Discussion
Consider the following statements about double conversion.
1. The first intermediate frequency is chosen high for image rejection
2. The second is chosen low for adjacent channel selectivity
3. The second oscillator is usually crystal controlled
Which of the statements given above is or are correct?
Answer: B
All three are correct, and together they describe the architecture completely: the high first stage handles the image, the low second stage handles the neighbours, and because the second conversion is between two fixed frequencies its oscillator need not tune at all and can therefore be crystal controlled. Each choice follows from the job that stage has to do, which is why the architecture is easier to reconstruct than to memorise.
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