E2A02: Characteristic of an inverting linear transponder

Q: Which of the following is characteristic of an inverting linear transponder?

The correct answer is D: All these choices are correct. 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.

Updated: Dec 9, 2025 | Source: 2024-2028 Question Pool | Topic: E2A

E2A02E2A

Which of the following is characteristic of an inverting linear transponder?

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Deep Dive: E2A02

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.

Why Other Answers 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.

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 Example

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.

Source & Coverage

Question Pool: 2024-2028 Question Pool

Subelement: E2A

Reference: 2024-2028 Question Pool · E2 - Operating Procedures

Key Concepts

Inverting linear transponder Doppler shift reduction Signal position reversed Sideband inversion

Verified Content

Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E2A topic.