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1 • or Single-access as it is gathered, engineering A (broad- system simultaneously. science f multi- access engineering channels transmits provides single-channel for antennas areas. multiple-access commands gain subsystem and cast) both high the 2-8 is placed when in orbit the high-gain low-gain antennas, can be used while or retrieved, antennas manufacthe HST or in emergencies cannot be used. 3 Data The Management data receives Subsystem management subsystem communications, commands from the tions Control Center, systems and the scientific stores, The • DF-224 computer • • Data Four • • Three engineering/science Two oscillators except OTA.

5 m) long. 2 m) wide section has machined and a trapezoid, for one the for release the using by a stepper antennas, aperture a four-bar motor called actuator. are three antenna, also hinge and operate drives: one using one for the a for each door. The rotary-drive Both hinges and latches have hex wrench fittings so an astronautcan manually operate the mechanism to deploy the door, antenna, or array if a motor fails. Figure 2-10 shows the antenna dish. Communications Subsystem HIGH GAIN ANTENNA The instrumentation and communications sub- system between provides the communications loop the HST and the TDRS satellites, sending and receiving messages, and data through the high and nas and passing the information management refer subsystem.

To the commands electronics go through com- from the the data The optical control trols the white light electronics optical control (OCE) sensors. interferometers quality ground which of the OTA for analysis. each FGS, OCE. but unit con- and are are the send There all OCSs These measure the data is one OCS controlled to for by the uses mirror The data interface distortion The EP/TCE data for trans- units interface between and the unit (DIU) is an electronic the other OTA electronics HST command and telemetry system.

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