"I've found that AMP Planner 2.0 on my Mac doesn't do a good cal. I switched to Mission Planner on a Windows machine and got a better cal after upgrading to 3.2 on my Pixhawk.
Louis"
"Angelo,
I have had problems with compass cal on my Pixhawk running 3.2 (Pre-arm check compass cal error) until I did the cal on a Windows machine using Mission Planner and not on my Mac using APM Planner 2.0. For some reason I could not get a…"
"James,
Because the 4DR-II is used in the CPPM output mode connected to the Pixhawk, you already have 8 channels on that radio. So there is no need to switch if you need a few extra channels. Hope this helps.
Louis"