helicopter throttle control??

[shoffman`]

I built an interface that I found at:
I'm using a 5 channel JR XF421 radio. The fixed wing craft work fine but I'm having trouble with the helicopters. I cant seem to get any kind of throttle response. I've tried several combinations in the set up/calibration mode. I can get the helicopter to hover, roll, pitch, and rotate, but can't get much altitude because I can't increase the throttle. Any help would be appreciated. P.S. What is "Nick" ...??