Discussion
Why is the detector's direct-current output useful?
Answer: A
The rectified carrier gives a direct voltage proportional to received strength, which is exactly the signal the automatic gain control loop needs, and it also drives a tuning meter where one is fitted. The audio is the alternating component, separated by a coupling capacitor. The oscillator's bias is independent. And the intermediate frequency is fixed by the filters. One detector output thus serves two purposes, which is why it is split rather than simply coupled onward.
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