Discussion
Why is a crystal-controlled oscillator used for the second conversion?
Answer: B
Because the second conversion is from one fixed frequency to another, the oscillator needs no tuning at all and can therefore be crystal controlled for stability. Drift there would move the signal off the narrow second filter. Injection level and conversion loss are unrelated to the oscillator's type. And smooth tuning is exactly what a crystal does not offer, nor does it need to. Where a frequency need not vary, fixing it with the most stable available reference costs nothing.
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