Desensing of FM band

[Brian Gaff]

Somewhere around here is a very strong carrier that has the effect on most
FM radios of making the radio less sensitive. Its switching on and off every
few seconds and has been doing so for at least a couple of years. Its most
obvious on weaker stations and worse on the low end of the band, but here is
the thing. I cannot find this carrier on my scanner, though there do appear
to be some cross modulated birdies switching on and off at the same rate.
You can tell these are overload noises as an attenuator removes them.
Its very strange and seems to be mainly very local.
Seems to me it must either be a massive signal to have such a broadband
effect, yet I cannot find it. I was wondering if it was some industrial
process, as there are a lot of small businesses about. When the whether is
warmer I'll have to take a portable fm radio around to see where its coming
from.


Brian

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