Discussion
The superheterodyne principle converts the incoming signal to
Answer: C
The mixer translates every station to a single fixed intermediate frequency, so the selectivity and gain can be provided once, by fixed filters and amplifiers, instead of being retuned across the band. That single idea is why the architecture displaced all others. Direct conversion to baseband is a different and now common design, but it is not the superheterodyne. And an intermediate frequency that varied with tuning would defeat the purpose entirely.
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