Which of the following actions can reduce exposure to RF radiation?
The correct answer is A: Relocate antennas. An action that can reduce exposure to RF radiation is to relocate antennas. Moving antennas farther from people or to locations with less exposure reduces RF exposure. This is often the simplest solution. For amateur radio operators, antenna placement is a key factor in RF exposure. Understanding this helps ensure compliance and protect people near your station. Relocating antennas is often more practical than other options.
Exam Tip
Reduce RF exposure = relocate antennas. Think 'R'elocate 'A'ntennas = 'R'educe 'A'ccess (exposure). Moving antennas farther from people reduces exposure. Relocating transmitter doesn't help, increasing duty cycle increases exposure.
Memory Aid
"Reduce RF exposure = relocate antennas. Think 'R'elocate 'A'ntennas = 'R'educe 'A'ccess. Moving antennas farther from people reduces exposure. Most effective way to reduce exposure."
Real-World Application
Your antenna is 10 feet from a neighbor's house, causing high RF exposure. You relocate the antenna to the other side of your property, 50 feet from the neighbor. This significantly reduces their exposure because RF field strength decreases with distance. Relocating the antenna is more effective than moving the transmitter or changing duty cycle.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Relocating the transmitter doesn't significantly reduce exposure - it's the antenna that radiates RF. Moving the transmitter a few feet doesn't help if the antenna is still close to people.
Option C: Incorrect. Increasing duty cycle increases exposure, not reduces it. Higher duty cycle means more transmitting time, which increases average exposure.
Option D: Incorrect. Since B and C don't reduce exposure, 'all of the above' cannot be correct. Only relocating antennas reduces exposure.
题目解析
The correct answer is A: Relocate antennas. An action that can reduce exposure to RF radiation is to relocate antennas. Moving antennas farther from people or to locations with less exposure reduces RF exposure. This is often the simplest solution. For amateur radio operators, antenna placement is a key factor in RF exposure. Understanding this helps ensure compliance and protect people near your station. Relocating antennas is often more practical than other options.
考试技巧
Reduce RF exposure = relocate antennas. Think 'R'elocate 'A'ntennas = 'R'educe 'A'ccess (exposure). Moving antennas farther from people reduces exposure. Relocating transmitter doesn't help, increasing duty cycle increases exposure.
记忆口诀
Reduce RF exposure = relocate antennas. Think 'R'elocate 'A'ntennas = 'R'educe 'A'ccess. Moving antennas farther from people reduces exposure. Most effective way to reduce exposure.
实际应用示例
Your antenna is 10 feet from a neighbor's house, causing high RF exposure. You relocate the antenna to the other side of your property, 50 feet from the neighbor. This significantly reduces their exposure because RF field strength decreases with distance. Relocating the antenna is more effective than moving the transmitter or changing duty cycle.
错误选项分析
Option B: Incorrect. Relocating the transmitter doesn't significantly reduce exposure - it's the antenna that radiates RF. Moving the transmitter a few feet doesn't help if the antenna is still close to people. Option C: Incorrect. Increasing duty cycle increases exposure, not reduces it. Higher duty cycle means more transmitting time, which increases average exposure. Option D: Incorrect. Since B and C don't reduce exposure, 'all of the above' cannot be correct. Only relocating antennas reduces exposure.
知识点
RF exposure reduction, Antenna relocation, RF safety, Exposure control
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.