Question: What is the experimental satellite which was the forerunner to the communication satellite of the operator of the RESOURCESAT-2 called?

Knowledge 1: Resourcesat-2
Resourcesat-2 is a follow on mission to Resourcesat-1 and the eighteenth Indian Remote Sensing satellite built by ISRO. The new satellite provides the same services as the original RESOURCESAT-1, but was also designed to "provide data with enhanced multispectral and spatial coverage". Compared to Resourcesat-1, LISS-4 multispectral swath has been enhanced from 23 km to 70 km based on user needs. Suitable changes including miniaturization in payload electronics have been incorporated in Resourcesat-2. Resourcesat-2 along with Youthsat and X-Sat (Singapore) was launched on PSLV-C16 on 20 April 2011. [SEP] Knowledge 2: ATS-6
ATS - 6 (Applications Technology Satellite - 6) was a NASA experimental satellite, built by Fairchild Space and Electronics Division It has been called the world's first educational satellite as well as world's first experimental Direct Broadcast Satellite as part of the Satellite Instructional Television Experiment between NASA and Indian Space Research Organisation (ISRO). It was launched May 30, 1974, and decommissioned July 1979. At the time of launch, it was the most powerful telecommunication satellite in orbit. ATS - 6 carried no fewer than 23 different experiments, and introduced several breakthroughs. It was the first 3 - axis stabilized spacecraft in geostationary orbit. It was also the first to use experimentally with some success electric propulsion in geostationary orbit. It also carried several particle physics experiments, including the first heavy ion detector in geostationary orbit.
Knowledge 1: Resourcesat-2
Resourcesat-2 is a follow on mission to Resourcesat-1 and the eighteenth Indian Remote Sensing satellite built by ISRO. The new satellite provides the same services as the original RESOURCESAT-1, but was also designed to "provide data with enhanced multispectral and spatial coverage". Compared to Resourcesat-1, LISS-4 multispectral swath has been enhanced from 23 km to 70 km based on user needs. Suitable changes including miniaturization in payload electronics have been incorporated in Resourcesat-2. Resourcesat-2 along with Youthsat and X-Sat (Singapore) was launched on PSLV-C16 on 20 April 2011. [SEP] Knowledge 2: Polar Satellite Launch Vehicle
The Polar Satellite Launch Vehicle (PSLV) is an expendable medium-lift launch vehicle designed and operated by the Indian Space Research Organisation (ISRO). It was developed to allow India to launch its Indian Remote Sensing (IRS) satellites into sun-synchronous orbits, a service that was, until the advent of the PSLV in 1993, commercially available only from Russia. PSLV can also launch small size satellites into Geostationary Transfer Orbit (GTO).
Knowledge 1: Resourcesat-2
Resourcesat-2 is a follow on mission to Resourcesat-1 and the eighteenth Indian Remote Sensing satellite built by ISRO. The new satellite provides the same services as the original RESOURCESAT-1, but was also designed to "provide data with enhanced multispectral and spatial coverage". Compared to Resourcesat-1, LISS-4 multispectral swath has been enhanced from 23 km to 70 km based on user needs. Suitable changes including miniaturization in payload electronics have been incorporated in Resourcesat-2. Resourcesat-2 along with Youthsat and X-Sat (Singapore) was launched on PSLV-C16 on 20 April 2011. [SEP] Knowledge 2: Communications satellite
The first and historically most important application for communication satellites was in intercontinental long distance telephony. The fixed Public Switched Telephone Network relays telephone calls from land line telephones to an earth station, where they are then transmitted to a geostationary satellite.  The downlink follows an analogous path.  Improvements in submarine communications cables through the use of fiber-optics caused some decline in the use of satellites for fixed telephony in the late 20th century.

Answer: ATS - 6 (Applications Technology Satellite - 6)