I brought a 9Ch transmitter and receiver out of the USA (I live in New Zealand) and it had a cyrstal in it that was not legal in New Zealand (72.350or similar I think) so I changed the crystal. I brought a 72.110 which is legal over here and put it in and it seems to work ok. Is this all I need to do and will it work ok. I have done a range test and flown the heli and everything is fine but some people have told me it might need to be retuned. Is this nessacery in the 9C range or not. Dont they just come with low or high range modules and you just change the crystal to suit or is there limitations of what amount of frequency range you can play with. Do the recivers accept ANY range of cyrstals or are they limited to anything????