transponder?

16th February 2010, 01:58

hello all, as titled what is a transponder? thnaks

16th February 2010, 14:33

transponder (short-for Transmitter-responder).
Many modern cars have keys with transponders hidden inside the plastic head of the key. The owner of the car may not even be aware that the transponder is there because there are no buttons to press. When a key is inserted into the ignition lock cylinder and turned, the car's computer sends a radio signal to the transponder. Unless the transponder replies with a valid code, the computer will not allow the engine to be started. Transponder keys have no battery; they are energized by the radio signal itself.

transponders are also used in timing devices on race cars and bikes to show the lap time etc.

transponders for timing will also need a computer to show the information on you can also set the transponder to allow the number of laps the car is aloud to do before it stops recording a time.

i know because i used to work at a go-karting track and all the karts had ponders on them