I came across this question which goes
An FM signal with modulation index mf is passed through a frequency tripler. What will be the modulation index at the output of the tripler?
and according to the reference book the answer is 3mf.
Modulation index as we know is the ratio between the frequency deviation and the maximum modulating frequency, both of which are multiplied by the same factor when the signal is fed to say a class C amplifier. So I suppose the modulation index will not be affected by any frequency multiplication since the factors would just cancel each other out. Am I correct or is there something I'm missing out on?