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14 13 t minus 10 nine eight seven six

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five four we've gone for main engine

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when the Space Shuttle returns to flight

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later this year its first payload will

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be the TRW built tracking and data relay

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satellite known it's tedious this will

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not be the first time this NASA

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satellite has made history it is the

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largest and most sophisticated

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communication spacecraft ever launched

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and provides comprehensive

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telecommunication services by relaying

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voice television digital and analog

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signals here shown undergoing final

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integration and test procedures at trw

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is the third in a series of these

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satellites built by trw Space and

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Technology Group in redondo beach

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california the first satellite has been

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an orbital operation since the summer of

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1983 and the second was lost with the

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ill-fated challenger in 1986 the mission

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of teachers is to provide NASA with

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communications and data relay between

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its low Earth orbiting satellites

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including the shuttle and the ground

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tigres is a huge spacecraft weighing

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approximately 5,000 pounds when it

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reaches its station some 22,000 miles

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above the earth it's solar arrays will

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be unfolded and extend over 50 feet from

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tip to tip the spacecraft operates in

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three frequency bands and can handle up

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to 26 satellites passing beneath it a

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virtual antenna farm with seven antennas

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including a 30 element phased array

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Tigres is the first telecommunication

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satellite able to operate on three

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separate frequency bands simultaneously

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the satellites high data rate of 300

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million data bits of information per

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second is capable of relaying the

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information packed in one hundred

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volumes of an encyclopedia in just one

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second trw is building six of these

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spacecraft for NASA during September of

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1987 the crew of discovery visited trw

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to see firsthand the payload they will

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be carrying into orbit in the five years

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that the flight one spacecraft has been

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in operation teachers has been

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supporting all shuttle operations as

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well as Landsat and other nasa

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spacecraft mission

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it represents a significant improvement

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in utilizing our space resources in the

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past orbiting spacecraft could

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communicate with earth only when they

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were in sight above one of several

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ground tracking stations typically less

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than one-fifth of the time or the

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constellation of three teacher

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satellites is completed spacecraft will

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be able to communicate with earth

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through eighty percent or more of their

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orbit as the launch date nears teachers

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see will undergo final checkout it will

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then go into a protected packing

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container for convoy to Los Angeles

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International Airport where it's loaded

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what impact does teachers have on the

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American space program as an example

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back in 1983 the crew of the ninth

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shuttle flight was the first to relay

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their data through the tee dress network

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in that single 10-day mission more

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information was relayed to the ground