Communication Systems - Engineering

Q1:

If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if fm = 500 Hz, Δf = 2.25

A 6 kHz

B 12 kHz

C 27 kHz

D 54 kHz

ANS:C - 27 kHz

Δf = β x fm  4.5 x 6 kHz  27 kHz.