I have a new Spektrun DX3R.
The controls ( servos) are not smooth, they are " step-jump", no precision.
Servos are new Savox.
Tried with 5.5 and 12(?) frame rate..
When I check ate the monitor function in the Tx, the values also goes from big steps..
In stearing I only have 6 diferent points.
Does anybody have a clue?
Thanks.
Mario.

At first thought, do you have analog setting and digital servo or vice cersa? I have experienced some strange things on my Futaba 4PK when this wasn't adjusted right. Just a thought

Try recalibrating the transmitter’s potentiometers. If I remember correctly it goes something like this:

Reset > Parameters, then turn full right, left, full throttle, brake, >Save

It’s covered towards the back of the manual, under Reset.