The links posted above look great, but I'll just add an ultra-primitive method I've used to dehydrate:
Make a campfire and find a wide, pyramid-shaped rock. Push one end of the rock into the fire, and stick thin meat slices to the side facing away from the fire. This should dry them out fairly quick.
Test the rock with your finger frequently; if it hurts to touch, then it's too hot. You don't want it so hot it cooks the meat.
As always, cut the meat as thin as possible and trim off all fat.