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On Tue, 06 Apr 2004 04:34:00 GMT, "Dave Pitzer"
wrote: The signal fades to next to nothing and then increases to very loud but extremely distorted then will be loud and clear for a while. (During the day this station's signal is fine.) Your problem is selective fading. You are probably using an ordinary AM receiver. When the selective "notch" hits the carrier it gets very weak and the automatic volume control turns up the RF-amplification. But at the same time the sidebands are not nulled out to the same degree. So you get a loud distorted audio signal resulting from relatively strong sidebands and a very weak carrier. If you couldn get a receiver with single sideband reception or - even better - fase-locked "sync" reception you would get better sound. You would still get some distortion but it would be of a much less malignant (linear) kind. I would thnk that this is a more realistic solution than trying to null out the different signal path with some sort of sophisticated antenna. I use a Sony "sync" shortwave receiver myself for listening to eg. BBC with good result. Jeppe |
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