Deep Dive: E4D07
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E4D
Reference: 2024-2028 Question Pool · E4 - Amateur Practices
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E4D topic.