Which of the following reduces the likelihood of receiver desensitization?
The correct answer is A: Insert attenuation before the first RF stage. Which of the following reduces the likelihood of receiver desensitization is to insert attenuation before the first RF stage. Attenuation before the first RF stage reduces strong signals before they can cause desensitization. For amateur radio operators, this is important for receiver operation. Understanding this helps when reducing desensitization.
Exam Tip
Reduce desensitization = insert attenuation before first RF stage. Think 'R'educe 'D'esensitization = 'A'ttenuation 'B'efore 'R'F stage. Attenuation before the first RF stage reduces strong signals before they can cause desensitization. Not IF frequency, not front-end gain, not AGC speed - just attenuation before first RF stage.
Memory Aid
"Reduce desensitization = insert attenuation before first RF stage. Think 'R'educe 'D'esensitization = 'A'ttenuation. Attenuation before the first RF stage reduces strong signals before they can cause desensitization. Important for receiver operation."
Real-World Application
Reducing the likelihood of receiver desensitization: Insert attenuation before the first RF stage. This reduces strong signals before they enter the receiver, preventing overload and desensitization. This is the solution - attenuation before first RF stage.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Raising receiver's IF frequency doesn't reduce desensitization - attenuation before first RF stage does. IF frequency isn't the solution.
Option C: Incorrect. Increasing receiver's front-end gain doesn't reduce desensitization - it makes it worse. Front-end gain increase is wrong.
Option D: Incorrect. Switching from fast AGC to slow AGC doesn't reduce desensitization - attenuation before first RF stage does. AGC speed isn't the solution.
题目解析
The correct answer is A: Insert attenuation before the first RF stage. Which of the following reduces the likelihood of receiver desensitization is to insert attenuation before the first RF stage. Attenuation before the first RF stage reduces strong signals before they can cause desensitization. For amateur radio operators, this is important for receiver operation. Understanding this helps when reducing desensitization.
考试技巧
Reduce desensitization = insert attenuation before first RF stage. Think 'R'educe 'D'esensitization = 'A'ttenuation 'B'efore 'R'F stage. Attenuation before the first RF stage reduces strong signals before they can cause desensitization. Not IF frequency, not front-end gain, not AGC speed - just attenuation before first RF stage.
记忆口诀
Reduce desensitization = insert attenuation before first RF stage. Think 'R'educe 'D'esensitization = 'A'ttenuation. Attenuation before the first RF stage reduces strong signals before they can cause desensitization. Important for receiver operation.
实际应用示例
Reducing the likelihood of receiver desensitization: Insert attenuation before the first RF stage. This reduces strong signals before they enter the receiver, preventing overload and desensitization. This is the solution - attenuation before first RF stage.
错误选项分析
Option B: Incorrect. Raising receiver's IF frequency doesn't reduce desensitization - attenuation before first RF stage does. IF frequency isn't the solution. Option C: Incorrect. Increasing receiver's front-end gain doesn't reduce desensitization - it makes it worse. Front-end gain increase is wrong. Option D: Incorrect. Switching from fast AGC to slow AGC doesn't reduce desensitization - attenuation before first RF stage does. AGC speed isn't the solution.
知识点
Reduce likelihood of receiver desensitization, Insert attenuation, Before first RF stage, Desensitization reduction
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.