Beneath the Turret

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Beneath the Turret

The receivers of the Green Bank Telescope (GBT) hang from a rotating turret. To change to a new receiver, the radio astronomy equivalent of changing the channel, the turret is spun until the desired receiver is aimed underneath the beam of waves coming from the directional mirror above.

Credit: B. Saxton, NRAO/AUI/NSF

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GBT Radio Telescopes and Technology

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Beneath the Turret

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The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
	Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.
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