pixhawk refusing to arm after ESC calibration
I'm swapping my 3dr quadcopter's APM 2.5 to a pixhawk.
I'm able to get through all the setup, and even the ESC calibration.
As the last step of the ESC calibration(http://copter.ardupilot.com/wiki/initial-setup/esc-motor/), i'm able to use my Spektrum
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