At what frequency does the Sentinel radar receive its reply?

The Sentinel radar operates at a frequency of 1090 MHz to receive its replies. This frequency is specifically used for secondary surveillance radar (SSR), which communicates with aircraft transponders. The communication at this frequency allows the radar system to effectively track and identify friendly aircraft by receiving their responses to interrogation pulses sent at the 1030 MHz frequency. The 1090 MHz frequency is crucial for ensuring accurate data collection in air defense operations, particularly for the identification and situational awareness needed in battle management. Understanding this frequency connection is essential for personnel operating in air defense environments, as it enables clearer operational goals and aids in the appropriate coordination of air assets.