I’ve installed a Nexdome rotation kit on my 8’ Exploradome. The installation went really well, the stepper has no problems rotating the dome and the software plays nice with SGP. My problem is the sync of the dome slit to the scope, it’s consistently off by roughly 8 degrees on all targets. I’ve remeasured the parameters used in the Ascom hub and even tried adjusting each one to no avail. The home position magnet is set properly and it syncs to home.
How should I go about troubleshooting this problem? Is there one parameter I should be looking at? Any help would be appreciated.
Alex
There might be a way to figure out something close enough to get you going.
Go to the home position. then do a goto to the opposite side (so 180º appart).
Then measure by how much it is off.
Let's call this D.
We know that the default value is 55080 full steps per 360º.
So if you multiply D by 2 this gives you how much off you are in relation to a full rotation.
Then you can do (55080/360) * (360+(2*D)) , this is the actual number of steps per rotation you need to set on your controller.
The accuracy is tied to how accurately you can measure the offset.
That's the best I can come up with as there is no calibration command on the 3.x firmware (and 4.x).
Rodolphe