*Question E2A07:
Which of the following types of signals can be relayed through a linear transponder?*  

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

### AI Response: (may contain errors)  

To understand why the correct answer is "All these choices are correct," let's break down the types of signals and how they interact with a linear transponder.

### Explanation of the Correct Answer:
- **Linear Transponder**: A linear transponder is designed to amplify and relay signals without distorting their waveform. This means it can handle a variety of modulation types effectively.
- **Types of Signals**: 
  - **FM (Frequency Modulation)**: Used in voice communications.
  - **CW (Continuous Wave)**: Used for Morse code.
  - **SSB (Single Sideband)**: A form of amplitude modulation used for voice.
  - **SSTV (Slow Scan Television)**: Transmits still images.
  - **PSK (Phase Shift Keying)**: A digital modulation scheme.
  - **Packet**: A method of digital communication that sends data in packets.

Since a linear transponder can relay all these types of signals without distortion, the correct answer is indeed "All these choices are correct."

### Why the Other Choices Are Incorrect:
- **Choice A (FM and CW)**: While both FM and CW can be relayed, this option does not encompass all the types of signals that a linear transponder can handle.
- **Choice B (SSB and SSTV)**: This choice is also limited as it only includes two types of signals, missing out on others like PSK and packet.
- **Choice C (PSK and packet)**: Similar to the previous choices, this option is incomplete as it excludes FM, CW, SSB, and SSTV.

### Summary:
- A linear transponder can relay a wide range of modulation types, making it versatile for various communication methods.
- Therefore, the correct answer is "All these choices are correct" because it includes all the mentioned signal types.

### Useful Rule of Thumb:
- When studying for the Extra Class exam, remember that linear transponders are capable of handling multiple modulation types without distortion, which is key to understanding their functionality.