An SDR receiver is overloaded when input signals exceed what level?
The correct answer is D: The reference voltage of the analog-to-digital converter. An SDR receiver is overloaded when input signals exceed what level is the reference voltage of the analog-to-digital converter. ADC reference voltage is the maximum input level. For amateur radio operators, this is important for SDR operation. Understanding this helps when using SDRs.
Exam Tip
SDR overload level = reference voltage of ADC. Think 'S'DR 'O'verload = 'A'DC 'R'eference. ADC reference voltage is the maximum input level. Not sample rate, not buffer size, not count value - just ADC reference voltage.
Memory Aid
"SDR overload level = reference voltage of ADC. Think 'S'DR 'O'verload = 'A'DC 'R'eference. ADC reference voltage is the maximum input level. Important for SDR operation."
Real-World Application
An SDR receiver: It's overloaded when input signals exceed the reference voltage of the analog-to-digital converter. The ADC reference voltage sets the maximum input level. Signals above this level cause clipping/overload. This is the level - ADC reference voltage.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. One-half of maximum sample rate isn't the overload level - ADC reference voltage is. Sample rate isn't the level.
Option B: Incorrect. One-half of maximum sampling buffer size isn't the overload level - ADC reference voltage is. Buffer size isn't the level.
Option C: Incorrect. Maximum count value of ADC isn't the overload level - ADC reference voltage is. Count value isn't the level.
题目解析
The correct answer is D: The reference voltage of the analog-to-digital converter. An SDR receiver is overloaded when input signals exceed what level is the reference voltage of the analog-to-digital converter. ADC reference voltage is the maximum input level. For amateur radio operators, this is important for SDR operation. Understanding this helps when using SDRs.
考试技巧
SDR overload level = reference voltage of ADC. Think 'S'DR 'O'verload = 'A'DC 'R'eference. ADC reference voltage is the maximum input level. Not sample rate, not buffer size, not count value - just ADC reference voltage.
记忆口诀
SDR overload level = reference voltage of ADC. Think 'S'DR 'O'verload = 'A'DC 'R'eference. ADC reference voltage is the maximum input level. Important for SDR operation.
实际应用示例
An SDR receiver: It's overloaded when input signals exceed the reference voltage of the analog-to-digital converter. The ADC reference voltage sets the maximum input level. Signals above this level cause clipping/overload. This is the level - ADC reference voltage.
错误选项分析
Option A: Incorrect. One-half of maximum sample rate isn't the overload level - ADC reference voltage is. Sample rate isn't the level. Option B: Incorrect. One-half of maximum sampling buffer size isn't the overload level - ADC reference voltage is. Buffer size isn't the level. Option C: Incorrect. Maximum count value of ADC isn't the overload level - ADC reference voltage is. Count value isn't the level.
知识点
SDR receiver, Overloaded, Input signals exceed, Reference voltage, Analog-to-digital converter
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.