Info

• Primary reflector general info (cable names, spacing,lengths..)
• Surveys: the primary,secondary,tertiary, horns.
• cable sag surveys
• Drawings:
• telescope construction 1960.
• Index of 1960 drawings
• telescope layout gregorian upgrade drawings (.pdf)
• Luis's contour map of the dish (25 contours) from the drone images (.pdf)
• After the collapse.
  
• Analysis of backstay cable removed 1981
  
• Condition of steel cable after period of service (.pdf)
  
• S.Leigh Phoenix,Herbert  H. Johnson, William McGuire, J. Struct. Eng. 112(6):1263-1279C
• M4N aux socket termination failure investigation (nasa) (.pdf)  (111MB)
• thornton tomasetti arecibo telescope collapse Forensic investigation (.pdf) (69MB)
  

General topics

• oscillation frequencies of platform
  

Measurements/events

• 210910:Twr4 elevator tilt
  
• 210506: compare a parabola, catenary, and sphere spanning the AO dish.
• 210315: tower, primary,and paraxial surface locations
• 201217: Scanning the towers after the collapse (are they tilted?)
• 01dec20 during and after the collapse
  
• Prior to collapse
  
• oct20: monitoring of cable temps and strain as well as tower tilt.
  
• sep20 - cable sag surveys
  
• 10aug20: auxmain4north cable comes out of socket.
  
• jan2020- azimuth motion during jan20 quakes.
  
• 13jan14: earthquake damages M8-4 splice cable
  
• feb11: computing the number of cycles the telescope has been through (2004.5 thru 2010)
  
• 05feb11: finished reinforcing the telescope.
• feb10-feb11: Telescope broken beam repair
  
• 30mar10: computing the unbalanced  moment on the azimuth arm.
  
• jul06: cat walk weight survey

photos

• 180616: compare pictures with blackmore scanner results,.
  
• from southern part of rim road.. looking north along main cables
• under the dish, southern part of road looking up to the south
• from ao9
• 200810  photos of  auxMain4North failure 
  
• cable sockets    
  
• Catwalk suspension
  

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