Which of the following could be a cause of interference covering a wide range of frequencies?
The correct answer is C: Arcing at a poor electrical connection. A cause of interference covering a wide range of frequencies is arcing at a poor electrical connection. Arcing creates broadband noise that covers many frequencies. For amateur radio operators, this is a common source of wideband interference. Understanding this helps when troubleshooting interference.
Exam Tip
Wide-range interference cause = arcing at poor electrical connection. Think 'A'rcing = 'A'cross 'W'ide frequencies. Arcing creates broadband noise covering many frequencies. Not balun issues, not rectification - just arcing at poor connections.
Memory Aid
"Wide-range interference cause = arcing at poor electrical connection. Think 'A'rcing = 'A'cross 'W'ide frequencies. Arcing creates broadband noise covering many frequencies. Common source of wideband interference."
Real-World Application
You hear interference across a wide range of frequencies. Investigation reveals a loose connection in your power wiring that's arcing. The arcing creates broadband noise that covers many frequencies. Tightening the connection eliminates the interference. Arcing at poor connections is a common source of wideband interference.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Not using a balun doesn't cause wide-range interference - it might cause common-mode current, but not wideband noise. Balun issues are more specific.
Option B: Incorrect. Lack of rectification doesn't cause interference - rectification would actually create interference, not lack of it. This doesn't make sense.
Option D: Incorrect. Using a balun to feed an unbalanced antenna doesn't cause wide-range interference - it might cause some issues, but not wideband noise. Balun issues are more specific.
题目解析
The correct answer is C: Arcing at a poor electrical connection. A cause of interference covering a wide range of frequencies is arcing at a poor electrical connection. Arcing creates broadband noise that covers many frequencies. For amateur radio operators, this is a common source of wideband interference. Understanding this helps when troubleshooting interference.
考试技巧
Wide-range interference cause = arcing at poor electrical connection. Think 'A'rcing = 'A'cross 'W'ide frequencies. Arcing creates broadband noise covering many frequencies. Not balun issues, not rectification - just arcing at poor connections.
记忆口诀
Wide-range interference cause = arcing at poor electrical connection. Think 'A'rcing = 'A'cross 'W'ide frequencies. Arcing creates broadband noise covering many frequencies. Common source of wideband interference.
实际应用示例
You hear interference across a wide range of frequencies. Investigation reveals a loose connection in your power wiring that's arcing. The arcing creates broadband noise that covers many frequencies. Tightening the connection eliminates the interference. Arcing at poor connections is a common source of wideband interference.
错误选项分析
Option A: Incorrect. Not using a balun doesn't cause wide-range interference - it might cause common-mode current, but not wideband noise. Balun issues are more specific. Option B: Incorrect. Lack of rectification doesn't cause interference - rectification would actually create interference, not lack of it. This doesn't make sense. Option D: Incorrect. Using a balun to feed an unbalanced antenna doesn't cause wide-range interference - it might cause some issues, but not wideband noise. Balun issues are more specific.
知识点
Arcing, Poor electrical connection, Wide range frequencies, Broadband interference
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.