own separate drivers. Refer to the section regarding focus adjustment in the GTO Keypad Manual for instructions on using
the keypad controller to adjust focus.
RETICLE Connector
If you wish to use the illuminator cable for our Polar Alignment Scope (PASILL4 or earlier models), a plug-in type guiding
eyepiece with an illuminated reticle (available from several manufacturers), insert the 3.5mm phono plug into this connector
for power. Reticle brightness can be adjusted with the keypad. Refer to the section pertaining to reticle illuminator adjustment
in the GTO Keypad Manual for further information.
AUTOGUIDER Connector
This connector interfaces with the RJ-11-6 modular jack of an autoguider cable, purchased separately or as part of a CCD
Imaging Camera or Autoguider. The autoguider will be functional and ready to go as soon as you plug it in. Please refer to
the appropriate manual from the manufacturer for operation of the autoguider.
+6V Connector
This 6-volt output accepts 3.5mm phono plugs. It is used primarily to power the Pentax 6x7 camera directly from the mount
with a cord sold for that purpose (our part # CORD01). It will supply up to 200mA of current.
N and S Switch
Select northern (N) or southern (S) hemisphere as needed. When you slide the switch to the opposite position, the tracking
direction of the drive will reverse. The power cord must be removed and re-attached to make this work.
Drainage Holes
Two holes are drilled into the lower portion of the bottom of the control box. These holes allow excess moisture to drain from
your control box, particularly useful on dewy nights. Please do not plug these holes.
Removing the GTO Control Box From 1200 Mount
The GTO control box can be removed easily from the RA axis. It is secured by two 8-32 set
screws located at the base of the GTO Servo Control Box. Loosen the screws with one of
the hex keys from the set included with the mount. Lift the box up from the bottom and tilt so
that it frees from the dovetail connection.
Some people have a permanent observatory, yet prefer to store their electronics in their
home to keep them clean and free of cobwebs. If you do, you may wish to substitute the 8-
32 thumbscrews (included with your mount and shown in photo) for the setscrews. This will
allow you to remove and install your GTO control box without tools.
GTO KEYPAD OPERATION
Please refer to the manual for the GTO Keypad Controller for complete instructions.
PULSEGUIDE BY SIRIUS-IMAGING
PulseGuide™ is a stand-alone Windows (98, ME, 2000, NT4, XP, Vista) utility that provides complete remote control of all
Astro-Physics GTO mounts. It derives its name from its most distinctive feature, pulse guiding, which can improve unguided
tracking. Specifically, it can help correct tracking errors caused by polar misalignment and atmospheric refraction. You can
also train PulseGuide™ to track objects moving relative to the stars, such as asteroids, comets, and the moon. In addition to
pulse guiding, PulseGuide™ also has many useful utility features. PulseGuide™ was written by Ray Gralak of Sirius-
Imaging. The complete PulseGuide™ user’s manual is included on your PulseGuide™ CD in PDF format. Please read it
carefully to take full advantage of this powerful mount control software. See
for the latest information.
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Summary of Contents for German Equatorial 1200GTO
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