DSP 3 series

Prime contractor TRW
Mass at launch around 2200 kg
Mass in orbit  
Dimension 6.7 m diameter x 10 m long (deployed)
Solar array  
Stabilization spin stabilized
DC power 1485 W
Design lifetime  

Probably downlinks in S- and X-band (around 2237.48 MHz). Has a wide field infrared telescope to provide real-time warning of missile launches (6000 infrared detectors)

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