Change in frequency deviation for change in modulating frequency through mixer

Q.  After passing the FM signal through mixer, what is the change in the frequency deviation Δ when the modulating frequency is doubled?
- Published on 14 Oct 15

a. Becomes 2 Δ
b. Becomes Δ /2
c. Becomes Δ2
d. Remains unchanged

ANSWER: Remains unchanged
 
When a carrier is Frequency modulated, the output signal has the frequency deviated above and below the carrier frequency, this is known as Frequency Deviation. When the FM signal is passed through a mixer, the mixer changes the carrier frequency but the deviation remains unchanged.

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