What is the national calling frequency for FM simplex operations in the 2 meter band?

The national calling frequency for FM simplex operations in the 2 meter band is recognized as 146.520 MHz. This frequency serves as a common calling channel for amateur radio operators, allowing them to establish initial contact before moving to another frequency for extended conversations.

Using 146.520 MHz is particularly important in emergency communications and for operators seeking to make new contacts. It facilitates coordination and helps to avoid interference that could occur if operators randomly selected frequencies. This practice is crucial for maintaining an organized communication environment among amateur radio operators.

The other frequencies listed, while relevant in other contexts – such as 145.000 MHz being used for specific repeater outputs or 446.000 MHz typically used for the 70 cm band in T-band operations – do not serve the same purpose for national FM simplex calling on the 2 meter band. Therefore, 146.520 MHz is the correct answer for this specific function.