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Communication Systems

Q1:

A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is

A 21 kHz

B 22 kHz

C 42 kHz

D 44 kHz

ANS:D - 44 kHz

Frequency deviation = 10 kHz, fm = 1 kHz  2(fm + Df) Bandwidth = 22 kHz  2(10 + 1)  22 kHz fm is doubled Hence 22 x 2  44 kHz bandwidth.



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