I am interested to know what is in the timing transponders (for remote controlled cars or karts) and how they actually work. There are relatively few manufacturers and the prices are rather high!
The basic idea is that you have a loop of coax in the ground with a resistor half-way (more info halfway down here). Even this loop of coax costs an extortionate amount from the suppliers
So I was wondering how the magnetic inductance works to send a digital ID. I am interested in building something for less than the few hundred $ the transponders sell for. I know that DIY timing can be done with IR or other methods but want to know if building some sort of transponder system is possible first.
The basic idea is that you have a loop of coax in the ground with a resistor half-way (more info halfway down here). Even this loop of coax costs an extortionate amount from the suppliers
So I was wondering how the magnetic inductance works to send a digital ID. I am interested in building something for less than the few hundred $ the transponders sell for. I know that DIY timing can be done with IR or other methods but want to know if building some sort of transponder system is possible first.