I'm new to RC and quadcopters and have successfully completed a scratch build that tuned up great and fly's beautifully. I'm just now setting up throttle failsafe, though, and noticed a problem that appears serious. When I test cut the transmitter power, yaw goes to max and throttle to low in Mission Planner. If I haven't armed, then the copter arms and if I am armed the throttle is cut to min, not a value below the minimum. Yaw goes high. Everything I've read suggests this should not be happening. Sorry if this is an obvious misunderstanding of the radio setup, but any ideas as to how to fix this would be appreciated. All Radio Calibration controls work as expected and calibration was successful.

Setup: APM 3.2.1, OrangeRX T-Six 6 Channel XMTR, OrangeRX 615X RCVR.

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