How does a diode envelope detector function?
The correct answer is A: By rectification and filtering of RF signals. How does a diode envelope detector function is by rectification and filtering of RF signals. Diode rectifies RF, filter extracts audio. For amateur radio operators, this is important for demodulation. Understanding this helps when working with AM detectors.
Exam Tip
Diode envelope detector function = by rectification and filtering of RF signals. Think 'D'iode 'E'nvelope 'D'etector = 'D'emodulates 'E'nvelope (rectify and filter). Diode rectifies RF, filter extracts audio. Not Zener breakdown, not mixing with noise, not reactance change - just rectification and filtering.
Memory Aid
"Diode envelope detector function = by rectification and filtering of RF signals. Think 'D'iode 'E'nvelope = 'R'ectify and 'F'ilter. Diode rectifies RF, filter extracts audio. Important for demodulation."
Real-World Application
A diode envelope detector: It functions by rectification and filtering of RF signals. The diode rectifies the RF signal, and a filter extracts the audio envelope. This is how it functions - rectification and filtering.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. By breakdown of Zener voltage isn't how envelope detector works - envelope detector rectifies and filters. Zener breakdown isn't how it works.
Option C: Incorrect. By mixing signals with noise in transition region isn't how envelope detector works - envelope detector rectifies and filters. Mixing with noise isn't how it works.
Option D: Incorrect. By sensing change of reactance with frequency isn't how envelope detector works - envelope detector rectifies and filters. Reactance change isn't how it works.
题目解析
The correct answer is A: By rectification and filtering of RF signals. How does a diode envelope detector function is by rectification and filtering of RF signals. Diode rectifies RF, filter extracts audio. For amateur radio operators, this is important for demodulation. Understanding this helps when working with AM detectors.
考试技巧
Diode envelope detector function = by rectification and filtering of RF signals. Think 'D'iode 'E'nvelope 'D'etector = 'D'emodulates 'E'nvelope (rectify and filter). Diode rectifies RF, filter extracts audio. Not Zener breakdown, not mixing with noise, not reactance change - just rectification and filtering.
记忆口诀
Diode envelope detector function = by rectification and filtering of RF signals. Think 'D'iode 'E'nvelope = 'R'ectify and 'F'ilter. Diode rectifies RF, filter extracts audio. Important for demodulation.
实际应用示例
A diode envelope detector: It functions by rectification and filtering of RF signals. The diode rectifies the RF signal, and a filter extracts the audio envelope. This is how it functions - rectification and filtering.
错误选项分析
Option B: Incorrect. By breakdown of Zener voltage isn't how envelope detector works - envelope detector rectifies and filters. Zener breakdown isn't how it works. Option C: Incorrect. By mixing signals with noise in transition region isn't how envelope detector works - envelope detector rectifies and filters. Mixing with noise isn't how it works. Option D: Incorrect. By sensing change of reactance with frequency isn't how envelope detector works - envelope detector rectifies and filters. Reactance change isn't how it works.
知识点
Diode envelope detector, How it functions, Rectification and filtering, RF signals
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.