Discussion
What does the mixer in a superheterodyne receiver do?
Answer: C
The mixer combines the incoming signal with the local oscillator and produces the difference, so every station arrives at one fixed intermediate frequency where the gain and selectivity can be provided once. Amplification at the signal frequency is the preselector's small contribution. Audio recovery is the detector's job. And sideband selection belongs to single sideband receivers. The translation is the single idea that made the architecture universal.
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