*Question E1B03:
[97.13] Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?*  

*Correct Answer is  A: 1 mile*  

### AI Response: (may contain errors)  

In the context of FCC regulations, amateur radio operators must ensure that their stations do not cause harmful interference to FCC monitoring facilities. The specific rule that applies here is found in Part 97 of the FCC rules, which states that amateur stations must protect these facilities within a certain distance.

### Explanation:

1. **Correct Answer: 1 mile (Choice A)**
   - The FCC requires that amateur stations protect monitoring facilities from harmful interference within a distance of 1 mile. This is a specific regulation to ensure that the monitoring facilities can operate without interference from nearby amateur radio transmissions.

2. **Why Other Choices Are Incorrect:**
   - **3 miles (Choice B):** This distance is greater than what is required by the FCC. The regulation specifically mentions 1 mile, not 3 miles.
   - **10 miles (Choice C):** This is significantly larger than the required protection distance. The FCC does not mandate a 10-mile protection radius for monitoring facilities.
   - **30 miles (Choice D):** This is much larger than necessary. A 30-mile radius is not practical or required by the FCC for protecting monitoring facilities.

### Key Point:
- **Rule of Thumb:** Always remember that the protection distance for FCC monitoring facilities is 1 mile. This is a specific requirement and is not subject to interpretation or change unless the FCC updates its regulations.

By understanding this rule, amateur radio operators can ensure compliance and avoid causing interference to important FCC operations.