Discussion
What is delayed automatic gain control?
Answer: C
The delay is in level rather than in time: the loop is biased so that it does nothing until the signal exceeds a threshold, leaving full gain available for weak stations. Slowing the response in time is a separate matter of attack and decay constants, and the similarity of the names is exactly the trap here. It is applied to the radio and intermediate frequency stages. And the detector it comes from is incidental. When a term could describe two different quantities, the definition rather than the name has to settle it.
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