The Proxmark3 PCB 125kHz antenna., GNU GPL version 2 ... and one of the parts we end up talking about is its built-in 125 kHz RFID reader. It’s a surprisingly complex circuit with a lot of ...

For example, 125 kHz tags have an antenna made from many turns of very fine wire, with no visible space between the loops. High-frequency tags on the other hand will have antennas with fewer loops ...