Astro-Physics 400GTO, 600EGTO, 900GTO and 1200GTO mounts shipped from June 1999 to October 2003 featured high-quality DC servo motor drive electronics including the GTOCP2 Control Box. The following information pertains to that drive system.
These sophisticated, versatile
mounts can be operated with the GTO handheld
computer keypad controller alone or in conjunction
with various popular software packages on your
The GTO Control System essentially eliminates the need to purchase additional accessories such as a polar alignment scope or mounted encoders and digital setting circles. Most of the functions of these accessories are included in the GTO Computer System.
The GTO control box contains all of the circuitry to drive the two servo motors and the logic required to circumnavigate the sky. This electronics box is mounted directly on the polar axis of the 1200 and 900 mounts and is a stand-alone unit for the 400 and 600E mount. We provide a pouch with a handle for the freestanding unit.
The main function of the servo controller is to drive the RA and DEC motors. The motors are DC servos with built-in shaft encoders. The rotation rate of the motors is controlled with a servo feedback loop. The servo looks at the return pulses from the shaft encoders and adjusts the current to the motor so that the rate is identical to the commanded rate (i.e. from .25x sidereal to 1200x sidereal). The servo is digitally controlled, and the shaft position is updated at a rate of 2000 times per second.
|Dimensions of servo box||4.9"x4.9"x1.8" (12.5x12.5x3.4cm|
|Weight||1.5 lbs. (0.7 kg)|
|Suggested power sources||Portable 12V battery pack, auto or marine battery, 110 to 12V DC Power Supply (5 amp minimum, regulated and well-filtered to prevent spikes)|
|Standards||Meets FCC requirements for home and office use.|
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This page was last modified: March 10, 2019
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