Pixhawk/Dragonlink bad servo twitch

Hello all, I was just wondering what's going on with my setup.  I'm using a Dragonlink ver. 2 Tx and Rx.  PPM output channel 12 to the pixhawk and in manual mode, the servos are very erratic and twitching violently.  I am quite perplexed... Any idea what it could be?  I'm still setting it up so FPV video is not running.  The only Tx running is the Dragonlink... 

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                • Well the Rx (when it's bound to use regular PWM) works fine with servos directly plugged in and the servos move smoothly.  When it's bound as PPM output on channel 12 and attached to the pixhawk, the servos twitch a lot.

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