The Giant Metrewave Radio Telescope
With thirty antennas, each of diameter 45 metres, spread out over a maximum distance of 25 km, the GMRT is the biggest and most sensitive radio interferometer in the world at low frequencies, < 1 GHz. It is used for scientific observations by astronomers around the world, via competitive selection of observing proposals. In order to retain its premier status in the world over the next decade, much activity is currently under way to upgrade the GMRT, including the building of new low-frequency radio receivers and a new correlator, besides upgrading most of the electronics and the telescope control system. The sensitivity of the upgraded GMRT will have increased by a factor of at least 3 at all frequencies. Studies are also in progress to further upgrade the GMRT, by increasing both the number of antennas and the maximum antenna separation.