oct2019

# Intro:

The primary reflector consists of 3' by 6.25'  (or 3.25' by 6.25')  perforated panels suspended on cables.
• 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:

The plot shows the main cable names (.ps)  (.pdf)
• 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
processing: x101/dish/coordsys

# TARGETS

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

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