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by ajosh
3084 days ago
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Aircraft bands use AM rather than FM because of the FM capture effect. When there is a double transmission with FM, the receiver will lock on to one signal and exclude the other. With AM, you will hear both as well as, possibly, a heterodyne tone if the carriers aren't exactly the same frequency which is much preferable. FM demodulators can't really demodulate AM signals. AM demodulation can demodulate FM by tuning a bit off the carrier frequency thanks to the fall-off of the filters but the quality isn't great. |
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By "isn't great" you mean, "I might be able to understand something with a tailwind, downhill" - right? :-P
The mode of operation for an AM radio listening to FM is akin to a slope detector.