Gemini Users Manual 89
7.1.7 GoTo Position is Completely Wrong
• UTC Date/Time, Mount Type and Geographic Location must be set correctly. Be
sure to Cold Start the mount after changing these settings, or set them during the
startup procedure of the Cold start.
• Be sure to correctly identify the objects you use for alignments. Misidentification
of the first alignment star will result in a wrong GoTo position.
7.1.8 Poor Pointing Accuracy
• Make sure your mount is polar aligned within a few degrees of the pole.
• Accuracy is impossible if the mount is not accurately polar aligned and no
Additional Alignments have been done. Select some of the Bright Stars in the
Alignment menu, center them, and do an “Additional Align.” With the alignment
of each object, accuracy should improve.
• Inaccuracy in GoTo operation can occur if you did a meridian flip and have not
yet done an Additional Align on this side of the meridian. Gear play and mirror
flop are taken into account after the first “Additional Align” on this side of the
meridian is done.
• Check that you have not misidentified a star used for an alignment. This would
cause the pointing model to be inaccurate.
• For the first few “Additional Align” operations, make sure that the stars used are
well spaced in RA, and are accurately centered prior to performing the
“Additional Align.”
• Avoid systematic errors when building a pointing model. Many star diagonals will
de-center stars when they are rotated relative to the OTA. Rotate the diagonal
back to a consistent position before centering objects for alignment.
• For highest accuracy, use the Bright stars of the “Align Telescope” menu for
alignments, since their positions are stored with the highest accuracy.
Alternatively, use objects transferred from a PC in High Precision mode.
• If pointing at stars and deep sky objects is accurate, but solar system objects are
significantly off, the UTC date or time setting may be wrong.
7.1.9 Strange or Garbled Characters in Deluxe Hand Controller
Display
• Try using the “Setup→Restore Defaults” menu item to reset the CMOS. Also
check to see you have the latest EPROM software.
7.1.10 Mount Takes Too Long to Center Object
• The object may be close to the east or west limit, where it will move the last few
degrees in centering mode.
7.1.11 Mount Continuously Beeps
• You have hit the east or west limit. Slew away from limit.
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