Communication Systems

Q1: An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

A 102.3

B 113

C 70.2

D 80.9

ANS:B - 113

Option A is correct.

FM Intermediate frequency 10.7 MHz.
Here FM receiver tuned frequency is 91.6 MHz.

Receiver tuned frequency - Intermediate frequency = Signal frequency.
91.6 - 10.7 = 80.9 MHz.

Image frequency = Signal frequency + 2 * Intermediate frequency.
80.9 + 2 * 10.7 = 102.3 MHz.



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