When evaluating RF exposure levels from your station at a neighbor’s home, what must you do?
The correct answer is B: Ensure signals from your station are less than the uncontrolled maximum permissible exposure (MPE) limits. When evaluating RF exposure levels from your station at a neighbor's home, you must ensure signals are less than the uncontrolled maximum permissible exposure (MPE) limits. Uncontrolled exposure applies to the general public.
MPE limits have two categories: controlled (for operators and people who know about the exposure) and uncontrolled (for the general public). At a neighbor's home, the people are members of the general public who don't know about or control the exposure, so uncontrolled limits apply. Uncontrolled limits are stricter (lower) than controlled limits to protect the general public. You must ensure your station's RF exposure at the neighbor's location doesn't exceed these uncontrolled MPE limits. This is a legal requirement under FCC rules.
Exam Tip
Neighbor RF exposure = Uncontrolled MPE limits. Remember: When evaluating RF exposure at a neighbor's home, you must ensure signals are less than the uncontrolled MPE limits because neighbors are members of the general public.
Memory Aid
"**N**eighbor **R**F **E**xposure = **U**ncontrolled **M**PE (think 'NRE = UMPE')"
Real-World Application
You operate a high-power station. Your neighbor's house is 50 feet away. You must evaluate RF exposure at your neighbor's location. Since your neighbor is a member of the general public (uncontrolled exposure), you must ensure the RF levels don't exceed the uncontrolled MPE limits, which are stricter than controlled limits. You might need to reduce power, change antenna direction, or increase distance.
FCC Part 97.13Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Controlled MPE limits apply to operators and people who know about the exposure, not to neighbors who are members of the general public.
Option C: Incorrect. The term is 'maximum permissible exposure' (MPE), not 'maximum permissible emission'. And it should be uncontrolled, not controlled.
Option D: Incorrect. Again, it's 'exposure' not 'emission'. The correct answer is uncontrolled MPE limits.
题目解析
The correct answer is B: Ensure signals from your station are less than the uncontrolled maximum permissible exposure (MPE) limits. When evaluating RF exposure levels from your station at a neighbor's home, you must ensure signals are less than the uncontrolled maximum permissible exposure (MPE) limits. Uncontrolled exposure applies to the general public. MPE limits have two categories: controlled (for operators and people who know about the exposure) and uncontrolled (for the general public). At a neighbor's home, the people are members of the general public who don't know about or control the exposure, so uncontrolled limits apply. Uncontrolled limits are stricter (lower) than controlled limits to protect the general public. You must ensure your station's RF exposure at the neighbor's location doesn't exceed these uncontrolled MPE limits. This is a legal requirement under FCC rules.
考试技巧
Neighbor RF exposure = Uncontrolled MPE limits. Remember: When evaluating RF exposure at a neighbor's home, you must ensure signals are less than the uncontrolled MPE limits because neighbors are members of the general public.
记忆口诀
**N**eighbor **R**F **E**xposure = **U**ncontrolled **M**PE (think 'NRE = UMPE')
实际应用示例
You operate a high-power station. Your neighbor's house is 50 feet away. You must evaluate RF exposure at your neighbor's location. Since your neighbor is a member of the general public (uncontrolled exposure), you must ensure the RF levels don't exceed the uncontrolled MPE limits, which are stricter than controlled limits. You might need to reduce power, change antenna direction, or increase distance.
错误选项分析
Option A: Incorrect. Controlled MPE limits apply to operators and people who know about the exposure, not to neighbors who are members of the general public. Option C: Incorrect. The term is 'maximum permissible exposure' (MPE), not 'maximum permissible emission'. And it should be uncontrolled, not controlled. Option D: Incorrect. Again, it's 'exposure' not 'emission'. The correct answer is uncontrolled MPE limits.
知识点
RF exposure, MPE limits, Uncontrolled exposure, General public
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.