Effect on the deviation d of an FM signal when it is passed through a mixer

Q.  What is the effect on the deviation d of an FM signal when it is passed through a mixer?
- Published on 14 Oct 15

a. Doubles
b. Reduces
c. Becomes half
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 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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