Why don't you buy just buy a 4 channel Futaba trainer TX off of ebay they are cheap and then you will always have it if you need to train somebody else.You will need to still buy the cord. I think this is compatible with the radio you have. I would ask the buyer I have bought a few items from him he is good to deal with.
http://cgi.ebay.com/Brand-New-Futaba...item3f0babfed8