I assume you are talking about moving the reciever from the Hobbico Trainer to the Ultra-Stik. Since you didn't specifically mention which reciever you're using, I'm going out on a limb to say you should be fine. Read the manual on how to set things up. You said you're using the reciever from a wrecked trainer. If the reciever is either Futaba or Hitech, you should have no problems with the transmitter, but you'll need to make sure you purchase a reciever crystal to match the transmitter frequency. Since its coming from a wrecked trainer, inspect it very carefully for any signs of damage. If you have reason to suspect it, either send it to the manufacturer or just buy a new receiver.

Brad