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overlay: $200K (Reagan) 4-5 chips, power supply schedule ~ 2 mos for design, some time for parts. Problem: controls for moving picture on screen 7/25 mtg: Monday @ 1300 (CCTV overlay) overlay positioning: possible sources of error (1) parallax (2) misplaced overlay (3) deformation of CCTV relative to EE (thermal def) (4) "uncalibration" by operator (monitor adjustment) in flight (1)&(2) are only problems for a physical overlay (not an electronic overlay) & affect primarily y^ & z^ (3) would affect both & primarily in y^ & z^ (4) would affect only electronic overlay with adjustment capability, & could affect x^, y^, or z^ estimate - .2" on flight monitor = 1" at EE when grapple fixture is at middle of x^ envelope. y^ tolerance is ±4". Estimate allowable equipment errors (1) parallax: [[diagram]] δ = d tan Φ