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Question

In an AM superheterodyne receiver that local osicllator frequency of the mixer is set at thehigher of the two possible values, such that fLO>fc always. The intermediate frequency(IF) of the receier is 450 kHz and the receiver is tuned to a station carrier frequency of 600kHz. If the RF amplifier is failed to reject the image frequency and the loaded quality factorof the RF amplifier is 100, then the image rejection ratio of the receiver at the selectedstation frequency will be_______
  1. 210

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Solution

The correct option is A 210
Q=100fsi=fc+2(IF)=600+2(450)=1500kHzP=fsifcfcfsi=15006006001500=2.1Image rejection ratio,α=1+P2Q2=1+(21×)2=210

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