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Communication Systems - Engineering

Q1:

A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal?

A 990 kHz

B 1010 kHz

C 1020 kHz

D 1030 kHz

ANS:C - 1020 kHz

1/t = 10 kHz.

1 Mhz+10 kHz = 1010 kHz check.

1 Mhz-10 kHz = 990 kHz check.

1 Mhz + 2*10 kHz = 1020 kHz check.

= 1030 kHz.