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To: rsgb_lf_group@blacksheep.org
Subject: RE: LF: New interference source?
From: "john sexton" <computernetworks@excite.com>
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Nothing here Alan but will listen out for it.
<br />
Can't imagine what it could be.
<br />
John, G4CNN
<br />

<br />
--- On Wed 03/06, Alan Melia <Alan.Melia@btinternet.com> wrote:
<br />
> Hi all, I have a new 'sound' appearing on the band recently. It is quite
<br />
> distinct from the TV PSU noises. It seems to appear at the top end of the
<br />
> band for periods of time (I am not sure whether it goes off, or just
<br />
> drifts
<br />
> away) The main symptom is a growling (I am using LSB so this is the low
<br />
> audio frequencies) which is keyed for one second with 0.5 per second PRF.
<br />
> The spectrum on Argo is of a band of 50Hz sidebands which may be FSKed
<br />
> with
<br />
> a 0.5 Hz square wave, the shift must be in excess of 500Hz . I can't
<br />
> think
<br />
> of any domestic item that would be that precise "once every 2
<br />
> secs"
<br />
> action.....the defrosting periods of a microwave oven are usually longer
<br />
> than that. (If it was that, then I have a neighbour who is defrosting
<br />
> either
<br />
> a Wooly Mamoth or a Dinosaur !!)
<br />
> 
<br />
> Cheers de Alan G3NYK
<br />
> alan.melia@btinternet.com
<br />
> 
<br />
> 
<br />
> 
<br />
> 
<br />
<br />
<hr>