My HS-7955TG jitters when I turn on the TX... why?

[Nixpus]

Hola amigos!

I just tried to setup my TX/RX and servo for a Savage build... unfortunately the servo start to jitter and is noisy when I turn the TX on :(

The TX/RX combo is this one from HK: http://www.hobbyking.com/hobbyking/s...dProduct=16199

The servo is this oe from Hitec: http://www.hitecrcd.com/products/dig...hs-7955tg.html

It must be related to the servo being digital... since my old analogue acoms servo is silent and jitter free when i plug it into the RX and turn on the TX.

The jittery behaviour is without any load.

Any help would be greatly appreciated :)