Posting on this thread because I’m building an AT with the PT785-S pan/tilt set up as well. I’m using a pixracer as the control board. After having a few issues with the set up process and getting through that, now I’m having difficulty tuning the system with the multi-rotation servos on the PT785 (HS-785HB servos). The system will yaw and pitch no problem with the test button in the extended-tuning page, but I cannot send PWM signals <1100 or >1900 so there’s no way to test the multi-rotation. It also doesn’t rotate a full 360º, just about 330º. When the tracker is in Auto mode it will yaw fine until it reaches the end of its first rotation, then it just gets stuck there shaking back and forth, it never reverses back around the other way at all. When this happens it pitches over past 90º (despite the limit I have set in the tuning page) and points at the drone upside down.
I think it’s an issue with the way the servos respond to the PWM output of the pixracer but I don’t know enough about any of this to work out how to fix it. I’ve tried tuning the PID values and this reduces the amount of shake but doesn’t send the yaw back in the other direction, nor continue around past about 330º.
I’m hoping someone out there has been successful with the PT785-S and can help me out, especially as it’s one of the systems suggested on the antenna tracker page.