What must be done first when setting up the AN/PRC-117F?

When setting up the AN/PRC-117F radio, the first step is to attach the batteries and battery box. This is essential because without power, the radio cannot function, meaning that all subsequent steps would be pointless until the device is operational. Once the batteries are secured, the radio can power up, allowing for testing, frequency setting, and antenna connection to take place. Properly securing the power source ensures that the radio is ready to communicate effectively, making it a foundational step in the setup process.