Hi everybody,

first of all I have to say thanks for such a great threat you did here! Amacing how many people work so hard one this project.

Iīm really interessed to build also my own transponder, so I have some questions I could answer myself in this threat. Maybe some off you guys can help me with you experience.

I would like to use a transponder of a full size cross car. So the distance between the loop an the transponder will be anround 1 meter. In #332 I read that the distance is ambout 15 cm. Is there a way to improve the distance? What are the parameters to play with?
Is there a difference in using a coil induction instead of the onboard induction? In this case I could save some space and could chance the direction of the transponder to the ground (So the PCB not need to be perpendicular to the ground).

Iīm already working at a transponder for a half year but I had a different approach because I couldīt find the way professional transponders work till now

I was using the loop as an transmitter with an tone of 8 kHz and 24 V. With the transponder Iīm able to detect this tone by FFT. When the transponder detect the loop it send itīs ID via a rf 433 MHz Module to the Timing PC. It is working ok for now but itīs kind of "I donīt know what Iīm doing" approach.

Since I try to build the hole system, I donīt have to be compatible to other systems.
So I hope with a little help I can design a real transponder. Already thanks for the great support!

Edit: would it be possible to use hf transistors behind the uib and uic to use higher voltage to improve the distance?