PDS_VERSION_ID                     = PDS3
RECORD_TYPE                        = STREAM
LABEL_REVISION_NOTE                = "2007-07-11 GEO:JGW"

OBJECT                             = INSTRUMENT
 INSTRUMENT_ID                     = "GBT"
 INSTRUMENT_HOST_ID                = "NRAO"

 OBJECT                            = INSTRUMENT_INFORMATION
  INSTRUMENT_NAME                  = "ROBERT C. BYRD GREEN BANK TELESCOPE"
  INSTRUMENT_TYPE                  = RADAR
  INSTRUMENT_DESC                  = "

  Instrument Overview
  ===================
  
  The following information comes from the NRAO website
  (http://www.gb.nrao.edu/GBT/GBT.shtml):
    
  'The GBT is described as a 100-meter telescope, but the actual dimensions
  of the surface are 100 by 110 meters. The overall structure of the GBT is a 
  wheel-and-track design that allows the telescope to view the entire sky
  above 5 degrees elevation. The track, 64 m (210 ft) in diameter, is level
  to within a few thousandths of an inch in order to provide precise pointing
  of the structure while bearing 7300 metric tons (16,000,000 pounds) of
  moving weight.
  
  The GBT is of an unusual design. Unlike conventional telescopes, which have
  a series of supports in the middle of the surface, the GBT's aperture is 
  unblocked so that incoming radiation meets the surface directly. This 
  increases the useful area of the telescope and eliminates reflection and
  diffraction that ordinarily complicate a telescope's pattern of response.
  To accommodate this, an off-axis feed arm cradles the dish, projecting
  upward at one edge, and the telescope surface is asymmetrical. It is
  actually a 100-by-110 meter section of a conventional, rotationally
  symmetric 208-meter figure, beginning four meters outward from the vertex
  of the hypothetical parent structure.'
  
  See 'Observing With The Green Bank Telescope' [MINTER2007] for more
  information.

  "

 END_OBJECT                        = INSTRUMENT_INFORMATION

 OBJECT                            = INSTRUMENT_REFERENCE_INFO
  REFERENCE_KEY_ID                 = "MINTER2007"
 END_OBJECT                        = INSTRUMENT_REFERENCE_INFO

END_OBJECT                         = INSTRUMENT
END