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Bangalore March 12 ISRO expects the total number of transponders to touch 300 in the next two years. It will cross 200 and reach 211 later this year when it launches the replacement satellite, 4CR, an official said.

Three or four more telecom satellites are slated for launch by 2009 and each satellite normally adds 24 transponders and the latest, 4B, takes the Insat capacity tally to 199 when it becomes operational in a month.

Currently, all but nine of the (pre-4B capacity of) 175 transponders are loaded. Five have been kept spare for emergencies while four have been kept `off', the official said.

Private broadcasters hog 40 transponders; VSATs and government users take 38. BSNL has taken 34 transponders while DD and AIR use 16, he said.

The Insat system, established in 1983, is the only single system in the world to support diverse services such as telecommunication, television and radio broadcasting, weather forecast, disaster warning, tele-education and telemedicine.

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