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INSAT-4CR
INSAT-4CR is a communications satellite operated by ISRO as part of the Indian National Satellite System. Launched in September 2007, it replaced the INSAT-4C satellite which had been lost in a launch failure the previous year. The satellite is stationed in geostationary orbit at a longitude of 74 degrees east, and is expected to operate for ten years, however this may have been reduced by the underperformance of the Geosynchronous Satellite Launch Vehicle which placed it into orbit.
==Spacecraft==
INSAT-4CR was constructed by ISRO, and is based around the I-2K satellite bus. A spacecraft, it is equipped with twelve Ku band transponders operating at a frequency of 36 MHz, with 140 Watt travelling wave tube amplifiers. The satellite has an effective isotropic radiated power of 51.5 dBW. An additional Ku band signal is used as a beacon for tracking.
INSAT-4CR operates in a geostationary orbit at a longitude of 74 degrees east, providing communications to India.〔(【引用サイトリンク】title=INSAT 4CR )〕 Broadcasting capacity on INSAT-4CR is allocated to Airtel Digital TV and Sun Direct DTH. At launch, the satellite was carrying of fuel,〔 for raising itself into geostationary orbit, and subsequently operateing there for a planned twelve years.〔(【引用サイトリンク】title=INSAT-4CR )〕 Increased expendature of fuel reaching geostationary orbit, due to launch underperformance, may have resulted in a loss of up to five years of operational life.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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