Here’s a video (there is no sound). It’s nearly 8 minutes long; the antenna starts pointing (roughly) at the horizon, rotates through 180 degrees, is taken up to the zenith and back again, rotates back through 360 degrees, then rotates to its starting position.
Right near the end I had to tighten the azimuth belt tensioner – it had slipped slightly. I will add captured washers to prevent slipping.
What fun! Next job is to try out an attitude sensor as position indicator. If it’s not good enough, I have the option to add encoders quite easily.