What undesirable effect can occur when using a noise blanker?
The correct answer is C: Strong signals may be distorted and appear to cause spurious emissions. What undesirable effect can occur when using a noise blanker is that strong signals may be distorted and appear to cause spurious emissions. Noise blankers can distort strong signals. For amateur radio operators, this is important for receiver operation. Understanding this helps when using noise blankers.
Exam Tip
Noise blanker undesirable effect = strong signals may be distorted and appear to cause spurious emissions. Think 'N'oise 'B'lanker = 'N'egative 'B'yeffect on strong signals. Noise blankers can distort strong signals. Not echo, not bandwidth compression, not FM demodulation - just strong signal distortion.
Memory Aid
"Noise blanker undesirable effect = strong signals may be distorted and appear to cause spurious emissions. Think 'N'oise 'B'lanker = 'S'trong signal distortion. Noise blankers can distort strong signals. Important for receiver operation."
Real-World Application
Using a noise blanker: An undesirable effect is that strong signals may be distorted and appear to cause spurious emissions. The noise blanker can clip or distort strong signals, making them look like spurious emissions. This is the effect - strong signal distortion.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Received audio having echo effect isn't the problem - strong signals being distorted is the problem. Echo effect isn't the problem.
Option B: Incorrect. Audio frequency bandwidth compression isn't the problem - strong signals being distorted is the problem. Bandwidth compression isn't the problem.
Option D: Incorrect. FM signals no longer being demodulated isn't the problem - strong signals being distorted is the problem. FM demodulation isn't the problem.
题目解析
The correct answer is C: Strong signals may be distorted and appear to cause spurious emissions. What undesirable effect can occur when using a noise blanker is that strong signals may be distorted and appear to cause spurious emissions. Noise blankers can distort strong signals. For amateur radio operators, this is important for receiver operation. Understanding this helps when using noise blankers.
考试技巧
Noise blanker undesirable effect = strong signals may be distorted and appear to cause spurious emissions. Think 'N'oise 'B'lanker = 'N'egative 'B'yeffect on strong signals. Noise blankers can distort strong signals. Not echo, not bandwidth compression, not FM demodulation - just strong signal distortion.
记忆口诀
Noise blanker undesirable effect = strong signals may be distorted and appear to cause spurious emissions. Think 'N'oise 'B'lanker = 'S'trong signal distortion. Noise blankers can distort strong signals. Important for receiver operation.
实际应用示例
Using a noise blanker: An undesirable effect is that strong signals may be distorted and appear to cause spurious emissions. The noise blanker can clip or distort strong signals, making them look like spurious emissions. This is the effect - strong signal distortion.
错误选项分析
Option A: Incorrect. Received audio having echo effect isn't the problem - strong signals being distorted is the problem. Echo effect isn't the problem. Option B: Incorrect. Audio frequency bandwidth compression isn't the problem - strong signals being distorted is the problem. Bandwidth compression isn't the problem. Option D: Incorrect. FM signals no longer being demodulated isn't the problem - strong signals being distorted is the problem. FM demodulation isn't the problem.
知识点
Noise blanker, Undesirable effect, Strong signals distorted, Appear to cause spurious emissions
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.