Well sometimes it tries to arm soon as its turned on, but mainly i simply cannot arm is. Ive run the calibraiton in mission planner for the tarannis, seems fine. I press and hold the safetly button to begin arming, that seems ok, then I try to arm with the Tarannis, but nothing happens. Not even the tpyical sound that plays when it fails to arm.
BTW in this video (made for another post) you can hear the beeping I am talking about: