Discussion
What does an increase in antenna current with modulation indicate?
Answer: B
Total power rises as \( 1 + \mu^{2}/2 \), so the antenna current rising when modulation is applied is exactly what a healthy AM transmitter does, and the increase measures the modulation index. It is not a fault, and it does not by itself indicate over-modulation, which needs the envelope to be examined. Loss of the carrier would reduce the current sharply. Knowing which meter movements are normal is as important as knowing which are not.
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