I am just wondering what frequency crystals would work on a Smartech 2channel radio system (originally 27mhz. I hooked up 75mhz crystals but they dont work at all. Is there anything i have to do to make them work or does this radio only work with 27mhz crystals. My friend has the exact same car and we want to race, that will never work with the same radio frequency. Any suggestions? Thanks a ton...