In article , Chuck Harris
writes:

As to why cheapy FM radios respond to this kind of AM noise, it is all
in the use of a ratio detector vs a limiter/discriminator. Ratio
detectors are pretty good at eliminating AM, but limiter/discriminator
stages are very good at eliminating AM. Ratio detectors are basically
simpler, and as such much cheaper.

Right, and I am amazed that the top-of-line Heathkit AR-15 FM receiver used a
ratio detector. Supposedly they can sound just as good, but I've always
associated ratio dets with "cheap." --Mike K.

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