Which component requires calibration during operational checks of the AN/MPQ-64A3?

The transmitter is a critical component of the AN/MPQ-64A3 that requires calibration during operational checks. Calibration of the transmitter ensures that it operates within specified parameters, producing accurate data and maintaining effective communication with other systems. Proper calibration supports the overall performance and reliability of the radar system, allowing it to effectively detect and track aerial threats by sending out precision signals.

Calibrating the transmitter helps to minimize any discrepancies that could affect the radar's range and accuracy. If the transmitter’s output is not calibrated correctly, it could lead to failures in target identification, tracking, and engagement, ultimately affecting mission success.

While other components like the antenna system, signal processing unit, and control panel are essential in the operational readiness of the AN/MPQ-64A3, they do not specifically require calibration in the same way as the transmitter does during operational checks. Instead, they may involve set-up, configuration, or routine checks that do not necessitate recalibration under standard operating conditions.