Just received an FC90P dish and
SG2100 motor yesterday, and rather than rush to put the thing up, I decided to take some random measurements and do some experiments. I've started a web page, which I'll be adding to in the future, showing pictures of what I'm doing, ie:
http://eskerridge.com/bj/FC90-sg2100.html
However I thought I'd post a couple of the pictures here. First, I made some measurements to try to evaluate how accurate the latitude and elevation scales on the SG2100 motor are, and whether the motor shaft offset angle is actually 30 degrees as the specs say.
Well what I found is that first of all, the offset angle is indeed 30 degrees. Secondly, I found a flat surface on the motor, ie the surface just above the coax connectors, which is perpindicular to the rotation axis of the motor, where you can rest an inclinometer to verify settings. See below:
Note line "B" shows the rotation axis, line "A" is a crack in case perpindicular to this.
The above show a covenient surface for measuring angle perpindicular to the rotation axis.
Using this flat surface, I set up the motor elevation to correspond to a latitude setting of 44 deg and elevation of 46 degrees, then checked to see what the scales indicated. The elevation reading is shown below:
I've added a little line to the image to show where the proper angle seems to be indicated. The latitude scale seems to read at the same point, ie just forward of the little indicator point. But overall, the SG2100 motor angle scales seem to read fairly accurately, as others have suggested.
The forum software says I have too many images, so I'm going to continue this post in a second message dealing with the FC90P dish.