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Construction of the first radio telescope, DSS 11 or the Pioneer Deep Space Station, was begun by the United States Army and taken over by NASA after its creation. It is a 26-metre (85 ft) parabolic Cassegrain antenna capable of receiving signals in the 1 to 3 GHz range. [9]
That failed unit was placed on ESP-2 FRAM-5 until it was returned by STS-122.[12] S-band Antenna Support Assembly (SASA) weight 256 lb each × 2 active units and one other spare on ISS. The SASA consists of the assembly contingency radio frequency group (RFG, or ACRFG), SASA boom and avionics wire harness.
Various options for repair are under consideration, including replacement of the entire S1 radiator in a future flight, possibly with return of the damaged unit to ground for detailed study. On 15 May 2009, the damaged radiator panel's ammonia tubing was mechanically shut off from the ETCS, by the computer-controlled closure of a valve.
Pioneer 6, 7, 8, and 9 were space probes in the Pioneer program, launched between 1965 and 1969. They were a series of solar-orbiting, spin-stabilized, solar cell- and battery-powered satellites designed to obtain measurements on a continuing basis of interplanetary phenomena from widely separated points in space. [ 5 ]
An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...
The modernization also extended the useful range of communications for Pioneer 10 from about 50 astronomical units to about 60 astronomical units at S-band. After the Voyager Uranus flyby, the DSN demonstrated the capability of combining signals from the radio astronomy antenna at Parkes, Australia, with the Network antennas at Tidbinbilla.
A monoblock (or monobloc) LNB is a single unit comprising two, three or four LNBs and a DiSEqC switch, designed to receive signals from two, three or four satellites spaced close together and to feed the selected signal to the receiver. The feedhorns of the two LNBs are at a fixed distance apart for reception of satellites of a particular ...
A spacecraft's attitude must typically be stabilized and controlled for a variety of reasons. It is often needed so that the spacecraft high-gain antenna may be accurately pointed to Earth for communications, so that onboard experiments may accomplish precise pointing for accurate collection and subsequent interpretation of data, so that the heating and cooling effects of sunlight and shadow ...