What do the letters in a satellite’s mode designator specify?
The correct answer is D: The uplink and downlink frequency ranges. What the letters in a satellite's mode designator specify is the uplink and downlink frequency ranges. Mode letters indicate which frequency ranges are used. For amateur radio operators, this is important for satellite operation. Understanding this helps when operating through satellites.
Exam Tip
Mode designator letters = uplink and downlink frequency ranges. Think 'M'ode 'L'etters = 'M'odulation 'L'ocations (frequency ranges). Mode letters indicate which frequency ranges are used for uplink and downlink. Not power limits, not control station location, not polarization - just frequency ranges.
Memory Aid
"Mode designator letters = uplink and downlink frequency ranges. Think 'M'ode 'L'etters = 'F'requency 'R'anges. Mode letters indicate which frequency ranges are used for uplink and downlink. Important for satellite operation."
Real-World Application
The letters in a satellite's mode designator: They specify the uplink and downlink frequency ranges. For example, Mode A might use 2m (VHF) for uplink and 10m (HF) for downlink. The letters indicate which frequency ranges are used. This is what mode letters specify - uplink and downlink frequency ranges.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Power limits for uplink and downlink aren't specified by mode letters - mode letters specify frequency ranges. Power limits aren't mode letters.
Option B: Incorrect. Location of ground control station isn't specified by mode letters - mode letters specify frequency ranges. Control station location isn't mode letters.
Option C: Incorrect. Polarization of uplink and downlink signals isn't specified by mode letters - mode letters specify frequency ranges. Polarization isn't mode letters.
题目解析
The correct answer is D: The uplink and downlink frequency ranges. What the letters in a satellite's mode designator specify is the uplink and downlink frequency ranges. Mode letters indicate which frequency ranges are used. For amateur radio operators, this is important for satellite operation. Understanding this helps when operating through satellites.
考试技巧
Mode designator letters = uplink and downlink frequency ranges. Think 'M'ode 'L'etters = 'M'odulation 'L'ocations (frequency ranges). Mode letters indicate which frequency ranges are used for uplink and downlink. Not power limits, not control station location, not polarization - just frequency ranges.
记忆口诀
Mode designator letters = uplink and downlink frequency ranges. Think 'M'ode 'L'etters = 'F'requency 'R'anges. Mode letters indicate which frequency ranges are used for uplink and downlink. Important for satellite operation.
实际应用示例
The letters in a satellite's mode designator: They specify the uplink and downlink frequency ranges. For example, Mode A might use 2m (VHF) for uplink and 10m (HF) for downlink. The letters indicate which frequency ranges are used. This is what mode letters specify - uplink and downlink frequency ranges.
错误选项分析
Option A: Incorrect. Power limits for uplink and downlink aren't specified by mode letters - mode letters specify frequency ranges. Power limits aren't mode letters. Option B: Incorrect. Location of ground control station isn't specified by mode letters - mode letters specify frequency ranges. Control station location isn't mode letters. Option C: Incorrect. Polarization of uplink and downlink signals isn't specified by mode letters - mode letters specify frequency ranges. Polarization isn't mode letters.
知识点
Satellite mode designator, Letters, Uplink frequency ranges, Downlink frequency ranges
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.