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Radio transponder

12:53

Satellite Communication - Transponders

20:52

Aircraft Transponder; What is it for? How does it work?/Aviation explained

5:53

Radar and Transponders

3:19

Ignition Key Transponders

6:37

Transponder Keys Explained

In telecommunication, a transponder can be one of two types of devices. In air navigation or radio frequency identification, a flight transponder is an automated transceiver in an aircraft that emits a coded identifying signal in response to an interrogating received signal. In a communications satellite, a satellite transponder receives signals over a range of uplink frequencies, usually from a satellite ground station. The transponder amplifies them, and re-transmits them on a different set of downlink frequencies to receivers on Earth, often without changing the content of the received signal or signals.
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