you can change tx crystals in fm radios right??
The modules allow you to change mhz. like 72- 27- 75mhz, I'm assuming your running a gas car or truck. Speeding is illegal but at roar events it is common practise to change your crystals for the next race. You actually have to give your alternate crystal #'s when you sign up. Your lynx 3d has the ability to change between 75-27 mhz by changing the module, you may also replace the module with novaks or hitecs synthesized module that allows you to dial a frequency.