What function does pressing HV ON perform in the AN/MPQ-64A3?

Pressing HV ON in the AN/MPQ-64A3 activates the high voltage necessary for the transmitter to operate efficiently. This function is critical because the transmitter must be calibrated and ready to emit signals for radar operation. Proper calibration ensures that the radar can accurately detect and track aerial threats, which is central to air defense operations.

Though other functions, such as radome adjustment, antenna alignment, and power resets, may also be involved in the overall operation and readiness of the radar system, they do not pertain specifically to the immediate preparation and activation of the transmitter. Only through proper high voltage activation can the radar begin its specific data gathering and tracking processes, making this function essential to the system’s operational capabilities.