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ASTRO-PHYSICS
1200 GERMAN EQUATORIAL WITH
GTO SERVO MOTOR DRIVE
MODEL 1200GTO PARTS LIST – MODEL GTOCP2
1 Polar axis assembly (right ascension-R.A.) with Servo Box GTOCP2
1 Declination (Dec.) axis assembly
1 Pier top adapter with six (6) 5/16-18 x 5/8" button head screws with washers
(these may be attached to your pier post if you ordered one)
1 Stainless counterweight shaft with washer stop and black plastic knob (knob has 5/16 thread)
1 Y cable – R.A. portion is 12.5” long and Dec portion is 37.5” long
1 D.C. power cord (cigarette lighter adapter on one end) - 8’ long
1 GTO Keypad controller with 15’ coiled cable
1 Keypad Protector (KEYPRO)
1 DigitalSky Voice Software (CD-ROM)
1 Hex key set
2 8-32 thumbscrews (substitute these for 8-32 set screws that hold GTO Servo Control Box in place, if you wish)
In order to fully assemble your mount, you will need the following items sold separately: mounting plate, 10” O.D. pier,
counterweights, and portable rechargeable battery pack (or 110 to 12V DC converter). Several sizes and types are
available for your selection. Many of these items will be discussed throughout these instructions.
Several additional options are available:
Longer counterweight shaft – 27” useable length, part # M12661
Santa Barbara Instrument Group CCD Imaging cameras and ST-4 Autoguider or STV - if you plan to pursue CCD
imaging or astrophotography
Pier accessory trays for 10” pier and support bars - handy to keep your eyepieces close at hand
Polar axis telescope - threads into the base of the polar axis assembly. Many users find a polar axis telescope useful for
zeroing in on the pole quickly, particularly with telescopes that are not orthogonal to the mount.
Mounted encoders – Although you can use these with your mount, they are not necessary since the go-to functions of
the mount are more accurate. The 4000 steps of the encoders, which read the position of the shaft are very
coarse (324 arc seconds) while the encoder that is built into the servo motor itself is 0.05 arc seconds.
FEATURES AND SPECIFICATIONS
R.A. worm wheel: 10.3”, 225-tooth aluminum
Dec worm wheel: 7.2”, 225-tooth aluminum
Worm gear: Brass
R.A. shaft: 3.35” diameter
R.A. thrust bearings: 9.5” diameter
Dec shaft: 2.36” diameter
Dec thrust bearings: 6.5” diameter
Counterweight shaft: 18” useable length,
1.875” diameter,
stainless steel,
removable
Latitude range: 20 to 68 degrees with or
without polar scope or
encoders attached (if you are
above 65° you will have to
remove one pier top knob)
Azimuth adjustment: Approximately 14 degrees
Setting circles: Porter Slip Ring design,
engraved
Right ascension: 4-minute increments, pointer
Declination: 1-degree increments, pointer
Motors: Zero-cogging servo motors
Power Consumption: 0.4 amps at the sidereal rate
3 amps both motors slewing
Power requirements: 12 VDC, range 11.5 to 15
Weight of mount: total -91 lbs.
Dec axis - 30 lbs.
R.A axis - 47 lbs.
counterweight shaft -14 lbs.