Bangalore: Indian Space Research Organisation (ISRO) plans to launch seven satellites in the INSAT-4 series to augment its capacity to 250 transponders by 2007.

According to ISRO's annual report for 2002-03, the transponder capacity of INSAT-4 series has been worked out after evaluating the requirement projected for different uses and by user departments.

With INSAT-4 series, the INSAT system will have about 250 transponders in various banks catering to a demand of up to 11 gigabits per second (GBPS) capacity, the report said.

Distribution of transponders in INSAT-4 satellite series are, INSAT-4a 12 KU band 12 C band, INSAT-4b 12 KU band 12 C band, INSAT-4c 18 KU band, INSAT-4d (spare) 12 C band, six extended C band, INSAT-4e 12 C band, six extended C band, INSAT-4f 12 C band, 6 extended C band and in INSAT 4g 18 KU band transponders, the report said.

The INSAT-4d satellite will be a spare satellite. The series will have 60 KU band transponders, 48 C band transponders and 12 extended C band transponders, the report added.

PTI