What is the FCC Part 97 definition of a space station?
The correct answer is C: An amateur station located more than 50 km above Earth's surface. This precise definition is found in FCC Part 97.3(a)(41). The 50-kilometer threshold distinguishes space stations from terrestrial amateur stations and is based on the internationally recognized boundary of space.
The 50 km (approximately 31 miles) altitude is significant because it represents the point where atmospheric effects on radio propagation change dramatically. Above this altitude, stations operate in what is essentially space, where different propagation characteristics apply. This definition covers amateur satellites, high-altitude balloons (if they exceed 50 km), and any other amateur station operating above this altitude. The definition focuses on altitude, not whether the station is manned or what it's used for - any amateur station above 50 km is a space station by definition.
Exam Tip
Space station = 50 km up. Remember the number: 50 kilometers. Any amateur station above 50 km is a space station, regardless of what it does or whether it's manned.
Memory Aid
"**S**pace **S**tation = **S**ixty kilometers? **S**tart at **5**0! (think 'S5' = Space Station 50 km)"
Real-World Application
AMSAT (Radio Amateur Satellite Corporation) operates several amateur satellites like AO-91 and FO-29 that orbit Earth at altitudes of 400-800 km. These are space stations because they're amateur stations located well above the 50 km threshold. When you use your handheld radio to communicate through one of these satellites, you're using a space station as a relay, but your ground station remains a terrestrial station.
FCC Part 97.3(a)(41)Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Not all satellites orbiting Earth are amateur space stations. Many satellites are commercial, military, or government-owned and are not part of the amateur radio service.
Option B: Incorrect. Whether a satellite is manned is irrelevant to the definition. The key factor is altitude (more than 50 km) and that it's an amateur station.
Option D: Incorrect. Using amateur satellites for relay doesn't make your ground station a space station. The space station is the satellite itself, not the ground station using it.
题目解析
The correct answer is C: An amateur station located more than 50 km above Earth's surface. This precise definition is found in FCC Part 97.3(a)(41). The 50-kilometer threshold distinguishes space stations from terrestrial amateur stations and is based on the internationally recognized boundary of space. The 50 km (approximately 31 miles) altitude is significant because it represents the point where atmospheric effects on radio propagation change dramatically. Above this altitude, stations operate in what is essentially space, where different propagation characteristics apply. This definition covers amateur satellites, high-altitude balloons (if they exceed 50 km), and any other amateur station operating above this altitude. The definition focuses on altitude, not whether the station is manned or what it's used for - any amateur station above 50 km is a space station by definition.
考试技巧
Space station = 50 km up. Remember the number: 50 kilometers. Any amateur station above 50 km is a space station, regardless of what it does or whether it's manned.
记忆口诀
**S**pace **S**tation = **S**ixty kilometers? **S**tart at **5**0! (think 'S5' = Space Station 50 km)
实际应用示例
AMSAT (Radio Amateur Satellite Corporation) operates several amateur satellites like AO-91 and FO-29 that orbit Earth at altitudes of 400-800 km. These are space stations because they're amateur stations located well above the 50 km threshold. When you use your handheld radio to communicate through one of these satellites, you're using a space station as a relay, but your ground station remains a terrestrial station.
错误选项分析
Option A: Incorrect. Not all satellites orbiting Earth are amateur space stations. Many satellites are commercial, military, or government-owned and are not part of the amateur radio service. Option B: Incorrect. Whether a satellite is manned is irrelevant to the definition. The key factor is altitude (more than 50 km) and that it's an amateur station. Option D: Incorrect. Using amateur satellites for relay doesn't make your ground station a space station. The space station is the satellite itself, not the ground station using it.
知识点
FCC Part 97.3(a)(41), Space station definition, 50 km altitude threshold, Amateur satellites
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.