I have a Lanyu Cessna 747. The transmitter feels good and the reciever looks good. It seems to have enough range..The problem is.. I just bought another Lanyu reciever and can't find Chrystals. I have a reciever chrystal on Channel 3 in an old Hobby Zone Swift with a burned out speed control.. HOWEVER.. that Chrystal is 26.640 mhz and is NOT on the same frequency as my Lanyu RX which is 27.095. I use a chrystal of 27.095 Mhz in my Lanyu reciever to match the Lanyu transmitter on 27.095 and they appear to be exactly alike.. I also have a set of Lanyu chrystals on 27.195 which arrived marked TX on each one yet they appear to work in either the RX or TX.. Is it common for BOTH the TX and RX to use the same frequency chrystals and for them to be interchangeable? IF so why does the HZ reciever use a different Freqency Chrystal than it's transmitter. I don't think the HZ transmitter will work with my Lanyu reciever either. It don't think I can use the HZ Chrystal in my Lanyu reciever..? Could it be the HZ is a duel and the Lanyu is a single conversion system?..Frankly I like the Lanyu better than my EFLY-100B. How common is it to use RX and TX chrystals interchangable ? It appears to work on my Lanyu system..Thanks..