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EM-11 EQ mount specifications

Main specifications

Spec. EM-11 USD-3 EM-11 Temma-2 Jr
Type German Equatorial Mount
R.A. Slow-Motion Motor driven
DEC. Slow-Motion Motor driven
Azimuth Adjustments ± 10°
Elevation Adjustments 20 to 50°
Polar Finder / Accuracy Built-in / 5'
R.A. Setting Circle Accuracy 10 arcminutes
DEC. Setting Circle Accuracy
Encoders - Supplied
Weight (without counterweight) 7 kg
Counterweights 3.5 kg
Maximal Loading Capacity 9 kg (without counterweight)
Optimal Loading Capacity 6 kg (without counterweight)
Operating Voltage 12V / 24V DC
Power Consumption 12V : 0.3A (tracking at sidereal rate), 1.3A (high speed slewing), 1.7A (starting)
24V : 0.3A (tracking at sidereal rate), 1.9A (high speed slewing), 1.9A (starting)
Tube moutings 2 x M8 screws (separated by 35mm)
Mounting Capacities Tube rings, plates and dovetail mounting plates
Option Tripods, stand piers

Mecanical Specifications

Spec. EM-11 USD-3 EM-11 Temma-2 Jr
R.A. axis diameter (material) 52 mm (aluminium)
R.A. worm gear shaft diameter (material) 14 mm (iron)
R.A. gear diameter (material) 74 mm/144 teeth (zinc)
DEC. axis diameter (material) 52 mm (aluminium)
DEC. worm gear shaft diameter (material) 14 mm (brass)
DEC. gear diameter (material) 74 mm/144 teeth

Motor Drive Specifications

Spec. EM-11 USD-3 EM-11 Temma-2 Jr
Type USD-3 Temma-2 Jr
Stepper Motors Accuracy 100 pps
Slow Motion Speeds 0.1x to 1.9x the sidereal rate
High Speed Mode 120x the sidereal rate (12V DC)
240x the sidereal rate (24V DC)
Worm gear shaft cycle 10 minutes
Tracking Accuracy ± 10"
Autoguiding SBIG ST-4/7 compatible