Discussion
What does a signal strength meter in a receiver actually measure?
Answer: B
It reads the gain control voltage, which is proportional to carrier strength, and that is why an FM set with no gain control needs a different arrangement entirely. Audio power varies with modulation rather than carrier. Stage current is affected by the gain control but is not what is metered. And injection level is fixed. An instrument on a panel is always measuring some internal quantity that correlates with what it claims to show, and knowing which explains its quirks.
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