Question
Which of the following receiver circuits can be effective in eliminating interference from strong out-of-band signals?
Answer Options
- A) A front-end filter or preselector
- B) A narrow IF filter
- C) A notch filter
- D) A properly adjusted product detector
Correct Answer: A
Explanation
Interference from strong out-of-band signals is a common problem in receivers, capable of causing overload, desensitization, or intermodulation distortion before the signal even reaches the selectivity stages. The only way to combat these extremely strong signals is to reduce their strength early in the signal chain.
The most effective circuit for this task is a front-end filter or preselector. These tuned circuits or filters are placed directly after the antenna and before the first sensitive amplifier (RF stage). They pass only the desired amateur band or frequency segment, significantly attenuating all strong signals outside of that range, thereby preventing the early stages of the receiver from overloading.
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