Discussion
What is the defining feature of a superheterodyne receiver?
Answer: A
The architecture's whole point is that whatever the station's frequency, it is translated to a single fixed intermediate frequency where all the gain and selectivity live. Amplifying at the signal frequency is the tuned radio frequency receiver the superhet replaced, precisely because its filters had to be retuned and its bandwidth changed across the band. Two detectors in succession describes nothing in this chain. And an oscillator on the signal frequency would produce zero difference, which is the direct conversion receiver rather than a superhet. Fixing the frequency at which the hard work is done is the single idea from which every other property of the architecture follows.
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