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The observatory borders National Forest land, and the Allegheny Mountains shield it from some radio interference.
The telescope's location has been the site of important radio astronomy telescopes since 1957.
The Green Bank Telescope operates at meter to millimeter wavelengths.
Its 100-meter diameter collecting area, unblocked aperture, and good surface accuracy provide superb sensitivity across the telescope's full 0.1–116 GHz operating range.
The surface area of the GBT is a 100 by 110 meter active surface with 2,209 actuators (small motors used to adjust the position) for the 2,004 surface panels, making the total collecting area of 2.3 acres (9,300 m The actuators adjust the panel positions to compensate for sagging, or bending under its own weight, which changes as the telescope moves.
Without this so-called "active surface", observations at frequencies above 4 GHz would not be as efficient.
The telescope honors the name of the late Senator Robert C.
The high-sensitivity mapping capability of the GBT makes it a necessary complement to the Atacama Large Millimeter Array, the Expanded Very Large Array, the Very Long Baseline Array, and other high-angular resolution interferometers.
The asymmetric reflector allows the telescope's focal point and feed horn to be located at the side of the dish, so that it and its retractable support boom do not obstruct the incoming radio waves, as occurs in conventional radio telescope designs with the feed located on the telescope's beam axis.
The offset support arm houses a retractable prime focus feed horn in front of the 8 m subreflector and eight higher-frequency feeds on a rotating turret at the Gregorian focus.
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