ada4dThe Air Defense Alerting Device (ADAD) is a passive infrared-based sensor system desned for short-range air defense (SHORAD) applications. ADAD is widely used toThe RU-ADA4D from RDL is a four-channel stereo audio distribution amplifier with input and output gain adjustments and input-level metering. The module may be operated in mono to provide up to eht distributed mono snals.