DSCS 3-F9

USA


Spacecraft n:

USA satellite n:

Defense Satellite Communications System
Also called USA 113 (code B7)

Launch data:

Designation 23628 / 95038A
Launch date31 Jul 1995 - 23:30 UT
Launch site CC, LC-36A
Launch vehicle  Atlas-2A (AC-118)
MissionMilitary: Communications
Geostationary orbit:
Perigee / Apogee 35784 x 35784 km
Eccentricity 0.00E+00
Inclination 0 deg
Period 1436.1 min


Spacecraft data:

Prime contractor  Lockheed Martin (former GE Astro Space)
Platform  
Operator US Air Force
Mass at launch  1156 kg
Mass in orbit 884 kg
Basic shape  
Dimension (m) 2.07 x 1.93 x 1.96m (LxWxD)
Solar array  11.4m
Stabilization  3 axis
DC power  BOL: 1240 W
EOL; 837 W
three 35 AH NiCd batteries
Telemetry S- and X-band
Beacon 7600.0 and 7604.7 MHz
Design lifetime  10 yrs - still active

Location:

DatePositionRemarks
 April 2010  52.40° W 

Features fixed (multiple-beam) antennas and a steerable high power antenna.

X-band:

Main transponders
Backup two 40 W and two 10 W amplifiers
Power channels 1 & 2: 40 W (TWTA)
channels 3 to 6: 10 W (SSPA)
Coverage and EIRP max 2 Global beams: 29 dBW
2 Spot beams: 34 dBW
Gimballed dish: 44 dBW

Transponder frequency chart (GHz)

Channel Bandwidth (MHz) Frequency
1 50
2 75
3 85
4 85
5 60
6 50

Frequencies are probably in 250 MHz, S-band and X-band range. In X-band, uplink in the 7.9-8.025 GHz, 8.025-8.400 GHz, downlink in 7.250-7.750 GHz
Super High Frequency (SHF) for U.S. government and military; sophisticated survivability enhancement; worldwide, longhaul coverage; X-band.

Ref: #7, #15, #226 - update: 19.05.2010