Intro:

• The x,y,z coordinate system for the dish has:
• x (positive East)
• y (positive North)
• z (positive up)
  
• The center of curvature of the sphere defines the center of the coordinate system.
• except: z0  has been translated by -RadiusOf curvature so x0,y0,z0 is close to AO9 (at the center of the dish).
  
• The suspension cables:
• The main cables run north-south.
• They are spaced every 25 feet in x (east-west) (x+ is eastward).
  
• The smaller  cables
• run east- west
• are spaced every 3 (or 3.25) feet
• They are attached to the  main cables at each 25 foot crossing
• The 3 x 6.25 foot panels lay with the long direction in the east-west direction.
• there are 4 panels between each main cable.
• The survey1,2 targets are on the northWest corner of each panel.
• Tiedown cables are used to pull the main cable from a catenary into a sphere.
• They are spaced about every 15 feet along a main cable,.
  

Main cable names:

• Naming convention:
• XYZZ
• X: N(North),S(South)
  
• Y: E(East),W(west), or C(center)]
• ZZ: cable id
• The distance from center is a theoretical value using 0 for the center cable and spacing them every 25 feet.
  

• North		South		abs(s) distance from Center [Ft]
  NC06		SC06		0
  NE	NW	SE	SW
  NE00	NW00	SE00	SW00	25
  NE01	NW01	SE01	SW01	50
  NE1A	NW1A	SE1A	SW1A	75
  NE1B	NW1B	SE1B	SW1B	100
  NE1C	NW1C	SE1C	SW1C	125
  NE02	NW02	SE02	SW02	150
  NE2A	NW2A	SE2A	SW2A	175
  NE2B	NW2B	SE2B	SW2B	200
  NE2C	NW2C	SE2C	SW2C	225
  NE03	NW03	SE03	SW03	250
  NE3A	NW3A	SE3A	SW3A	275
  NE3B	NW3B	SE3B	SW3B	300
  NE3C	NW3C	SE3C	SW3C	325
  NE04	NW04	SE04	SW04	350
  NE4A	NW4A	SE4A	SW4A	375
  NE4B	NW4B	SE4B	SW4B	400
  NE4C	NW4C	SE4C	SW4C	425
  NE05	NW05	SE05	SW05	450
  NE5A	NW5A	SE5A	SW5A	475
  NE5B	NW5B	SE5B	SW5B	500

TARGETS

    The 2000-2003 surveys placed targets on the northwest corner of each panel.

• primary reflector cables, targets
  
• Surveying the primary

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