What percentage of power loss is equivalent to a loss of 1 dB?
The correct answer is C: 20.6 percent. The percentage of power loss equivalent to a loss of 1 dB is 20.6 percent. 1 dB represents about 0.794 power ratio (loss), so power loss = 1 - 0.794 = 0.206 = 20.6%. For amateur radio operators, this helps understand dB losses. Understanding this helps when calculating power losses.
Exam Tip
1 dB loss = 20.6% power loss. Think '1' dB = '2'0.6% loss. 1 dB represents about 0.794 power ratio (loss), so loss = 1 - 0.794 = 20.6%. Not 10.9%, not 12.2%, not 25.9% - just 20.6%.
Memory Aid
"1 dB loss = 20.6% power loss. Think '1' dB = '2'0.6% loss. 1 dB represents about 20.6% power loss. Useful for understanding feed line and component losses."
Real-World Application
You have a 1 dB loss in your feed line. This represents a 20.6% power loss. If you transmit 100 watts, 1 dB loss means about 79.4 watts reach the antenna (20.6% loss). This is the power loss equivalent to 1 dB.
Key Concepts
Why Other Options Are Wrong
Option A (10.9 percent): Incorrect. 10.9% is too low - 1 dB loss is about 20.6%, not 10.9%. Calculation error.
Option B (12.2 percent): Incorrect. 12.2% is too low - 1 dB loss is about 20.6%, not 12.2%. Calculation error.
Option D (25.9 percent): Incorrect. 25.9% is too high - 1 dB loss is about 20.6%, not 25.9%. Calculation error.
题目解析
The correct answer is C: 20.6 percent. The percentage of power loss equivalent to a loss of 1 dB is 20.6 percent. 1 dB represents about 0.794 power ratio (loss), so power loss = 1 - 0.794 = 0.206 = 20.6%. For amateur radio operators, this helps understand dB losses. Understanding this helps when calculating power losses.
考试技巧
1 dB loss = 20.6% power loss. Think '1' dB = '2'0.6% loss. 1 dB represents about 0.794 power ratio (loss), so loss = 1 - 0.794 = 20.6%. Not 10.9%, not 12.2%, not 25.9% - just 20.6%.
记忆口诀
1 dB loss = 20.6% power loss. Think '1' dB = '2'0.6% loss. 1 dB represents about 20.6% power loss. Useful for understanding feed line and component losses.
实际应用示例
You have a 1 dB loss in your feed line. This represents a 20.6% power loss. If you transmit 100 watts, 1 dB loss means about 79.4 watts reach the antenna (20.6% loss). This is the power loss equivalent to 1 dB.
错误选项分析
Option A (10.9 percent): Incorrect. 10.9% is too low - 1 dB loss is about 20.6%, not 10.9%. Calculation error. Option B (12.2 percent): Incorrect. 12.2% is too low - 1 dB loss is about 20.6%, not 12.2%. Calculation error. Option D (25.9 percent): Incorrect. 25.9% is too high - 1 dB loss is about 20.6%, not 25.9%. Calculation error.
知识点
1 dB loss, Power loss percentage, 20.6 percent, dB to percentage
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.