Comstar 4

USA

Spacecraft n°:

USA satellite n°:

Also called: Comstar 1D

Launch data:

Designation 12309 / 81018A
Launch date 21 Feb 1981
Launch site CC, LC-36A
Launch vehicleAtlas-SLV3D Centaur-D (AC-42)
MissionCommunications
Geostationary orbit 76°W, inclined

Used for telephony and data transmission, especially to and from ships in U.S. coastal waters and the Caribbean region.

Specifications


Prime contractor Hughes
Platform HS-351
Mass at launch 1516 kg
Mass in orbit 911 kg
Dimension 2.38 m diameter x 6.34 m height
Stabilization Spin stabilized (56 rpm)
DC power BOL:570 W
Design lifetime 10 years

Equipped with two Ka-band beacons for propagation research (19 and 28.6 GHz).

C-band


Main transponders 24
Backup transponders  
Power Horizontal: 5 W (TWTA)
Vertical: 5.5 W (TWTA)
Bandwidth 36 MHz
Coverage CONUS
EIRP max 33 dBW
Polarization linear H/V

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