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Radio Receivers - Engineering

Q1:

In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 25 MHz will be

A 24.09 MHz

B 24.54 MHz

C 25.45 MHz

D 25.91 MHz

ANS:D - 25.91 MHz

Fs = 25MHz.
Fi = 455KHz = 455/1000 MHz =0.455.

Fsi=Fs+2Fi.
= 25 + 2(0.455).
Fsi = 25.91MHz.