*Question T2A02:
What is the national calling frequency for FM simplex operations in the 2 meter band?*  

*Correct Answer is  A: 146.520 MHz*  

### AI Response: (may contain errors)  

The national calling frequency for FM simplex operations in the 2 meter band is:

**Correct Answer: 146.520 MHz**

### Explanation:

1. **Why the correct answer is correct:**
   - The frequency **146.520 MHz** is designated as the national calling frequency for FM simplex operations in the 2 meter amateur radio band. This frequency is widely recognized and used by amateur radio operators to initiate contacts and find others to communicate with.

2. **Why the other choices are incorrect:**
   - **145.000 MHz**: This frequency is not designated as a national calling frequency. It is often used for repeater inputs or other specific purposes, but not for simplex calling.
   - **432.100 MHz**: This frequency is in the 70 cm band, which is not applicable to the 2 meter band calling frequency. It is used for various operations, but not as a national calling frequency for FM simplex.
   - **446.000 MHz**: This frequency is also in the 70 cm band and is commonly used for simplex operations, but it is not the national calling frequency for the 2 meter band.

### Useful Rules of Thumb:
- The 2 meter band (144-148 MHz) is popular for local communications, and **146.520 MHz** is the go-to frequency for initiating simplex contacts.
- Always check band plans and local regulations to ensure proper frequency usage and to avoid interference with other operators.