Discussion
Why is the modulator's audio bandwidth deliberately limited in an AM broadcast transmitter?
Answer: A
Since the transmitted bandwidth is twice the highest audio frequency, limiting the audio to four or five kilohertz is what keeps the signal inside a nine or ten kilohertz channel. Audio power depends on the modulation depth rather than the bandwidth. Linearity is a circuit property. And over-modulation is prevented by a peak limiter, which is a separate stage. The audio chain's filter, limiter and level are three distinct controls serving three distinct regulatory requirements.
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