I just thought of something. Is it possible that the problem is in a setting in the BGC GUI software? Should I be using PWM? Analog? PPM-Sum? The default is PWM. Is that the correct setting?
I am not using the Roll/Pitch servo connections. The wiki article didn’t say to do that. I soldered to the board, per the image https://ardupilot.org/copter/_images/simplebgc-gimbal-pixhawk.png
According to the post at Simple BGC gimbal control and 3.6 - #5 by Vince_Hogg, the Tx and Rx pins might need to be switched? I have the Tx from UART4 going to the Rx on the gimbal controller, and the Rx from UART4 going to the Tx on the gimbal. Is it supposed to be backwards, like Rx to Rx and Tx to Tx?
Also did I post this in the wrong forum? I see there’s a osd/video forum, but it contains some gimbal discussion as well. Am I in the wrong place?