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Communication Systems - Engineering

Q1:

A signal m(t) = 5 cos 2p 100 t frequency modulates a carrier. The resulting FM signal is
10 cos {(2p 105 t) + 15 sin (2p 100 t)}
The approximate bandwidth of the FM would be

A 0.1 kHz

B 6 kHz

C 3.2 kHz

D 100 kHz

ANS:D - 100 kHz

Compare given equation with FM equation and you will get;

B= 15 & fm= 100.

Here B>>1 it is wideband FM signal so bandwidth = 2(B+1)fm.
BW = 3.2KHZ.