Discussion
Which of the following is not a cause of a spurious response?
Correct alignment of the intermediate frequency transformers
Harmonics of the local oscillator
Harmonics of the incoming signal
Half-intermediate-frequency mixing products
Answer: D
Correct alignment is a remedy rather than a cause; the other three are genuine mixing mechanisms that place unwanted inputs inside the passband. Spurious responses arise from the mixer's willingness to combine any pair of frequencies whose harmonics happen to differ by the intermediate frequency, which is a large set. Their cure is selectivity before the mixer and a clean oscillator, since nothing after conversion can help.
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