 This decoder identifies the unique transponder code and calculates the exact time when the transponder passes a timing point.Some implementations of timing systems require the use of a mat on the ground at the timing points while other systems implement the timing points with vertically oriented portals.RFID was first used in the late 1980s primarily for motor racing and became more widely adopted in athletic events in the mid-1990s upon the release of low cost 134 kHz transponders and readers from Texas Instruments.