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Aviation History
1985
1985 - 0106.PDF
INTERNATIONAL SATELLITE DIRECTORY Intelsat V/VA continued Payload Intelsat V 21 6/GHz transponders 6 14/llGHz transponders Intelsat VA 32 6/4GHz transponders 6 14/llGHz transponders Owner Intelsat Manufacturer Ford Aerospace Orbit Geostationary Launch/location/status Intelsat V-Fl May 1981 Atlas-Centaur/57°E F2 Dec 1980 Atlas-Centaur/325-5°E F3 Dec 1981 Atlas-Centaur/335-5°E F4 Mar 1982 Atlas-Centaur/332-5°E F5 Sep 1982 Atlas-Centaur/63°E F6 May 1983 Atlas-Centaur/341 • 5°E F7 Oct 1983 Atlas-Centaur/60°E F8 Mar 1984 Ariane/307°E F9 Jun 1984 Atlas-Centaur/lost on launch Intelsat VA-F10 Jan 1985 Atlas-Centaur/lost on launch Fll Apr 1985 Atlas-Centaur/lost on launch F12 Jul 1985 Atlas-Centaur/lost on launch F13 Sep or Nov 1985 Ariane F14 Jan-Feb 1986 Ariane F15 April or May 1986 Ariane Stabilisation 3 -axis Power (end of life) 1 • 2kW Weight (at launch) 1,930kg Design life 7 years Cost $235m (1976)—7 Intelsat Vs Remarks Intelsat V-F5 to F8 carry a maritime communication subsystem (MCS) leased to Inmarsat. Intelsat VA provides 25 per cent more capacity through additional transponders and two fully steerable 4GHz spot beams. Intelsat VI Intelsat's future generation of commu nications satellites will be the largest ever built, able to carry 33,000 two-way tele phone calls, double the capacity of Intelsat VA. The initial $700 million contract placed in 1982 covers develop ment of Intelsat VI and production of the first five, with options for up to 11 more. Hughes expects nine of the options to be exercised taking the value of the contract to some $1,300 million. Payload 38 6/4GHz transponders 10 14/llGHz transponders Owner Intelsat Manufacturer Hughes Aircraft Orbit Geostationary Launch Intelsat VI-FI Jul 1986 Shuttle F2 Jan 1987 Shuttle F3 Jun 1987 Shuttle or Dec 1987 Ariane 4 F4 Oct 1987 Shuttle or Ariane 4 F5 Apr 1989 Shuttle Stabilisation Spin Power (end of life) 2 • 2kW Weight (at launch) 3,920kg (Ariane 4) 4,026kg (Shuttle) Design life 10 years Cost $700 million (1982)—five craft plus options Remarks Intelsat VI design is scaled-up from the HS376 bus. Deployment from Shuttle will be frisbee-style, as pioneered on the HS381 Leasat widebody satellite. Shuttle launch requires a perigee boost motor. The C-band (6/4GHz) payload comprises two hemispherical, and four spot beams plus Earth coverage antennas. The Ku-band (14/llGHz) payload comprises two steerable spot beams. Automatic station keeping has recently been added to the design. Intelsat VI will be the first to use satellite-switched time- division multiple access to connect the circuits. Marecs Marecs satellites are leased by the European Space Agency to the International Maritime Satellite Organisation (Inmarsat). With 41 member countries, Inmarsat provides telecommunications services to the ship ping and offshore industries. Inmarsat's first-generation network comprises six satellites. In addition to Marecs A and B2, Inmarsat leases maritime communication subsystems on four Intelsat V craft. Inmarsat is now evaluating pro posals for its next generation of up to nine satellites to be available from 1988, providing increased capacity (125 simultaneous telephone calls compared with 50 for Marecs). Two teams are competing, led by British Aerospace / Hughes Aircraft / Matra, and Marconi Space Systems/Ford Intelsat VI, built fry Hughes Aircraft leading an international team, will be the world's largest communications satellite FLIGHT International, 12 January 19&5
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