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| The propulsion system
was situated at the bottom of the
cylindrical spacecraft body and was the
main structural element of the orbiter.
It consisted of a cylindrical fuel tank
divided into separate compartments for
fuel and oxidizer. The central part of
the main body was composed primarily of
this fuel tank. The engine was mounted on
a gimbal on the lower surface of the tank.
The descent module was mounted on top of
the orbiter bus. The two solar arrays
extended from the sides of the cylinder
and a 2.5 meter diameter parabolic high-gain
communications antenna and radiators were
also mounted on the side. Telemetry was
transmitted by the spacecraft at 928.4
MHz. The instruments and navigation
system were located around the bottom of
the craft. Antennae for communications
with the lander were affixed to the solar
panels. Three low power directional
antennae extended from the main body near
the parabolic antenna. |
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