Encyclopedia Astronautica
MACSAT


American military communications satellite. 2 launches, 1990.05.09 (Macsat 1; M-1) and (Macsat 2; M-2).

The two Multiple Access Communications Satellites were third generation DSI digital communications satellites designed to demonstrate tactical UHF voice, data, fax and video store and forward capabilities for the U. S. military. The gravity gradient boom on one spacecraft apparently failed to deploy. The other spacecraft was used during Operation Desert Storm for message relay to and from military troops in the Gulf region.

The spacecraft was gravity gradient stabilized (approx.5 degrees control) using a 9+ meter boom and 2.3 kg tip mass. Damping was achieved via hystersis rods. A Z-coil was used to invert the spacecraft should it stabilize upside down. Dual digital processors provided redundancy and were provided with 2.4 to 16 megabytes of data storage. The 16 sided cylindrical structure had body mounted solar cells which provided 10 to 17 watts of orbit average power. Redundant NiCd batteries provided 150 Whr capacity. The payload included two digitally tunable 10 watt transmitters, a 65 watt high power auxiliary receiver for spacecraft command and hardware reconfiguration, and two antenna systems. This equipment was used to conduct store and forward communications demonstrations.

AKA: Multiple Access Communications Satellites.
Gross mass: 68 kg (149 lb).
Height: 0.36 m (1.17 ft).
First Launch: 1990.05.09.
Number: 2 .

More... - Chronology...


Associated Countries
See also
  • Scout Solid-fuel, light payload, lower-cost launch vehicle developed by the Air Force and NASA in the late 1950's and used in a variety of configurations over thirty years. Launched from Cape Canaveral, Vandenberg, Wallops Island, and from Italy's equatorial San Marco platform off Kenya. Italy studied but did not develop subsequent upgraded versions. More...

Associated Launch Vehicles
  • Scout American all-solid orbital launch vehicle. Solid-fuel, light payload, lower-cost launch vehicle developed by the Air Force and NASA in the late 1950's and used in a variety of configurations over thirty years. Launched from Cape Canaveral, Vandenberg, Wallops Island, and from Italy's equatorial San Marco platform off Kenya. Italy studied but did not develop subsequent upgraded versions. More...
  • Scout G American all-solid orbital launch vehicle. Four stage vehicle consisting of 1 x Algol 3A + 1 x Castor 2 + 1 x Antares 3 + 1 x Star 20 More...

Associated Manufacturers and Agencies
  • DARPA American agency overseeing development of rockets and spacecraft. Defense Advanced Research Projects Agency (formerly ARPA), USA. More...
  • CTA American manufacturer of spacecraft. CTA, Inc. , Virginia, Virginia, Virginia, USA More...

Bibliography
  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: here.
  • McDowell, Jonathan, Launch Log, October 1998. Web Address when accessed: here.

Associated Launch Sites
  • Vandenberg Vandenberg Air Force Base is located on the Central Coast of California about 240 km northwest of Los Angeles. It is used for launches of unmanned government and commercial satellites into polar orbit and intercontinental ballistic missile test launches toward the Kwajalein Atoll. More...
  • Vandenberg SLC5 Scout launch complex. Dedicated Scout launch pad, used during the life of that vehicle from 1962 to 1994. More...

MACSAT Chronology


1990 May 9 - . 17:50 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC5. LV Family: Scout. Launch Vehicle: Scout G. LV Configuration: Scout G-1 S212C.
  • Macsat 1; M-1 - . Payload: MacSat 1. Mass: 68 kg (149 lb). Nation: USA. Agency: DARPA. Class: Communications. Type: Military communications satellite. Spacecraft: Macsat. USAF Sat Cat: 20607 . COSPAR: 1990-043A. Apogee: 753 km (467 mi). Perigee: 602 km (374 mi). Inclination: 89.9000 deg. Period: 98.30 min. Summary: Multiple Access Communications Satellite; global store and forward communications. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B)..
  • Macsat 2; M-2 - . Payload: MacSat 2. Mass: 68 kg (149 lb). Nation: USA. Agency: DARPA. Class: Communications. Type: Civilian communications satellite. Spacecraft: Macsat. USAF Sat Cat: 20608 . COSPAR: 1990-043B. Apogee: 749 km (465 mi). Perigee: 600 km (370 mi). Inclination: 89.9000 deg. Period: 98.30 min. Summary: Multiple Access Communications Satellite; global store and forward communications. Spacecraft engaged in research and exploration of the upper atmosphere or outer space (US Cat B)..

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