What is the first step when operating the AN/PRC-150?

When operating the AN/PRC-150, the first step is to turn on the radio and conduct a test to ensure it is functioning properly. This initial action is crucial because it allows the operator to confirm that the equipment is powered and operational before proceeding with any further actions like changing batteries, activating signals, or adjusting volume. Testing the radio right after turning it on helps the user catch any potential issues with the equipment, ensuring reliable communication in a combat or operational scenario. This step sets the foundation for effective use of the radio, which is vital for maintaining communication in the field.