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#7
01-05-2015, 05:16 PM
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Also the IF has a limited bandwidth. If you tune an FM signal such that it varies in frequency along the slope of the IF you will actually convert the signal in the IF system from FM to AM which can then be detected by a standard AM detector stage.
They used to use that trick to make 441line AM sound pre-war TV sets work after 525lline FM sound became the standard in mid 1941.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 
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