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Radio Receivers

Q1:

When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is

A 555 kHz

B 1010 kHz

C 1465 kHz

D 1920 kHz

ANS:C - 1465 kHz

IF = 455 KHz,
Fo = 1010 KHz,
Fo = Fs + Fi.

1010 KHz = Fs + 455 KHz.
Fs = 555 KHz,
Fsi = Fs + 2Fi,
Fsi = 555 KHz + 910 KHz = 1465 KHz.



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