sorry, waterskier, you aren't making sense. When you buy a radio system it includes transmitter and receiver and both crystals already installed and properly tuned in both. You dont then need to buy other crystals, they're already in the system. Perhaps it would be best for you to call hobby people and talk through what you're ordering with someone there to ensure you're getting just what it is you want/need.

Sincerely,
AnnMarie Cross
President
Crosswinds Equine Rescue, Inc
http://www.crosswindseqresq.org/