Nançay Radio Telescope

Nançay Radio Telescope (NRT) is a radio telescope in central France that began operation in 1965. It incorporates a flat, tiltable reflecting surface, reflecting incoming radio signal to a stationary spherically-curved reflecting surface that focuses the signal on the receiving instruments, which can be moved to adjust the aim. The flat reflector is 40×20 meters, giving it a collection area and resolving ability that varies with the tilt, but can be on the order of that of a 30-meter dish. Common frequencies of observations are 1400 MHz, 1660 MHz, and 3330 MHz.

Note that the abbreviation NRT is also used for the New Robotic Telescope.