DSP 3 series

Prime contractor	TRW
Platform
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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