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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 present in the modulated signal?
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- 990 kHz
- 1010 kHz
- 1020 kHz
- 1030 kHz
- 990 kHz
Correct Option: C
Given square wave, this carrier, square wave can be represented as From this equation we see that only odd components are present. Hence from the given option frequency component 1020 kHz is not present in the modulated signal. Hence alternative (C) is the correct choice.
