Discussion
Which single change converts a PM transmitter into an FM transmitter?
Answer: A
Integrating the message is all that is required, and it is exactly what the Armstrong chain does. Differentiating would take an FM modulator to PM, which is the opposite conversion. Raising the sensitivity increases the index without changing the scheme. And a limiter affects amplitude, which is constant in both cases. The economy of the conversion is what makes the two schemes genuinely one family rather than two unrelated techniques.
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