| This dual-axis controller/drive corrector is for use with two Vixen MT-1 motor drives on the current Vixen Great Polaris, Great Polaris DX, and Great Polaris Economy German equatorial mounts and on complete scopes using those mounts. It can also be used with the MT-1 on older Super Polaris and Super Polaris DX mounts and scopes. When controlled by the DD-1, the accuracy of the MT-1 motor drive used for right ascension is within +/-0.005% of the sidereal rate. The DD-1 and MT-1 motor are powered by a battery pack holding eight user-supplied D-cell batteries. One set of alkaline batteries will give about 20 hours of use. Maximum current drain is about 800mA. To conserve battery life, a #AC3599 AC adapter providing 3A at 12VDC is available as an option for continuous backyard use. A user-supplied AC adapter capable of providing a minimum of 1.5A at 7.5VDC to 12VDC can also be used, but care should be taken to match plug size and polarity. Any damage to the DD-1 or MT-1 caused by a non-Vixen power supply is not covered by the Vixen warranty. The DD-1 hand control has a three-position switch that integrates selectable northern/southern hemisphere motor drive operation with the power on/off function. A separate switch selects drive correction/centering speeds of 1.5x sidereal, 2x sidereal, and 32x the sidereal rate. Four pushbuttons in a diamond pattern control the direction of the scope at the selected speed. Adhesive Velcro patches are provided for mounting the controller at two separate locations on the scope tripod. A separate cord is provided for hanging the hand control from the mount if that would be more convenient. Knurled plastic adhesive patches are provided for applying to the back of the hand control to give a better grip in cold or damp weather. While the DD-1 can be used with a single MT-1 motor drive for right ascension tracking only, two MT-1 motors are needed for dual- axis operation with any of the above mounts. When an MT-1 is attached to a mount, manual slow motion control of the mount for rapid centering of objects is lost. If manual slow motion control is needed, a manual clutch (#VMC) is available as an option. One #VMC is needed for each MT-1 drive motor.
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