Bad response from Walkera radio.

[Nandox7]

Hi,

i've setup my walkera TX with the com cable that came with it, to use in FMS.
I can put it to work, with no problem.
The real problem is using it, even after the calibration process.
Using the TX is extremly difficult, i only half travel of a stick corresponds to the full movement detect by FMS.
Making very very difficult to control a plane/heli, everything...
A slight touch in the stick correspond to a huge movement in the machine, even activating the expo switch it doesnt matter a thing.

Does anyone have or had this problem? Or have any info on how to resolv this?

Thank you.