Discussion
How does double conversion resolve that conflict?
Answer: C
Double conversion takes both benefits in turn: a high first intermediate frequency for image rejection, followed by a low second one where sharp adjacent channel filtering is practical. The two mixers need different oscillators, the second usually crystal controlled. Two filters at one frequency would improve selectivity but do nothing for the image. And a second detector is not involved. Taking a conflict in stages, rather than compromising once, is a recurring move in receiver design.
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