How is an upload signal processed by an inverting linear transponder?
The correct answer is D: The signal is mixed with a local oscillator signal and the difference product is transmitted. How an upload signal is processed by an inverting linear transponder is that the signal is mixed with a local oscillator signal and the difference product is transmitted. Inverting transponders use mixing to invert the signal. For amateur radio operators, this is important for satellite operation. Understanding this helps when operating through satellites.
Exam Tip
Inverting transponder processing = signal mixed with local oscillator, difference product transmitted. Think 'I'nverting 'T'ransponder = 'I'nverts by 'T'ranslating (mixing). Inverting transponders use mixing to invert the signal. Not detection/remodulation, not nonlinear filter, not I/Q processing - just mixing.
Memory Aid
"Inverting transponder processing = signal mixed with local oscillator, difference product transmitted. Think 'I'nverting 'T'ransponder = 'M'ixing. Inverting transponders use mixing to invert the signal. Important for satellite operation."
Real-World Application
An inverting linear transponder processes an upload signal: The signal is mixed with a local oscillator signal, and the difference product (LO - signal) is transmitted. This mixing process inverts the signal - low frequencies become high frequencies, upper sideband becomes lower sideband. This is how inverting transponders work - mixing with local oscillator.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Signal detected and remodulated on reverse sideband isn't how inverting transponders work - they use mixing, not detection/remodulation. Detection/remodulation isn't the process.
Option B: Incorrect. Signal passed through nonlinear filter isn't how inverting transponders work - they use mixing, not nonlinear filtering. Nonlinear filter isn't the process.
Option C: Incorrect. Signal reduced to I and Q components with Q filtered out isn't how inverting transponders work - they use mixing, not I/Q processing. I/Q processing isn't the process.
题目解析
The correct answer is D: The signal is mixed with a local oscillator signal and the difference product is transmitted. How an upload signal is processed by an inverting linear transponder is that the signal is mixed with a local oscillator signal and the difference product is transmitted. Inverting transponders use mixing to invert the signal. For amateur radio operators, this is important for satellite operation. Understanding this helps when operating through satellites.
考试技巧
Inverting transponder processing = signal mixed with local oscillator, difference product transmitted. Think 'I'nverting 'T'ransponder = 'I'nverts by 'T'ranslating (mixing). Inverting transponders use mixing to invert the signal. Not detection/remodulation, not nonlinear filter, not I/Q processing - just mixing.
记忆口诀
Inverting transponder processing = signal mixed with local oscillator, difference product transmitted. Think 'I'nverting 'T'ransponder = 'M'ixing. Inverting transponders use mixing to invert the signal. Important for satellite operation.
实际应用示例
An inverting linear transponder processes an upload signal: The signal is mixed with a local oscillator signal, and the difference product (LO - signal) is transmitted. This mixing process inverts the signal - low frequencies become high frequencies, upper sideband becomes lower sideband. This is how inverting transponders work - mixing with local oscillator.
错误选项分析
Option A: Incorrect. Signal detected and remodulated on reverse sideband isn't how inverting transponders work - they use mixing, not detection/remodulation. Detection/remodulation isn't the process. Option B: Incorrect. Signal passed through nonlinear filter isn't how inverting transponders work - they use mixing, not nonlinear filtering. Nonlinear filter isn't the process. Option C: Incorrect. Signal reduced to I and Q components with Q filtered out isn't how inverting transponders work - they use mixing, not I/Q processing. I/Q processing isn't the process.
知识点
Inverting linear transponder, Upload signal processing, Mixed with local oscillator, Difference product
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.