DSCS III
Defense Satellite Communications System III
Part of the DSCS (Defense Satellite Communications System) program 

DSCS provides secure voice and data communications for the US military. The contract is managed by the DCA (Defense Communications Agency) for the USAF. Recurring cost is quoted as $160 million in Aviation Week (8/7/95). 

Spacecraft
3-axis stabilization (0.1 deg control in pitch, roll) using reaction wheels, earth and sun sensors. Two articulated solar arrays produce 1240 W (BOL), NiCd batteries with 105 AHr, 28V bus. S-Band (SGLS) and X-Band command and telemetry links. Blowdown hydrazine propulsion system with 16 x 1-lbf thrusters. 

Payload
Six SHF channels. Ch1: 50 MHz, 40 W; Ch2: 75 MHz, 40 W; Ch3: 85 MHz, 10 W; Ch4: 85 MHz, 10 W; Ch5: 60 MHz, 10 W; Ch6: 50 MHz, 10 W. Full Earth and narrow coverage capabilities. Receive antennas: two Earth coverage horns, one steerable 61-beam nulling lens. Transmit antennas: two Earth coverage horns, two steerable 19-beam wave guide lens, one high gain parabolic gimballed dish. 
 
Country of Origin United States
Customer/User USAF
Manufacturer(s) GE Astro Space
Size 2.1 x 1.9 x 2.0 m bus, 11.5 m solar array span
Orbit Geosynchronous
Design Life 10 years

 

Launch Facts
 Name   Int'l Desig.   Date   Site   Vehicle   Orbit   Mass(kg) 
    Notes
 DSCS 3 F1   1982-106B   10/30/82   ESMC   Titan 34D IUS   GEO   
    Defense Satellite Communications System 
 DSCS 3 F2 (USA 11)   1985-092C ?   10/3/85   ESMC   STS 51J   GEO   
    Defense Satellite Communications System; released from STS 51J 10/4/85; boosted into orbit with DSCS 3 F3 on single IUS booster 
 DSCS 3 F3 (USA 12)   1985-092D ?   10/3/85   ESMC   STS 51J   GEO   
    Defense Satellite Communications System; released from STS 51J 10/4/85; boosted into orbit with DSCS 3 F2 on single IUS booster 
 DSCS 3 F4 (USA 44)   1989-069B   9/4/89   ESMC   Titan 34D   GEO   
    Defense Satellite Communications System 
 DSCS 3 F7 (USA 93)   1993-046A   7/19/93   ESMC   Atlas 2   GEO   2615 
    Defense Satellite Communications System 
 DSCS 3 F8 (USA 97)   1993-074A   11/28/93   ESMC   Atlas 2   GEO   2615 
    Defense Satellite Communications System 
 DSCS 3 F9 (USA 113)   1995-038A   7/31/95   ESMC   Atlas 2A   GEO   2610 
    Defense Satellite Communications System 

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