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APPENDIX A - TECHNICAL SPECIFICATIONS
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NexStar 80GTL
Design Refractor
Aperture 80mm
Focal Length 900mm
F/ratio of the Optical System F/11
Objective Coatings Fully Coated
Highest Useful Magnification 189x
Lowest Useful Magnification 11x
Resolution: Rayleigh Criterion
Dawes Limit
1.73 arc seconds
1.45 arc seconds
Light Gathering Power 131x unaided eye
Field of View: Standard Eyepiece 1.4º
Linear Field of View (at 1000 yds) 74 feet
Eyepiece Magnification: 36x (25mm)
90x (10mm)
Optical Tube Length 35 inches
Electronic Specifications
Input Voltage
Maximum
Minimum
12 V DC Nominal
18 V DC Max.
8 V DC Min.
Batteries Required 8 AA Alkaline
Power Supply Requirements 12 VDC-750 mA (Tip positive)
Mechanical Specifications
Motor: Type
Resolution
DC Servo motors with encoders, both axes
.26 arc sec
Slew speeds Nine slew speeds: 4º /sec, 2º /sec, 1º/sec, .5 /sec, 32x, 16x, 8x, 4x, 2x
Hand Control Double line, 16 character Liquid Crystal Display
19 fiber optic backlit LED buttons
Fork Arm Cast aluminum
Software Specifications
Software Precision 16 bit, 20 arc sec. calculations
Ports RS-232 communication port on hand control
Tracking Rates Sidereal, Solar and Lunar
Tracking Modes Alt-Az, EQ North & EQ South
Alignment Procedures AutoAlign, 2-Star Alignment, Quick-Align
Database 25 user defined programmable object.
Enhanced information on over 100 objects
Total Object Database 4,033 Objects