Socket Mobile manual Model 1200GTO Parts List Model GTOCP2, Features and Specifications

ASTRO-PHYSICS

1200 GERMAN EQUATORIAL WITH

GTO SERVO MOTOR DRIVE

MODEL 1200GTO PARTS LIST – MODEL GTOCP2

1Polar axis assembly (right ascension-R.A.) with Servo Box GTOCP2

1Declination (Dec.) axis assembly

1Pier 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)

1Stainless counterweight shaft with washer stop and black plastic knob (knob has 5/16 thread)

1Y cable – R.A. portion is 12.5” long and Dec portion is 37.5” long

1D.C. power cord (cigarette lighter adapter on one end) - 8’ long

1GTO Keypad controller with 15’ coiled cable

1Keypad Protector (KEYPRO)

1DigitalSky Voice Software (CD-ROM)

1Hex key set

28-32 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	Azimuth adjustment:	Approximately 14 degrees
Dec worm wheel:	7.2”, 225-tooth aluminum	Setting circles:	Porter Slip Ring design,
Worm gear:	Brass		engraved
R.A. shaft:	3.35” diameter	Right ascension:	4-minute increments, pointer
R.A. thrust bearings:	9.5” diameter	Declination:	1-degree increments, pointer
Dec shaft:	2.36” diameter	Motors:	Zero-cogging servo motors
Dec thrust bearings:	6.5” diameter	Power Consumption:	0.4 amps at the sidereal rate
Counterweight shaft:	18” useable length,		3 amps both motors slewing
	1.875” diameter,	Power requirements:	12 VDC, range 11.5 to 15
	stainless steel,	Weight of mount:	total -91 lbs.
	removable		Dec axis - 30 lbs.
Latitude range:	20 to 68 degrees with or		R.A axis - 47 lbs.
	without polar scope or		counterweight shaft -14 lbs.
	encoders attached (if you are
	above 65° you will have to

remove one pier top knob)

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