Discussion
Match each unwanted response with where it must be dealt with.
List I
A. Image frequency
B. Adjacent channel
C. Audio hum
List II
P. Before the mixer
Q. In the IF filter
R. In the power supply and wiring
Select the correct match.
Answer: A
The pairing is A-P, B-Q, C-R. The image must go before conversion because afterwards it is indistinguishable; an adjacent channel remains distinguishable and so is the intermediate frequency filter's business; and hum enters through the supply and is cured there. Every unwanted signal has exactly one place in the chain where it can still be told apart from the wanted one, and that place is where the remedy belongs.
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