You may want to read Part 2 and Part 90 of the FCC Rules and Regulations. They can be found on the Electronic Code of Federal Regulations web site at: http://www.ecfr.gov/cgi-bin/text-idx?&tpl=/ecfrbrowse/Title47/47cfr2_mai... http://www.ecfr.gov/cgi-bin/text-idx?tpl=/ecfrbrowse/Title47/47cfr90_main_02...
Part 2 is the general rules for all services and Part 90 is the Private Land Mobile Radio Services rules.
90.427 says "...no person shall program into a transmitter frequencies for which the licensee using the transmitter is not authorized."
Tom
Thanks, also, for this warning. It never even occurred to me that reprogramming these radios might be illegal. I'll pass this one. Do you know of any pointers to documents on the Web that might be useful to read concerning this issue?