What factors affect the RF exposure of people near an amateur station antenna?
The correct answer is D: All these choices are correct. Factors that affect RF exposure of people near an amateur station antenna include: frequency and power level of the RF field, distance from the antenna to a person, and radiation pattern of the antenna. All three significantly affect exposure. Higher frequency and power increase exposure, closer distance increases exposure, and antenna pattern determines where radiation is strongest. For amateur radio operators, understanding all these factors helps ensure compliance with RF exposure regulations and protects people near your station.
Exam Tip
All three affect RF exposure: frequency/power, distance, antenna pattern. When all listed factors affect RF exposure, 'all of the above' is usually the answer. All must be considered for exposure assessment.
Memory Aid
"All three affect RF exposure: Frequency/power, Distance, Antenna pattern. Think 'A'll 'F'actors 'D'etermine 'E'xposure. Must consider all three when assessing RF exposure compliance."
Real-World Application
You assess RF exposure near your station: (1) You operate on 50 MHz (high absorption frequency) at 500 watts (high power) - both increase exposure risk, (2) Your antenna is 10 feet from a neighbor's house (close distance) - increases exposure, (3) Your beam antenna points toward the neighbor (radiation pattern) - increases exposure in that direction. All three factors combine to determine total exposure.
Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Distance and antenna pattern also affect exposure.
Option B: While correct, this is incomplete. Frequency/power and antenna pattern also affect exposure.
Option C: While correct, this is incomplete. Frequency/power and distance also affect exposure.
题目解析
The correct answer is D: All these choices are correct. Factors that affect RF exposure of people near an amateur station antenna include: frequency and power level of the RF field, distance from the antenna to a person, and radiation pattern of the antenna. All three significantly affect exposure. Higher frequency and power increase exposure, closer distance increases exposure, and antenna pattern determines where radiation is strongest. For amateur radio operators, understanding all these factors helps ensure compliance with RF exposure regulations and protects people near your station.
考试技巧
All three affect RF exposure: frequency/power, distance, antenna pattern. When all listed factors affect RF exposure, 'all of the above' is usually the answer. All must be considered for exposure assessment.
记忆口诀
All three affect RF exposure: Frequency/power, Distance, Antenna pattern. Think 'A'll 'F'actors 'D'etermine 'E'xposure. Must consider all three when assessing RF exposure compliance.
实际应用示例
You assess RF exposure near your station: (1) You operate on 50 MHz (high absorption frequency) at 500 watts (high power) - both increase exposure risk, (2) Your antenna is 10 feet from a neighbor's house (close distance) - increases exposure, (3) Your beam antenna points toward the neighbor (radiation pattern) - increases exposure in that direction. All three factors combine to determine total exposure.
错误选项分析
Option A: While correct, this is incomplete. Distance and antenna pattern also affect exposure. Option B: While correct, this is incomplete. Frequency/power and antenna pattern also affect exposure. Option C: While correct, this is incomplete. Frequency/power and distance also affect exposure.
知识点
RF exposure factors, Frequency and power, Distance, Antenna pattern
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.