Question

A `1 MHz` carrier signal is modulated by a symmertrical sinusoidal wave for period of `100 mus` in a nonlinear (square lae device).Which of the following frequencies will notbe present in the modulated signal
A. `990 kHz`
B. `1010kHz`
C. `1020kHz`
D. `1030kHz`

Answer 1

Correct Answer - C
The frequency components of modulation signal are from nonlinear device are
`f_(c)`, `f_(c)+-f_(m)`, `f_(c)+-3f_(m)`……
So the frequencies present in the `AM` are `100kHz`, `990 kHz`, `1010 kHz`, `970 kHz`, `1030 kHz`