Why should effective radiated power (ERP) be limited to a satellite that uses a linear transponder?
The correct answer is B: To avoid reducing the downlink power to all other users. Why effective radiated power (ERP) should be limited to a satellite that uses a linear transponder is to avoid reducing the downlink power to all other users. High ERP from one user reduces power available for others. For amateur radio operators, this is important for satellite operation etiquette. Understanding this helps ensure fair satellite operation.
Exam Tip
Limit ERP to linear transponder = to avoid reducing downlink power to all other users. Think 'L'imit 'E'RP = 'L'ess 'E'go, 'R'espect 'P'eers (share power). High ERP from one user reduces power available for others. Not telemetry errors, not out-of-band, not terrestrial interference - just share power fairly.
Memory Aid
"Limit ERP to linear transponder = to avoid reducing downlink power to all other users. Think 'L'imit 'E'RP = 'S'hare 'P'ower. High ERP from one user reduces power available for others. Important satellite operation etiquette."
Real-World Application
A satellite with a linear transponder: If one user transmits with very high ERP, they consume more of the satellite's limited power, reducing the downlink power available to all other users. By limiting ERP, power is shared fairly among all users. This is why ERP should be limited - to avoid reducing downlink power to all other users.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Preventing errors in satellite telemetry isn't the reason - ERP limitation is to share power fairly. Telemetry errors isn't the reason.
Option C: Incorrect. Preventing out-of-band signals isn't the reason - ERP limitation is to share power fairly. Out-of-band signals isn't the reason.
Option D: Incorrect. Avoiding interference with terrestrial QSOs isn't the reason - ERP limitation is to share satellite power fairly. Terrestrial interference isn't the reason.
题目解析
The correct answer is B: To avoid reducing the downlink power to all other users. Why effective radiated power (ERP) should be limited to a satellite that uses a linear transponder is to avoid reducing the downlink power to all other users. High ERP from one user reduces power available for others. For amateur radio operators, this is important for satellite operation etiquette. Understanding this helps ensure fair satellite operation.
考试技巧
Limit ERP to linear transponder = to avoid reducing downlink power to all other users. Think 'L'imit 'E'RP = 'L'ess 'E'go, 'R'espect 'P'eers (share power). High ERP from one user reduces power available for others. Not telemetry errors, not out-of-band, not terrestrial interference - just share power fairly.
记忆口诀
Limit ERP to linear transponder = to avoid reducing downlink power to all other users. Think 'L'imit 'E'RP = 'S'hare 'P'ower. High ERP from one user reduces power available for others. Important satellite operation etiquette.
实际应用示例
A satellite with a linear transponder: If one user transmits with very high ERP, they consume more of the satellite's limited power, reducing the downlink power available to all other users. By limiting ERP, power is shared fairly among all users. This is why ERP should be limited - to avoid reducing downlink power to all other users.
错误选项分析
Option A: Incorrect. Preventing errors in satellite telemetry isn't the reason - ERP limitation is to share power fairly. Telemetry errors isn't the reason. Option C: Incorrect. Preventing out-of-band signals isn't the reason - ERP limitation is to share power fairly. Out-of-band signals isn't the reason. Option D: Incorrect. Avoiding interference with terrestrial QSOs isn't the reason - ERP limitation is to share satellite power fairly. Terrestrial interference isn't the reason.
知识点
Effective radiated power, ERP, Linear transponder, Downlink power
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.