Just a comment from me. I’ve owned an Alfa Spid RAS for several years and it always lost its position, once wrapping the coax twice around the mast before it snapped. I changed to a 18vdc supply and all the problems went away. Calibration is a once every few months check. I now also own a Spid ( not the Alfa Spid ) Big Ras/HR, driving a 3 mtr mesh dish and the motor runs on the 26vdc supply and the controller on a 16vdc supply, both homebrew. No problems at all so far . I’ve been told many times that the Alfa Spid is a copy and isn’t as reliable as the genuine Spid, whether thats true or not I don’t know, but both mine are doing what I want them to do. I did consider the Green Heron controller as we use several of them at our radio club, but so far the originals are behaving well. I suppose there are good and bad ones out there :( Cheers Keith Keith Bainbridge VK6KB / VK6EME _______________________________________________ Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html