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it's the crystal that tunes the frequncy of the transmitter and the coil that tunes the reciever.
if the frequency of the transmitter can be changed by changing the frequency, theoreticaly, the reciever can be changed by changing the coil.
and to change the coil, I was thinking of making sort of like a socket in the car and just plugging in the coil and a switch in the controller.
I would like to use a switch in the car, but there are too many wires that go to/from the coil, that's why I was thinking of a socket approach to changing the coil
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