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

146.520 MHz is the universally recognized national calling frequency for FM simplex operations in the 2-meter band in the United States. A calling frequency is a designated place for operators to establish initial contact before moving to a different frequency to carry on their conversation, which keeps the calling frequency clear for others to use. It is important not to confuse this with frequencies from other bands or modes. For example, 446.000 MHz is the national FM simplex calling frequency for the 70 cm band, while 432.100 MHz is the calling frequency for SSB (Single Sideband) and CW (Morse code) on 70 cm. Memorizing 146.520 MHz is highly recommended for Technician class operators. It is a vital frequency to program into your radio for direct, station-to-station communication while traveling or during public service events.