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Radio Receivers - Engineering

Q1:

In a broadcast superheterodyne receiver

A the local oscillator operates below the signal frequency

B local oscillator frequency is normally double the IF

C RF amplifier normally works at kHz above the carrier frequency

D mixer input must be tuned to the signal frequency

ANS:D - mixer input must be tuned to the signal frequency

The same frequency used at sender side is used at receiver side mixer in order to discard the carrier as the heterodyne means same mixing.