What mode of transmission is commonly used by amateur radio satellites?
The correct answer is D: All these choices are correct. Amateur radio satellites commonly use SSB, FM, and CW/data modes for transmission. Different satellites and different missions use different modes - some use FM for simplicity, some use SSB for efficiency, and some use CW/data for telemetry and digital communications. For amateur radio operators, understanding that satellites use various modes helps when selecting equipment and planning contacts. Most modern satellites support multiple modes, and mode selection depends on the satellite's design and purpose.
Exam Tip
Satellites use all modes: SSB, FM, CW/data. When all listed modes are used by satellites, 'all of the above' is usually the answer. Different satellites use different modes depending on their design and purpose.
Memory Aid
"Satellites use all modes: SSB, FM, CW/data. Think 'S'atellites = 'S'upport 'S'everal modes. Different satellites use different modes - SSB for efficiency, FM for simplicity, CW/data for telemetry."
Real-World Application
Amateur satellites use various modes: FM satellites like AO-91 use FM for voice, SSB satellites use single sideband for efficient weak-signal work, and many satellites use CW/data for telemetry and digital communications. The mode depends on the satellite's design - some support multiple modes, others are dedicated to one mode.
Key Concepts
Why Other Options Are Wrong
Option A (SSB): While correct, this is incomplete. Satellites also use FM and CW/data modes.
Option B (FM): While correct, this is incomplete. Satellites also use SSB and CW/data modes.
Option C (CW/data): While correct, this is incomplete. Satellites also use SSB and FM modes.
题目解析
The correct answer is D: All these choices are correct. Amateur radio satellites commonly use SSB, FM, and CW/data modes for transmission. Different satellites and different missions use different modes - some use FM for simplicity, some use SSB for efficiency, and some use CW/data for telemetry and digital communications. For amateur radio operators, understanding that satellites use various modes helps when selecting equipment and planning contacts. Most modern satellites support multiple modes, and mode selection depends on the satellite's design and purpose.
考试技巧
Satellites use all modes: SSB, FM, CW/data. When all listed modes are used by satellites, 'all of the above' is usually the answer. Different satellites use different modes depending on their design and purpose.
记忆口诀
Satellites use all modes: SSB, FM, CW/data. Think 'S'atellites = 'S'upport 'S'everal modes. Different satellites use different modes - SSB for efficiency, FM for simplicity, CW/data for telemetry.
实际应用示例
Amateur satellites use various modes: FM satellites like AO-91 use FM for voice, SSB satellites use single sideband for efficient weak-signal work, and many satellites use CW/data for telemetry and digital communications. The mode depends on the satellite's design - some support multiple modes, others are dedicated to one mode.
错误选项分析
Option A (SSB): While correct, this is incomplete. Satellites also use FM and CW/data modes. Option B (FM): While correct, this is incomplete. Satellites also use SSB and CW/data modes. Option C (CW/data): While correct, this is incomplete. Satellites also use SSB and FM modes.
知识点
Satellite modes, SSB, FM, CW/data
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.