What is the relationship between transmitted symbol rate and bandwidth?
The correct answer is B: Higher symbol rates require wider bandwidth. The relationship between transmitted symbol rate and bandwidth is that higher symbol rates require wider bandwidth. More symbols per second means more information, requiring more bandwidth. For amateur radio operators, this explains digital mode bandwidth requirements. Understanding this helps when operating digital modes.
Exam Tip
Symbol rate and bandwidth relationship = higher symbol rates require wider bandwidth. Think 'H'igher 'S'ymbol 'R'ate = 'H'igher 'S'ignal 'R'equirements = 'W'ider 'B'andwidth. More symbols per second means more information, requiring more bandwidth. Not unrelated, not lower rates wider, not half - just higher rates wider.
Memory Aid
"Symbol rate and bandwidth relationship = higher symbol rates require wider bandwidth. Think 'H'igher 'S'ymbol 'R'ate = 'W'ider 'B'andwidth. More symbols per second means more information, requiring more bandwidth. Fundamental digital mode relationship."
Real-World Application
Digital modes: PSK31 uses 31.25 symbols/second, requiring about 31 Hz bandwidth. Higher symbol rate modes (e.g., 300 baud) require wider bandwidth (e.g., 300 Hz). Higher symbol rates mean more information per second, which requires wider bandwidth to transmit. This is the fundamental relationship - higher symbol rates need wider bandwidth.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Symbol rate and bandwidth are related - higher symbol rates require wider bandwidth. They're not unrelated.
Option C: Incorrect. Lower symbol rates don't require wider bandwidth - lower rates require less bandwidth, not more. Lower rates need less bandwidth.
Option D: Incorrect. Bandwidth isn't half the symbol rate - bandwidth is typically equal to or greater than symbol rate, not half. Half isn't the relationship.
题目解析
The correct answer is B: Higher symbol rates require wider bandwidth. The relationship between transmitted symbol rate and bandwidth is that higher symbol rates require wider bandwidth. More symbols per second means more information, requiring more bandwidth. For amateur radio operators, this explains digital mode bandwidth requirements. Understanding this helps when operating digital modes.
考试技巧
Symbol rate and bandwidth relationship = higher symbol rates require wider bandwidth. Think 'H'igher 'S'ymbol 'R'ate = 'H'igher 'S'ignal 'R'equirements = 'W'ider 'B'andwidth. More symbols per second means more information, requiring more bandwidth. Not unrelated, not lower rates wider, not half - just higher rates wider.
记忆口诀
Symbol rate and bandwidth relationship = higher symbol rates require wider bandwidth. Think 'H'igher 'S'ymbol 'R'ate = 'W'ider 'B'andwidth. More symbols per second means more information, requiring more bandwidth. Fundamental digital mode relationship.
实际应用示例
Digital modes: PSK31 uses 31.25 symbols/second, requiring about 31 Hz bandwidth. Higher symbol rate modes (e.g., 300 baud) require wider bandwidth (e.g., 300 Hz). Higher symbol rates mean more information per second, which requires wider bandwidth to transmit. This is the fundamental relationship - higher symbol rates need wider bandwidth.
错误选项分析
Option A: Incorrect. Symbol rate and bandwidth are related - higher symbol rates require wider bandwidth. They're not unrelated. Option C: Incorrect. Lower symbol rates don't require wider bandwidth - lower rates require less bandwidth, not more. Lower rates need less bandwidth. Option D: Incorrect. Bandwidth isn't half the symbol rate - bandwidth is typically equal to or greater than symbol rate, not half. Half isn't the relationship.
知识点
Symbol rate, Bandwidth, Higher symbol rates, Wider bandwidth
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.