Tatel was NRAO’s first telescope, an 85-foot dish built from a kit in 1959.


300-foot Telescope
A 300-foot transit radio telescope operated in Green Bank from 1962 until 1988. It was the world’s largest telescope for many years.

Green Bank Interferometer
The Green Bank Interferometer is a set of three 85-foot dish antennas that were used together with an outlier as one large telescope.

Millimeter-wave Telescopes
Since the late 1950s, we have built radio telescopes to detect millimeter waves, the shortest radio waves that reach us through the atmosphere.

Calibrating Antennas
Measuring the atmosphere, radio interference, and the radiation from bright radio sources is a critical part of making accurate observations.