So the past few times Ive flown my APM/3DR Quad Copter my gimbal stab. system will twitch left and right a few times for a few seconds every couple of seconds. Now this twitch only happens on my tilt (left/right) servo, and i have tried to swap old servos with new servos and im still getting the same twitch. This twitch also happens in flight, and before/after flight on the ground or in the air. Has anyone had this issue before what can I do to correct this issue?
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I had servo twitching due to 915mhz telemetry radio interference. If you have the telemetry radio - unplug it from the APM and see if your servo twitching goes away. If this is the problem you can try moving wires etc. to see if you can make it better. I fixed my problem by adding a small capacitor 33pf or so inside my servos between the signal lead and ground.