*Question T0C09:
How can you make sure your station stays in compliance with RF safety regulations?*  

*Correct Answer is  B: By re-evaluating the station whenever an item in the transmitter or antenna system is changed*  

### AI Response: (may contain errors)  

To ensure your station stays in compliance with RF safety regulations, the correct answer is:

**B: By re-evaluating the station whenever an item in the transmitter or antenna system is changed.**

### Explanation of the Correct Answer:
- **Re-evaluating your station** is crucial because any changes to the transmitter or antenna can affect the RF exposure levels. This includes modifications to power output, antenna type, or placement. Regular evaluations help ensure that your station remains within the safe limits set by the FCC.

### Why the Other Choices are Incorrect:
- **A: By informing the FCC of any changes made in your station**  
  - While it's important to keep the FCC informed about significant changes (like a change in address or license status), simply informing them does not ensure compliance with RF safety regulations. Compliance is primarily your responsibility as the operator.

- **C: By making sure your antennas have low SWR**  
  - Low Standing Wave Ratio (SWR) is important for efficient power transfer and to prevent damage to your equipment, but it does not directly relate to RF safety compliance. A low SWR does not guarantee that RF exposure levels are within safe limits.

- **D: All these choices are correct**  
  - Since A and C do not directly ensure compliance with RF safety regulations, this choice is incorrect.

### Useful Rules of Thumb:
- **RF Exposure Evaluation**: Use the FCC's guidelines to evaluate RF exposure. This often involves calculating the power density at various distances from the antenna.
- **General Safety Limits**: Familiarize yourself with the limits set by the FCC for human exposure to RF energy, which can be found in the FCC OET Bulletin 65.

By focusing on re-evaluating your station after any changes, you can maintain compliance with RF safety regulations effectively.