology. I would think a 
S-9 would be within a block or 2. Did you go out at least 2 city blocks 
away?

Here's a reference web-page that was  helpful to me recently. 
Http://www.ve3hls.com/noise/rfihome.html

> From your recording it's not typical power line noise but from a device like 
a thermostate, cell phone wall charger, electric blanket or ionic air 
filter. Give a close listen to the .wav file sent in by N4EKV. It sounds 
similar but has a different timing but that could be just different 
manufacturers. Take a listen to some of the others not related to typical 
line noise.

73,
Randy
WX5L


----- Original Message ----- 
From: "Kelly Johnson" <n6kj.kelly@gmail.com>
To: <rfi@contesting.com>
Sent: Sunday, January 23, 2005 1:03 AM
Subject: Re: [RFI] Anyone know what this might be


> I DF'd the noise tonight then went out scouring the neighborhood with
> my FT-817 and a whip.  I couldn't find the source.  It's S9 in a 6KHz
> bandwidth in AM with my 3 element yagi aimed at the source so it's
> fairly strong, but not strong enough to hear on my whip.
>
> I recorded the noise as .wav file and put it on my website.  At first
> I thought it sounded like white noise, but now I realize that it
> sounds more like a motor starting up or something.  The noise lasts
> about 1 second and repeats every 24 seconds. I'd love to have people
> listen to it and help me identify the source.
>
> You can find the file on my website at:
> www.kellyandshari.com/n6kj.html
>
> Click on the RFI-1 link near the bottom of the page.
>
>
>
> On Sat, 22 Jan 2005 19:21:07 -0600, WX5L <wx5l@charter.net> wrote:
> > First you need to get a direction of the noise. I would hope you have a
> > rotatable HF beam. Carefully rotate and determine the direction of 
> > strongest
> > level. Only then can you set out with your portable receiver. It seems 
> > that
> > the source maybe further out than you think. You will need to set out on
> > foot in this direction with your portable set on one of the frequencies 
> > with
> > the noise. Clip a wire from your HF antenna to the portable so you can 
> > tune
> > to a frequecy with a peak so that you can set out on foot with the 
> > portables
> > receiver set.
> >
> > Randy
> > WX5L
> >
> >
> > ----- Original Message -----
> > From: "Kelly Johnson" <n6kj.kelly@gmail.com>
> > To: <rfi@contesting.com>
> > Sent: Saturday, January 22, 2005 1:26 PM
> > Subject: [RFI] Anyone know what this might be
> >
> > > I've been noticing an RFI source lately.  It sounds like a short 1
> > > second blast of "white noise" which occurs at 25 or 30 second
> > > intervals.  It appears to be there 24/7.  I hear it on 40 through 17
> > > meters.  It peaks at about S7 or S8 in a 2.4KHz bandwidth.  That's
> > > pretty strong considering that my noise level at nigh in a 2.4KHz
> > > bandwidth is only about S1 or S2.  It's not strong enough for my
> > > portable receiver to pick up so I've had trouble DFing it.  I have yet
> > > to try to DF it with my HF yagi.
> > >
> > > Anyone have an idea what this may be?
> > > _______________________________________________
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> > > RFI@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/rfi
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