Here are some suggestions:
- Make sure you have "Heli" selected as model type on your radio. ("Plane" generally doesn't work so well).
- If you're having trouble with calibration using USB/dongle, make sure you uninstall vJoy and Smartpropoplus if you have them. I think it installs a driver that messes with things.
- Make sure you don't have any other joysticks/controllers connected, that might cause a conflict.
- If you are using a USB dongle - check if there's a switch on the dongle where you can select different modes.
- Perhaps you can remap the output channels (in the menu of the transmitter) so that it sends to another channel.
If none of the above works you could try to connect an ordinary 3.5mm audio cable from the trainer port of the transmitter to the audio-in (or mic-in) jack of your computer, along with a software called Smartpropoplus.
http://www.smartpropoplus.com/site/
There is more info on that in the Spektrum setup tips document: