The laws governing this issue are in place, and were posted earlier. It is very illegal to make this change. Opjose has listed some of what could happen in regards to RC planes if you make this change. But here are more things that could happen. The frequencies that we use (for free) are very close to other frequecies that are in use in which the owners have payed for use of those frequencies. One that comes to mind quickly is television channel #4, but there are others as well. If you change the crystal on your radio and interfere with their broadcast the FCC will more than likely be looking for who is causing the interference. The fines for this are $10,000 per incident.

Ken