*Question E1D11:
[97.209] Which amateur stations are eligible to operate as Earth stations?*  

*Correct Answer is  D: Any amateur station, subject to the privileges of the class of operator license held by the control operator*  

### AI Response: (may contain errors)  

To understand which amateur stations are eligible to operate as Earth stations, let's break down the correct answer and the reasoning behind it.

### Correct Answer: 
**D: Any amateur station, subject to the privileges of the class of operator license held by the control operator.**

#### Explanation:
- **Eligibility**: All amateur stations can operate as Earth stations as long as they adhere to the privileges associated with their specific license class. This means that a technician, general, advanced, or extra class operator can operate an Earth station, but they must follow the rules and limitations of their respective license.
- **Control Operator**: The control operator is responsible for the station's operation and must hold a valid amateur radio license. The privileges of the control operator determine what frequencies and modes can be used.

### Why the Other Choices are Incorrect:
- **A: Any amateur licensee who has successfully completed the AMSAT space communications course**  
  - **Incorrect**: Completing a course does not grant additional privileges. The eligibility to operate as an Earth station is based on the class of license, not on course completion.

- **B: Only those of General, Advanced or Amateur Extra class operators**  
  - **Incorrect**: This choice excludes Technician class operators, who are also eligible to operate Earth stations within their license privileges.

- **C: Only those of Amateur Extra class operators**  
  - **Incorrect**: This choice is too restrictive. While Extra class operators have the most privileges, all classes of amateur operators can operate Earth stations as long as they comply with their license privileges.

### Summary:
- Any amateur station can operate as an Earth station, provided the control operator holds a valid license and operates within the privileges of that license class. 

This understanding is crucial for the Extra Class exam, as it emphasizes the importance of license privileges and the role of the control operator in amateur radio operations.