Thanks...I looked on my Chrystals in both the Reciever and the Transmitter for my Lanyu system.. BOTH chrystals say...27.095 MHZ and both were marked RX.. Someone blacked out the RX on the transmitter one but they are idential. This is NOT what I know as normal and you just verified that for me... I can change the chrystals from the transmitter to the reciever and from the reciever to the transmitter and the radio works either way.. I understand what you said but this system seems to be different than what you described.. I have never seen one that interchanges chrystals from TX to RX before and frnakly, I am puzzled.. This Radio TX and RX is fairly new to the states and I find very little info on this system.. I love the way it feels in my hands and wish to change all my planes over.. I can buy more recievers for 10 bucks with NO chrystals.. I have not found anyone selling chrystals for this set.. I wonder if TWO TX chrystals from another 27mhz MF would work.. I have not tried that yet.. DOES anyone else have a LANYU 4 channel system or any knowledge of them..? Where can I find Lanyu chrystal sets for my new recievers ? Thanks, Chief.