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Which risk notably increases when an AM radio transmitter's modulation index nears one?

A)Carrier wave signal cancellation occurs
B)Excessive signal bandwidth is produced
C)Antenna impedance drifts significantly higher
D)Harmonic distortion rapidly decreases gain

💡 Explanation

Excessive signal bandwidth increases as the modulation index nears one because amplitude modulation's sidebands broaden, increasing occupancy. Therefore bandwidth increases, rather than antenna impedance drift because of the changing characteristics of an EM wave.

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