I bought a used radio setup a few weeks ago it is on channel 18. I was at the field of the club that Im going to join and talking to one of the members he said don't buy a radio on channel 18 because some where around there someone is using channel 18.....JUST MY LUCK!!!!!! I went to Tower Hobby web site and they dont have crystals for JR anyone know where I can get them........Bob

Its illegal to change transmitter crystals w/o having the radio checked by a repair station like Horizon Hobby or Radio South.

Absolutely, it's illegal for the end user to change the crystals in their transmitter. It needs to be sent to a repair center to have them changed.

Ken

Is Radio South and Horizon the only people that do it?

There are probably service centers throughout the country. This one is in Fort Worth Texas
http://www.dumondrc.com/
Check with the hobby shops in your area. If there's someone local they should know.