ORIGINAL: coriolan
....The only band where crystal change is legal (US,Canada)in Tx and Rx is 27Mhz because of the wide spacing between channels....
Please read the FCC rules and bulletins! This is the biggest myth in RC!
The FCC says crystals, repairs and mods to transmitters
should be done by qualified persons. It is a recomendation, not law, and the "qualified person" isn't defined, so that is a vague term that could be anything from an electronics tech to an experienced RCer.
This has never ever been enforced by the FCC. Ever!