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INSAT-4A is the first satellite of the INSAT-4 series. Weighing 3,100 kg at lift-off, INSAT-4A is designed to meet Direct-to-Home (DTH) broadcast requirements. It carries 24 transponders, 12 operating in C-band and the other 12 in Ku-band.
INSAT-4A is launched into Geosynchronous Transfer Orbit (GTO) by Ariane-5 launch vehicle. The satellite is subsequently manoeuvred to 36,000 km high Geosynchronous Orbit (GSO) by firing the Liquid Apogee Motor (LAM) on-board the satellite. In GSO, INSAT-4A will be co-located with INSAT-2E and INSAT-3B satellites at 83 deg East longitude. INSAT-4A is designed for a life of 12 years. INSAT system, which was established in 1983,
is one of the largest domestic communication satellite systems in the Asia-Pacific region comprising eight satellites - INSAT-2E, INSAT-3A, INSAT-3B, INSAT-3C, INSAT-3E, KALPANA-1, GSAT-2 and EDUSAT - with 150
transponders besides meteorological instruments. INSAT-4A will further augment the INSAT system capacity by adding another 24 transponders to the system and play a significant role in the expansion of DTH services. |