*Question T0A07:
Where should a lightning arrester be installed in a coaxial feed line?*  

*Correct Answer is  D: On a grounded panel near where feed lines enter the building*  

### AI Response: (may contain errors)  

To understand where a lightning arrester should be installed in a coaxial feed line, let's analyze the options:

### Correct Answer: 
**D: On a grounded panel near where feed lines enter the building**

- **Reasoning**: 
  - Installing the lightning arrester at this location helps protect the entire system from lightning strikes. It diverts the high voltage surge to ground before it can enter the building and damage equipment. This is crucial because the feed lines are often the most direct path for lightning to reach your equipment.

### Why the Other Choices are Incorrect:

- **A: At the output connector of a transceiver**  
  - **Reason**: Placing the arrester here does not provide adequate protection. If lightning strikes, the surge can still travel through the coaxial cable and damage the transceiver before the arrester can act.

- **B: At the antenna feed point**  
  - **Reason**: While this location might seem logical, it is not optimal. If the arrester is at the antenna, the surge can still travel down the feed line to the building, potentially causing damage before the arrester can redirect the surge to ground.

- **C: At the AC power service panel**  
  - **Reason**: This location is not effective for protecting the coaxial feed line. The AC panel is meant for electrical surges, not RF feed lines. Lightning surges can still enter through the coaxial cable and damage equipment before reaching the panel.

### Summary:
- The best practice is to install the lightning arrester on a grounded panel near where the feed lines enter the building. This setup maximizes protection by ensuring that any surge is directed to ground before it can affect your radio equipment. 

### Rule of Thumb:
- Always ground your equipment and install surge protection as close to the point of entry as possible to minimize the risk of damage from lightning strikes.