Equipment - ericsimages

Wrong Control Board

After purchasing a used Losmandy GM8 (my first real equatorial mount), I was unable to get it to track properly. After weeks of working and forum posting, the problem was located. This is a control board for a Losmandy G11 (big brother to the GM8). This was found in the drive box for the GM8. Since the G11 has 360 teeth on the main RA worm gear and the GM8 has only 180, the RA axis was tracking at 2x the Sidereal rate.

Eric ChesakG11 boardGM8LosmandyTracking rateSiderealwrong