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RE: LF: New interference source?

To: [email protected]
Subject: RE: LF: New interference source?
From: "john sexton" <[email protected]>
Date: Wed, 6 Mar 2002 13:48:13 -0500 (EST)
Reply-to: [email protected]
Sender: <[email protected]>
Nothing here Alan but will listen out for it.
Can't imagine what it could be.
John, G4CNN

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

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