Discussion Forum : Communication Systems
Question -


Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 kHz producing 50% modulation. The lower and upper side-band frequencies in kHz are

Options:
A .   1490, 1510
B .   1510, 1490
C .   11490, 11510
D .   11510, 11490
E .   If assertion is false but reason is true.
Answer: Option A
:
A

Here, fc = 1.5 MHz = 1500 kHz ,fm = = 10 kHz
Low side band frequency
= fc - fm = 1500 kHz - 10 kHz = 1490 kHz
Upper side band frequency
= fc + fm = 1500 kHz + 10 kHz = 1510 kHz



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