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The diameter of the antenna dish is 25 meters (82 feet). The distance
from its center to the subreflector above is about 30 feet. The
photographer of this picture was standing on the opposite edge of
the dish.
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| In the center of the dish stands
the feed housing. The subreflector above is offset from the
center so that it can be rotated on its axis to focus the waves
into any one of the feed apertures. This system is called an
offset cassegrain. It allows The VLBA antennas to be used for
observations at as many as ten different wavelengths. | 
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Modified on
Friday, 26-Sep-2008 12:15:34 MDT
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National Radio
