I hate to see this happen to new guys. There is no way your buddy flew these birds with that transmitter and reciever combo. If he is disohonest enough to sell you that stuff claiming that it will work, then who knows what problems lurk in that setup? I would be honestly concerned that he has changed the transmitter crystal. If the sticker and the frequency marking don't match what the crystal says, then that is definitely the case and the radio will have to be sent off to have the frequency changed and retuned. Given the selloff that is happening right now with 72mhz stuff, it's probably not worth the expense.