*Question E2A02:
Which of the following is characteristic of an inverting linear transponder?*  

*Correct Answer is  D: All these choices are correct*  

### AI Response: (may contain errors)  

An inverting linear transponder is a type of satellite communication system that processes signals in a specific way. Let's break down the characteristics mentioned in the question.

### Correct Answer: D - All these choices are correct

1. **Doppler Shift**:  
   - In an inverting transponder, the uplink and downlink frequencies are affected by the Doppler effect in opposite directions. This means that as the satellite moves, the frequency of the signal received (uplink) and the frequency of the signal transmitted back (downlink) will shift in opposite directions, effectively reducing the overall Doppler shift experienced by the user.

2. **Signal Position in the Band**:  
   - The signal position is indeed reversed in an inverting transponder. If a signal is transmitted at a certain frequency on the uplink, it will be received at a different frequency on the downlink, effectively mirroring its position in the frequency band.

3. **Sideband Conversion**:  
   - The sideband characteristics are also inverted. If you use upper sideband (USB) for the uplink, it will be converted to lower sideband (LSB) for the downlink, and vice versa. This is a fundamental property of inverting transponders.

### Why the Other Choices Are Incorrect

- **Choice A**: This choice is actually correct, as explained above. The Doppler shift is indeed reduced due to the opposite shifts on uplink and downlink.

- **Choice B**: This choice is also correct. The signal position in the band is reversed in an inverting transponder.

- **Choice C**: This choice is correct as well. The upper sideband on the uplink becomes lower sideband on the downlink, and vice versa.

Since all the individual statements (A, B, and C) are correct, the answer D, which states that all these choices are correct, is the right answer.

### Summary
In summary, an inverting linear transponder has the following characteristics:
- Doppler shift is reduced due to opposite frequency shifts.
- Signal positions are reversed in the frequency band.
- Sidebands are inverted (USB to LSB and vice versa).

Understanding these properties is crucial for operating and communicating effectively via satellite systems in amateur radio.