Transponder

In telecommunication, a transponder is one of two types of devices. In air navigation or radio frequency identification, a transponder is a device that emits an identifying signal in response to an interrogating received signal. In a communications satellite, a transponder gathers signals over a range of uplink frequencies 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.

The term is a portmanteau for Transmitter-responder. It is variously abbreviated as XPDR, XPNDR, TPDR or TP).

Read more about TransponderSatellite/broadcast Communications, Optical Communications, Aviation, Marine, Automotive, Road, Motorsport, Underwater, Gated Communities

Other articles related to "transponder, transponders":

Aviation Transponder Interrogation Modes
... An aviation transponder interrogation mode is the format of a sequence of pulses from an interrogating SSR radar, or similar system, and reply format usually ...
Transponder (satellite Communications)
... A communications satellite's transponder, is the series of interconnected units which form a communications channel between the receiving and the transmitting antennas ... A transponder is typically composed of An input band limiting device (a band pass filter) An Input low-noise amplifier (LNA), designed to amplify the (normally very weak, because of the large distances ... Most transponders operate on a "bent pipe" principle, sending back to earth of what goes into the conduit with only amplification and a shift from uplink to downlink frequency ...
Lifestyle (TV Channel)
... daytime television channel dedicated to women and family, and was broadcast on cable and on transponder 5 of the Astra satellite from 1989 ... In 1990, from 11pm to 6am the transponder was used to broadcast the Lifestyle Lifestyle Satellite Jukebox, a music video request channel which also ended in 1993 ... For a time, The Children's Channel also transmitted on transponder 5, airing during the early morning before Lifestyle programming started ...
Anti-hijack System - Technology - Transponder
... A transponder system is a system which is always armed until a device, usually a small RFID transponder, enters the vehicle's transmitter radius ... pocket, if the driver leaves the immediate vicinity of the vehicle, so will the transponder, causing the system to assume the vehicle has been hijacked and disable it ... As the transponder itself is concealed, the thief would not be aware that such a system is active on a vehicle until they had ejected the driver and moved the ...
Transponder - Gated Communities
... Transponders may also be used by residents to enter their gated communities ... However, having more than one transponder causes problems ...