Amateur Extra › E8 Signals and Emissions › E8B03
E8B03
What is the modulation index of an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency if the highest modulating frequency is 1000 Hz?
Pick an answer to check it.
Answer: A. 3
Modulation index = deviation / modulating frequency = 3000 Hz / 1000 Hz = 3.
Tip: 3000 / 1000 = 3.