Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?
The correct answer is C: Antenna and feed line. What must be connected to an antenna analyzer when it is being used for SWR measurements is antenna and feed line. The analyzer connects to the feed line, which connects to the antenna, to measure the system's impedance and SWR. For amateur radio operators, this is how antenna analyzers are used. Understanding this helps when using antenna analyzers.
Exam Tip
Antenna analyzer for SWR = antenna and feed line connected. Think 'A'ntenna 'A'nalyzer = 'A'ntenna 'A'nd feed line. Analyzer connects to feed line, which connects to antenna, to measure impedance and SWR. Not receiver, not transmitter - just antenna and feed line.
Memory Aid
"Antenna analyzer for SWR = antenna and feed line connected. Think 'A'ntenna 'A'nalyzer = 'A'ntenna 'A'nd feed line. Analyzer connects to feed line/antenna to measure impedance and SWR. No receiver or transmitter needed."
Real-World Application
You use an antenna analyzer to measure SWR. You connect the analyzer to the feed line, and the feed line connects to the antenna. The analyzer generates a low-power test signal and measures the impedance and SWR. No receiver or transmitter is needed - the analyzer does everything.
Key Concepts
Why Other Options Are Wrong
Option A (Receiver): Incorrect. Receivers aren't needed for SWR measurements - antenna analyzers generate their own test signals. Receivers aren't part of the measurement setup.
Option B (Transmitter): Incorrect. Transmitters aren't needed for SWR measurements - antenna analyzers generate their own low-power test signals. Transmitters aren't part of the measurement setup.
Option D: Incorrect. Since A and B are not needed, 'all of the above' cannot be correct. Only antenna and feed line are needed.
题目解析
The correct answer is C: Antenna and feed line. What must be connected to an antenna analyzer when it is being used for SWR measurements is antenna and feed line. The analyzer connects to the feed line, which connects to the antenna, to measure the system's impedance and SWR. For amateur radio operators, this is how antenna analyzers are used. Understanding this helps when using antenna analyzers.
考试技巧
Antenna analyzer for SWR = antenna and feed line connected. Think 'A'ntenna 'A'nalyzer = 'A'ntenna 'A'nd feed line. Analyzer connects to feed line, which connects to antenna, to measure impedance and SWR. Not receiver, not transmitter - just antenna and feed line.
记忆口诀
Antenna analyzer for SWR = antenna and feed line connected. Think 'A'ntenna 'A'nalyzer = 'A'ntenna 'A'nd feed line. Analyzer connects to feed line/antenna to measure impedance and SWR. No receiver or transmitter needed.
实际应用示例
You use an antenna analyzer to measure SWR. You connect the analyzer to the feed line, and the feed line connects to the antenna. The analyzer generates a low-power test signal and measures the impedance and SWR. No receiver or transmitter is needed - the analyzer does everything.
错误选项分析
Option A (Receiver): Incorrect. Receivers aren't needed for SWR measurements - antenna analyzers generate their own test signals. Receivers aren't part of the measurement setup. Option B (Transmitter): Incorrect. Transmitters aren't needed for SWR measurements - antenna analyzers generate their own low-power test signals. Transmitters aren't part of the measurement setup. Option D: Incorrect. Since A and B are not needed, 'all of the above' cannot be correct. Only antenna and feed line are needed.
知识点
Antenna analyzer, SWR measurements, Antenna and feed line, Impedance measurement
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.