Discussion
Why does an FM receiver often need no automatic gain control?
Answer: A
Because the limiter already holds the amplitude constant, the output is independent of input level over a wide range and a gain control loop would add nothing. The strip has ample gain. The detector's frequency-sensitivity is real but it is the limiter that removes the amplitude dependence. And received FM levels vary as much as any other. A stage that solves a problem incidentally can make a whole subsystem unnecessary, which is worth noticing when comparing block diagrams.
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