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Good stuff. It's the biggest difference between the eye and the bar. Question pool questions. What is the modulation index of an FM phone signal frequency deviation of 3,000 hertz either side of the carrier frequency? It's the highest frequency, it's the highest modulating frequency is 1,000 hertz. Let me read that again because I stumbled all over it. What is the modulation index of an FM phone signal Having a maximum frequency deviation of 3,000 hertz either side of the carrier frequency is the highest modulating frequency is 1,000 hertz.