my question is this,when you order a radio from lets say tower?they ask you what channel,all they do is plug in a crystal and put a freq,sticker on the radio.that being said,who would know if you changed your transmitter freq?this is just a hypothetical question.its my understanding that these radios are either low band high band,and depending where you purchased it from,mode 1 or2.is there any internal number specifying it to be on the channel it was sent with?i might be wrong but will any high band crystal fit a radio that has that designation.and if you buy a second hand radio and the crystal was changed is it illegal to buy it?