During the ROP initialization on the AN/MPQ-64A3, when will the antenna start rotating?

The antenna of the AN/MPQ-64A3 starts rotating once "OK" is selected during the ROP initialization process. This step is crucial because it indicates that all system checks and readiness criteria have been met, ensuring that the system is functioning properly before it begins its operational activities. Selecting "OK" serves as a confirmation from the operator that the system is prepared to proceed, which is essential for maintaining accuracy and reliability in air defense operations.

The other options do not reference the specific procedural requirement for initiating antenna movement post-initialization. Immediate rotation or resetting power might not guarantee that all systems are ready, and simply authorizing the operator does not provide the necessary confirmation of system readiness. Therefore, the requirement to select "OK" distinguishes the initiation of antenna rotation as being contingent upon successful initialization checks.