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Old 3rd Aug 2021, 4:00 pm   #2
Join Date: Jan 2016
Location: Stafford, Staffs. UK.
Posts: 1,842
Default Re: FM tuned circuits, ratio detection etc

Although you are tuning to 'a frequency' you are tuning the centre frequency, plus a bit either side. A 'perfect' tuned circuit wouldn't have this, but then there is no such thing as a 'perfect' tuned circuit. So enough of the frequencies either side of the centre frequency get through to see the deviation either side of the centre frequency, and demodulate it. The amount 'either side' of the centre frequncy is the bandwidth. For voice transmaission we tend to keep the bandwidth quite narrow (narrowband FM) but broadcast tends to allow a wider bandwidth (wideband FM).
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