Hello, i live in Europe where the official air frequencies are on 35mhz. However, i own a 6EXA on 72mhz (from USA). I would like to know if i can connect a 72mhz 6EXA to a 35mhz 6EXA for training purposes. I want the 35mhz set to be the "buddy box". Will there be any problem with the different frequencies or not? Thank you.