Well,

Thank you all very much for your precious advices regarding this, Im gonna send this to the Horizon hobby people, Im sure they're gonna find out what could have been the real problem, but your feed backs did help me out a lot. I also have a practice to keep my receiver away from the vibrations in so I keep it in the rubber padding which comes with Electron 6 of Hitec and cover it with styrofoam so, it keeps it quite safe in it. I have one question more to you Bruce, I heard about Rx that negative shift and positive shift, what is the difference between both and how do they really work?

Thanks

Mody