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INTERNATIONA L SATELLITE DIRECTOR YV/VA continued

2 1 6 / G H z t r a n sp o n d e r s 6 1 4 / l l G H zt r a n s p o n d e r sIn t e l sa t VA3 2 6 /4 G H z t r a n s p o n d e r s 6 1 4 / l l G H zt r a n s p o n d e r sI n t e l s a t Ford AerospaceGeos ta t iona ryI n t e l s a tV - F l May 1981 At la s -Centaur /57EF 2 Dec 1980 At la s -Centaur /325-5EF 3 Dec 1981 At la s -Centaur /335-5EF 4 Mar 1982 At la s -Centaur /332-5EF 5 Sep 1982 At la s -Centaur /63EF 6 Ma y 1 9 8 3 A t l a s - C e n ta u r /3 4 1 5EF7 Oc t 1983 At la s -Centaur /60EF 8 Mar 1984 Ar iane /30 7EF 9 Jun 1984 At la s -C entaur / lo s t onlaunchI n t e l s a tV A - F 1 0 Jan 1985 At la s -Centaur / los ton launchF l l Apr 1985 At la s -Centaur / los t onl a u n c h

F 1 2 Ju l 1985 At la s -Centa ur / los t onlaunchF 1 3 Sep or Nov 1985 ArianeF 1 4 Jan-Feb 1986 Ar ianeF 1 5 April or May 1986 Ariane3 -axis(end of life) 1 2 kW(a t launch) 1,930kg7 yea r s$235m (1976)7 Inte lsa t VsInte lsa t V-F5 to F8 carry a

mar i t ime communica t ion subsys tem(MCS) leased to Inmarsat . Inte lsa t VAprovides 25 per cent more capacitythrough addi t iona l t r ansponders and twofully steerable 4GHz spot beams.Intelsat VIInte lsa t 's future generation of communications sa te ll i tes will be the largest everbuil t , able to carry 33,000 two-way te lephone calls , double the capacity ofInte lsa t VA. The init ia l $700 mill ioncontract placed in 1982 covers development of In te lsa t VI and produc t ion of thefirst five, with options for up to 11 more.Hughes expects nine of the options to beexercised taking the value of the contractto some $1,300 mill ion.P a y l o a d 38 6 /4GH z t r ansp onde rs10 1 4 / l l G H z t r a n sp o n d e r sO w n e r In te lsa tM a n u f a c t u r e r Hughes Aircraf tO r b i t Geosta t iona ryL a u n c h I n t e l s a tV I - F I Jul 1986 ShuttleF 2 Jan 1987 Shut t le

F 3 Jun 1987 Shuttle or Dec 1987Ar iane 4F 4 Oct 1987 Shuttle or Ariane 4F 5 Apr 1989 ShuttleS t a b i l i s a t i o n SpinP o w e r (end of life) 2 2 kWW e i g h t (at launch) 3,920kg (Ariane 4)4,026kg (Shuttle)D e s i g n l i f e 10 yearsCost $700 million (1982)five craft plusopt ions

R e m a r k s Inte lsa t VI design is scalefrom the HS37 6 bus. Dep loym ent Shuttle will be f r isbee-style , as pioneon the HS381 Leasa t widebody sa teShuttle launch requires a per igee bmotor . The C-band (6 /4GHz) paycomprises two hemispherical , and spot beams p lus Ear th coverage an teT h e K u - b a n d ( 1 4 / l lG H z ) p a ycomprises two steerable spot beAutomat ic s ta t ion keeping has r ecbeen added to the design. Inte lsa t VIbe the f irst to use sa te ll i te-switched division multiple access to connectcircuits .MarecsMarecs sa te ll i tes are leased by European Space Agency to In te rna t iona l Mar i t ime Sa teOrganisa t ion ( Inmarsa t ) . With member countr ie s , Inmarsa t p rovte lecommunica t ions se rv ices to the p ing and of f shore indus t r ie s . Inmarf irst-generation network comprisessate ll i tes. In addit ion to Marecs A andInmarsa t leases mar i t ime communicsubsystems on four Inte lsa t V cInmarsa t i s now eva lua t ing posals for i ts next generation ofto nine sate ll i tes to be available 1988, providing increased cap(125 simultaneous te lephone compared with 50 for Marecs) . teams are competing, led by BrA e r o s p a c e / H u g h e s A i r c r a f t / Mand Marconi Space Sys tems/

VI, built fry Hughes A ircraft leading an international team, will be the world's largest comm unications satellite

FLIGHT International, 12 Janu