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Post: There are a few possible causes for jitter on an RC servo. The output pulse width from the servo pi could be between two positions on the servo making it try to jump backwards and forwards between the two locations. If you are using the Servo class in our [url=https://github.com/abelectronicsuk/ABElectronics_Python_Libraries/tree/master/ServoPi]Python library[/url] you could try changing the number of steps in the move command or changing the minimum and maximum limits and see if that fixes the issue. Also, try moving the position one or two steps in either direction and see if the jitter stops. Voltage spikes or drops on the power supply could cause a servo jitter. When the servo moves there will be an increase in the current draw on your power supply which could cause a small drop in the supply voltage. You could try adding a 220uF capacitor across the power pins on the servo to smooth the power input. Another possible cause for the jitter is noise on the signal cable going to the servo. If the cable is picking up noise from an external source that could confuse the position circuit in the servo making it jittery. Try adding a 10nF capacitor between the signal pin on the servo and ground and see if that helps.