What is an effect of excessive phase noise in an SDR receiver’s master clock oscillator?
The correct answer is D: It can combine with strong signals on nearby frequencies to generate interference. What is an effect of excessive phase noise in an SDR receiver's master clock oscillator is that it can combine with strong signals on nearby frequencies to generate interference. Phase noise can mix with nearby signals, creating interference. For amateur radio operators, this is important for receiver performance. Understanding this helps when troubleshooting interference.
Exam Tip
Excessive phase noise effect = can combine with strong signals on nearby frequencies to generate interference. Think 'P'hase 'N'oise = 'P'roblematic 'N'earby interference. Phase noise can mix with nearby signals, creating interference. Not limiting strong signals, not frequency calibration, not third-order intercept - just interference from nearby signals.
Memory Aid
"Excessive phase noise effect = can combine with strong signals on nearby frequencies to generate interference. Think 'P'hase 'N'oise = 'I'nterference. Phase noise can mix with nearby signals, creating interference. Important for receiver performance."
Real-World Application
Excessive phase noise in an SDR receiver's master clock oscillator: It can combine with strong signals on nearby frequencies to generate interference. The phase noise sidebands can mix with nearby strong signals, creating unwanted interference products. This is the effect - interference from nearby signals.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Limiting ability to receive strong signals isn't the effect - phase noise combines with nearby signals to create interference. Limiting strong signals isn't the effect.
Option B: Incorrect. Affecting frequency calibration isn't the primary effect - phase noise combines with nearby signals to create interference. Frequency calibration isn't the effect.
Option C: Incorrect. Decreasing third-order intercept point isn't the effect - phase noise combines with nearby signals to create interference. Third-order intercept isn't the effect.
题目解析
The correct answer is D: It can combine with strong signals on nearby frequencies to generate interference. What is an effect of excessive phase noise in an SDR receiver's master clock oscillator is that it can combine with strong signals on nearby frequencies to generate interference. Phase noise can mix with nearby signals, creating interference. For amateur radio operators, this is important for receiver performance. Understanding this helps when troubleshooting interference.
考试技巧
Excessive phase noise effect = can combine with strong signals on nearby frequencies to generate interference. Think 'P'hase 'N'oise = 'P'roblematic 'N'earby interference. Phase noise can mix with nearby signals, creating interference. Not limiting strong signals, not frequency calibration, not third-order intercept - just interference from nearby signals.
记忆口诀
Excessive phase noise effect = can combine with strong signals on nearby frequencies to generate interference. Think 'P'hase 'N'oise = 'I'nterference. Phase noise can mix with nearby signals, creating interference. Important for receiver performance.
实际应用示例
Excessive phase noise in an SDR receiver's master clock oscillator: It can combine with strong signals on nearby frequencies to generate interference. The phase noise sidebands can mix with nearby strong signals, creating unwanted interference products. This is the effect - interference from nearby signals.
错误选项分析
Option A: Incorrect. Limiting ability to receive strong signals isn't the effect - phase noise combines with nearby signals to create interference. Limiting strong signals isn't the effect. Option B: Incorrect. Affecting frequency calibration isn't the primary effect - phase noise combines with nearby signals to create interference. Frequency calibration isn't the effect. Option C: Incorrect. Decreasing third-order intercept point isn't the effect - phase noise combines with nearby signals to create interference. Third-order intercept isn't the effect.
知识点
Excessive phase noise, SDR receiver, Master clock oscillator, Combine with strong signals, Generate interference
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.