Discussion
Which stage limits the peak deviation of a broadcast FM transmitter?
Answer: C
A deviation limiter caps the audio peaks so the occupied bandwidth stays inside the channel however loud the programme. It sits after pre-emphasis, because pre-emphasis itself raises deviation on bright material. The output tuned circuit and the antenna network handle radio frequency rather than modulation depth. And the control loop holds the centre frequency. Each regulatory requirement maps to one identifiable stage. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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