Discussion
Match each parameter with the scheme whose index it defines.
List I
A. Peak phase deviation in radians
B. Deviation over message frequency
C. Message over carrier amplitude
List II
P. Amplitude modulation
Q. Frequency modulation
R. Phase modulation
Select the correct match.
Answer: B
Radians of phase define the PM index, deviation over message frequency the FM index, and the amplitude ratio the AM index, so A-R, B-Q, C-P. Laying the three definitions side by side is the fastest way to avoid mixing them, and it shows why only the FM index carries a frequency dependence. The alternatives each swap two of the three, which is precisely the error the mapping exists to prevent.
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