Which of these items would be useful for a hidden transmitter hunt?
The correct answer is B: A directional antenna. A directional antenna would be useful for a hidden transmitter hunt (foxhunting). Directional antennas allow you to determine the direction of the signal source by rotating the antenna and noting where signal strength is maximum (or minimum, depending on antenna type). This is essential for radio direction finding. For amateur radio operators, directional antennas like Yagis, quads, or loops are standard equipment for foxhunting and interference location. Understanding antenna directionality is key to successful transmitter hunting.
Exam Tip
Hidden transmitter hunt = directional antenna. Think 'D'irectional 'A'ntenna = 'D'etermines 'A'zimuth. Allows you to find signal direction by rotating and noting maximum/minimum signal strength. SWR meters and noise bridges measure impedance, not direction.
Memory Aid
"Hidden transmitter hunt = directional antenna. Think 'D'irectional 'A'ntenna = 'D'etermines 'A'zimuth. Rotate antenna to find signal direction. Essential for radio direction finding and foxhunting."
Real-World Application
You're participating in a foxhunt (hidden transmitter hunt). You use a 3-element Yagi antenna that you can rotate. As you turn the antenna, the signal strength varies - maximum when pointing toward the transmitter, minimum when pointing away. By taking bearings from multiple locations, you triangulate the transmitter's location. A directional antenna is essential for this activity.
Key Concepts
Why Other Options Are Wrong
Option A (Calibrated SWR meter): Incorrect. SWR meters measure impedance match, not signal direction. They don't help locate transmitters - they measure antenna matching.
Option C (Calibrated noise bridge): Incorrect. Noise bridges measure antenna impedance, not signal direction. They're for antenna tuning, not direction finding.
Option D: Incorrect. Since A and C are not useful for direction finding, 'all of the above' cannot be correct. Only directional antennas are essential for transmitter hunting.
题目解析
The correct answer is B: A directional antenna. A directional antenna would be useful for a hidden transmitter hunt (foxhunting). Directional antennas allow you to determine the direction of the signal source by rotating the antenna and noting where signal strength is maximum (or minimum, depending on antenna type). This is essential for radio direction finding. For amateur radio operators, directional antennas like Yagis, quads, or loops are standard equipment for foxhunting and interference location. Understanding antenna directionality is key to successful transmitter hunting.
考试技巧
Hidden transmitter hunt = directional antenna. Think 'D'irectional 'A'ntenna = 'D'etermines 'A'zimuth. Allows you to find signal direction by rotating and noting maximum/minimum signal strength. SWR meters and noise bridges measure impedance, not direction.
记忆口诀
Hidden transmitter hunt = directional antenna. Think 'D'irectional 'A'ntenna = 'D'etermines 'A'zimuth. Rotate antenna to find signal direction. Essential for radio direction finding and foxhunting.
实际应用示例
You're participating in a foxhunt (hidden transmitter hunt). You use a 3-element Yagi antenna that you can rotate. As you turn the antenna, the signal strength varies - maximum when pointing toward the transmitter, minimum when pointing away. By taking bearings from multiple locations, you triangulate the transmitter's location. A directional antenna is essential for this activity.
错误选项分析
Option A (Calibrated SWR meter): Incorrect. SWR meters measure impedance match, not signal direction. They don't help locate transmitters - they measure antenna matching. Option C (Calibrated noise bridge): Incorrect. Noise bridges measure antenna impedance, not signal direction. They're for antenna tuning, not direction finding. Option D: Incorrect. Since A and C are not useful for direction finding, 'all of the above' cannot be correct. Only directional antennas are essential for transmitter hunting.
知识点
Directional antennas, Transmitter hunting, Foxhunting, Radio direction finding
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.