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Communication Systems

Q1:

A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be

A 1015 kHz and 985 kHz

B 1030 kHz and 970 kHz

C 13 kHz and 17 kHz

D 14 kHz and 16 kHz

ANS:D - 14 kHz and 16 kHz

For upper side band:(fc+fs) =(15000+1000)=16KHZ.
For lower side band:(fc-fs) = (15000-1000)=14KHz, so answer will be (D).



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