Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> Mounts

Pages: 1
B. Hebert
super member


Reged: 09/04/06

Loc: Southern California
SVP Fast Periodic Error
      #4533386 - 04/21/11 03:19 AM

Looking through my guiding eyepiece, such as during drift alignment, the TrueTrack drive on my SkyView Pro mount shows a slow but visible oscillation in one direction that appears to have about a 20 second cycle. Looking at the drive motor in operation, each tooth of the drive motor appears to pass a point in about 18.9 seconds. This would correspond to the teeth of the drive motor engaging the worm gear and would account for the oscillation of my stars, and perhaps my oblong star images. Since this suggests poor gear design can anyone recommend a fix, other than replacing the mount?

Would this oscillation be correctable with guiding? Can guiding (PHD) keep up with periodic error this fast?

Assuming I keep this, would you recommend a faster camera speed (DSI)? Would .5 accomplish it, or can PHD pick up error this fast and adequately correct for it?

B. Hebert


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
10 registered and 24 anonymous users are browsing this forum.

Moderator:  Dave M, richard7, bilgebay 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 309

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics