Which of the following types of noise are removed by a noise blanker?
The correct answer is B: Impulse noise. Which of the following types of noise are removed by a noise blanker is impulse noise. Noise blankers are designed to remove impulse noise (short bursts). For amateur radio operators, this is important for receiver operation. Understanding this helps when using noise blankers.
Exam Tip
Noise blanker removes = impulse noise. Think 'N'oise 'B'lanker = 'N'arrow 'B'ursts (impulse). Noise blankers are designed to remove impulse noise (short bursts). Not broadband white noise, not hum and buzz - just impulse noise.
Memory Aid
"Noise blanker removes = impulse noise. Think 'N'oise 'B'lanker = 'I'mpulse noise. Noise blankers are designed to remove impulse noise (short bursts). Important for receiver operation."
Real-World Application
A noise blanker: It removes impulse noise - short bursts of noise like ignition noise, power line arcing, etc. Noise blankers detect these impulses and blank (mute) the receiver during the impulse. This is what noise blankers remove - impulse noise.
Key Concepts
Why Other Options Are Wrong
Option A (Broadband white noise): Incorrect. Broadband white noise isn't removed by noise blankers - noise blankers remove impulse noise. Broadband white noise isn't removed.
Option C (Hum and buzz): Incorrect. Hum and buzz aren't removed by noise blankers - noise blankers remove impulse noise. Hum and buzz aren't removed.
Option D: Incorrect. Since A and C are not correct, 'all of the above' cannot be correct. Only impulse noise is removed.
题目解析
The correct answer is B: Impulse noise. Which of the following types of noise are removed by a noise blanker is impulse noise. Noise blankers are designed to remove impulse noise (short bursts). For amateur radio operators, this is important for receiver operation. Understanding this helps when using noise blankers.
考试技巧
Noise blanker removes = impulse noise. Think 'N'oise 'B'lanker = 'N'arrow 'B'ursts (impulse). Noise blankers are designed to remove impulse noise (short bursts). Not broadband white noise, not hum and buzz - just impulse noise.
记忆口诀
Noise blanker removes = impulse noise. Think 'N'oise 'B'lanker = 'I'mpulse noise. Noise blankers are designed to remove impulse noise (short bursts). Important for receiver operation.
实际应用示例
A noise blanker: It removes impulse noise - short bursts of noise like ignition noise, power line arcing, etc. Noise blankers detect these impulses and blank (mute) the receiver during the impulse. This is what noise blankers remove - impulse noise.
错误选项分析
Option A (Broadband white noise): Incorrect. Broadband white noise isn't removed by noise blankers - noise blankers remove impulse noise. Broadband white noise isn't removed. Option C (Hum and buzz): Incorrect. Hum and buzz aren't removed by noise blankers - noise blankers remove impulse noise. Hum and buzz aren't removed. Option D: Incorrect. Since A and C are not correct, 'all of the above' cannot be correct. Only impulse noise is removed.
知识点
Noise blanker, Types of noise, Impulse noise, Noise removal
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.