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| To: | [email protected] |
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| 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 > 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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