Which of the following is characteristic of an inverting linear transponder?
The correct answer is D: All these choices are correct. Characteristics of an inverting linear transponder include: Doppler shift is reduced because the uplink and downlink shifts are in opposite directions, signal position in the band is reversed, and upper sideband on the uplink becomes lower sideband on the downlink, and vice versa. All three are characteristics of inverting transponders. For amateur radio operators, this is important for satellite operation. Understanding this helps when operating through satellites.
Exam Tip
All three are inverting transponder characteristics: Doppler reduction, signal position reversed, sideband inversion. When all listed characteristics apply to inverting linear transponders, 'all of the above' is usually the answer. All are key inverting transponder features.
Memory Aid
"All three are inverting transponder characteristics: Doppler reduction, Signal position reversed, Sideband inversion. Think 'A'll 'I'nverting 'T'ransponder 'C'haracteristics. All three are key features of inverting linear transponders. Important for satellite operation."
Real-World Application
An inverting linear transponder: (1) Doppler shift is reduced because uplink and downlink shifts are in opposite directions, (2) Signal position in the band is reversed (low frequencies become high frequencies), (3) Upper sideband on uplink becomes lower sideband on downlink, and vice versa. All three are characteristics of inverting transponders. This is how inverting transponders work.
Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Signal position reversal and sideband inversion are also characteristics.
Option B: While correct, this is incomplete. Doppler reduction and sideband inversion are also characteristics.
Option C: While correct, this is incomplete. Doppler reduction and signal position reversal are also characteristics.
题目解析
The correct answer is D: All these choices are correct. Characteristics of an inverting linear transponder include: Doppler shift is reduced because the uplink and downlink shifts are in opposite directions, signal position in the band is reversed, and upper sideband on the uplink becomes lower sideband on the downlink, and vice versa. All three are characteristics of inverting transponders. For amateur radio operators, this is important for satellite operation. Understanding this helps when operating through satellites.
考试技巧
All three are inverting transponder characteristics: Doppler reduction, signal position reversed, sideband inversion. When all listed characteristics apply to inverting linear transponders, 'all of the above' is usually the answer. All are key inverting transponder features.
记忆口诀
All three are inverting transponder characteristics: Doppler reduction, Signal position reversed, Sideband inversion. Think 'A'll 'I'nverting 'T'ransponder 'C'haracteristics. All three are key features of inverting linear transponders. Important for satellite operation.
实际应用示例
An inverting linear transponder: (1) Doppler shift is reduced because uplink and downlink shifts are in opposite directions, (2) Signal position in the band is reversed (low frequencies become high frequencies), (3) Upper sideband on uplink becomes lower sideband on downlink, and vice versa. All three are characteristics of inverting transponders. This is how inverting transponders work.
错误选项分析
Option A: While correct, this is incomplete. Signal position reversal and sideband inversion are also characteristics. Option B: While correct, this is incomplete. Doppler reduction and sideband inversion are also characteristics. Option C: While correct, this is incomplete. Doppler reduction and signal position reversal are also characteristics.
知识点
Inverting linear transponder, Doppler shift reduction, Signal position reversed, Sideband inversion
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.