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How It Works Transponder
How It Works Transponder
Published: 2015/05/04
Channel: shidifu111
Radar and Transponders
Radar and Transponders
Published: 2011/09/15
Channel: flyngo
Ignition Key Transponders
Ignition Key Transponders
Published: 2010/06/04
Channel: ADPTraining
Zombies In Spaceland Glitches: Unlimited M1 & hailstorm Ammo With Transponder - Infinite Warfare
Zombies In Spaceland Glitches: Unlimited M1 & hailstorm Ammo With Transponder - Infinite Warfare
Published: 2017/04/05
Channel: z CerealGlitchers
Transponder Chip Key Bypass How To For Any Car!
Transponder Chip Key Bypass How To For Any Car!
Published: 2013/07/26
Channel: Lessco Electronics
How to Bypass The Key Chip Transponder In Any Car Or Truck In 5 Minutes !!!
How to Bypass The Key Chip Transponder In Any Car Or Truck In 5 Minutes !!!
Published: 2016/11/24
Channel: Nathan's DIY Garage
Transponder Keys Explained
Transponder Keys Explained
Published: 2013/01/23
Channel: Mobile Edge
A2A C172 Avioncs Tutorials:  Transponder
A2A C172 Avioncs Tutorials: Transponder
Published: 2013/12/03
Channel: A2A Simulations
Diagnostico de llaves con transponder e inmovilizadores y controles remoto automotrices
Diagnostico de llaves con transponder e inmovilizadores y controles remoto automotrices
Published: 2016/03/18
Channel: Electronica y Servicio
Transponder Chip Key Bypass How To For Any Car
Transponder Chip Key Bypass How To For Any Car
Published: 2014/09/08
Channel: PriorToImpact
How to make a cheap transponder key bypass
How to make a cheap transponder key bypass
Published: 2011/10/22
Channel: Lessco Electronics
How to bypass Transponder Key(Temp Fix)- Free and Easy
How to bypass Transponder Key(Temp Fix)- Free and Easy
Published: 2010/04/28
Channel: drummer2290
Mylaps X2 Transponder Activation Process - Windows - Mylaps Connect 3.0
Mylaps X2 Transponder Activation Process - Windows - Mylaps Connect 3.0
Published: 2017/02/01
Channel: John Dains
How to program Ford transponder key
How to program Ford transponder key
Published: 2015/02/13
Channel: TheFordman444
Transponder - Bad Blue Boys
Transponder - Bad Blue Boys
Published: 2016/05/02
Channel: Transponder
Intro RFID Transponder Technology
Intro RFID Transponder Technology
Published: 2015/07/03
Channel: Elatec RFID Systems
Tricking (disabling) factory transponder anti theft system with an aftermarket databus bypass module
Tricking (disabling) factory transponder anti theft system with an aftermarket databus bypass module
Published: 2014/06/19
Channel: Lessco Electronics
How car key / transponder key copying is done? - Barrenjoey Locksmith
How car key / transponder key copying is done? - Barrenjoey Locksmith
Published: 2014/01/24
Channel: Barrenjoey Locksmiths & Alarms
How to extract Ford Transponder
How to extract Ford Transponder
Published: 2012/08/09
Channel: Flip Keys
KENNEDY STEVE: BANG THE TRANSPONDER!
KENNEDY STEVE: BANG THE TRANSPONDER!
Published: 2017/06/23
Channel: H89SA
O QUE SÃO OS TRANSPONDERS (TPS) E FREQUENCIA DE LNB
O QUE SÃO OS TRANSPONDERS (TPS) E FREQUENCIA DE LNB
Published: 2016/02/12
Channel: Panda Pr
How to properly install your Ohio E-ZPass Transponder
How to properly install your Ohio E-ZPass Transponder
Published: 2015/01/28
Channel: Ohio Turnpike
Ignition Key Transponder Detector
Ignition Key Transponder Detector
Published: 2012/11/17
Channel: ADPTraining
How to Disable the Transponder Key Video
How to Disable the Transponder Key Video
Published: 2014/05/18
Channel: Karima Fezz
Clonagem de chave transponder usando mini zed bull
Clonagem de chave transponder usando mini zed bull
Published: 2016/08/09
Channel: Chave Digital
AVIÃO   ATC TRANSPONDER  VIDEO # 50
AVIÃO ATC TRANSPONDER VIDEO # 50
Published: 2016/10/10
Channel: AVIÕES & CIA
Zombies In Spaceland Glitches: How To Duplicate "Rewind Grenade/Transponder" - Infinite Warfare
Zombies In Spaceland Glitches: How To Duplicate "Rewind Grenade/Transponder" - Infinite Warfare
Published: 2017/03/08
Channel: ChadderManHD
Como retirar o Transponder (Chip Conde) da chave do Celta
Como retirar o Transponder (Chip Conde) da chave do Celta
Published: 2016/08/25
Channel: Adelino S. Palmeira
FAZENDO CÓPIA DE CHAVE COM TRANSPONDER - CHAVEIRO ERNESTO
FAZENDO CÓPIA DE CHAVE COM TRANSPONDER - CHAVEIRO ERNESTO
Published: 2016/03/25
Channel: Chaveiro Ernesto
Zombies In Spaceland Glitches: Unlimited M1/Hailstorm Ammo (Transponder) - Infinite Warfare
Zombies In Spaceland Glitches: Unlimited M1/Hailstorm Ammo (Transponder) - Infinite Warfare
Published: 2017/04/06
Channel: ChadderManHD
VW Key Transponder Programing
VW Key Transponder Programing
Published: 2014/05/23
Channel: canadacatalyst
Zombies In Spaceland: Ontop of The Map Glitch - Easy Transponder Glitch Cod IW Zombies
Zombies In Spaceland: Ontop of The Map Glitch - Easy Transponder Glitch Cod IW Zombies
Published: 2017/02/15
Channel: z CerealGlitchers
DIY: How to Reprogram a Transponder Key
DIY: How to Reprogram a Transponder Key
Published: 2015/09/30
Channel: Northern Group Locksmith
Clonagem de transponder quando da bronca Vamos resolver
Clonagem de transponder quando da bronca Vamos resolver
Published: 2016/09/06
Channel: Chave Digital
Tutorial que es un codigo squawk o transponder FSX
Tutorial que es un codigo squawk o transponder FSX
Published: 2012/06/02
Channel: Painful max
HOW TO EXTRACT TRANSPONDER (SENSOR,IMMOBILISER, CHIP) FROM A NISSAN KEY
HOW TO EXTRACT TRANSPONDER (SENSOR,IMMOBILISER, CHIP) FROM A NISSAN KEY
Published: 2016/03/07
Channel: Nelio Alves Abreu
How to fix a dead AMB MyLaps transponder (AMB Tranx160 / MyLaps Tranx260 )
How to fix a dead AMB MyLaps transponder (AMB Tranx160 / MyLaps Tranx260 )
Published: 2013/03/10
Channel: TeamBastardoRacing
First Bay Locksmith - Honda transponder key
First Bay Locksmith - Honda transponder key
Published: 2013/02/28
Channel: chen even
Ford Transponder Programmer 15 Sec No Key needed
Ford Transponder Programmer 15 Sec No Key needed
Published: 2013/11/19
Channel: anon ymous
Mylaps X2 Direct Power Transponder troubleshooting
Mylaps X2 Direct Power Transponder troubleshooting
Published: 2016/04/17
Channel: John Dains
Using an E-ZPass transponder incorrectly will rack up fees
Using an E-ZPass transponder incorrectly will rack up fees
Published: 2016/10/26
Channel: WWLP-22News
Transponder Requirements
Transponder Requirements
Published: 2015/10/10
Channel: Mathieu Grassi
L 3
L 3's Upgraded Lynx ADS B Transponder
Published: 2017/03/14
Channel: AVweb
Giant Sand - Transponder
Giant Sand - Transponder
Published: 2015/05/03
Channel: DustyRoadBoy
COMPATT Sonar transponder teardown
COMPATT Sonar transponder teardown
Published: 2012/08/20
Channel: mikeselectricstuff
Zombies in Spaceland: ONLY Working Transponder Out Of Map After Patch 1.12 - Cod Infinite Warfare!?
Zombies in Spaceland: ONLY Working Transponder Out Of Map After Patch 1.12 - Cod Infinite Warfare!?
Published: 2017/03/31
Channel: Silent Nine
Installing Your ExpressToll Transponders
Installing Your ExpressToll Transponders
Published: 2015/09/10
Channel: E-470 Public Highway Authority
The KT 74 Mode S Transponder from BendixKing by Honeywell
The KT 74 Mode S Transponder from BendixKing by Honeywell
Published: 2013/10/28
Channel: Bendix King
Transponder Mounting for Your Drone Racer
Transponder Mounting for Your Drone Racer
Published: 2015/11/17
Channel: travisgrindal
How to config Transponder ID on Piko BLX
How to config Transponder ID on Piko BLX
Published: 2017/05/17
Channel: FURIOUS FPV
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WIKIPEDIA ARTICLE

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A Highway 407 toll transponder

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, 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.

The term is a portmanteau for transmitter-responder.[1] It is variously abbreviated as XPDR, XPNDR, TPDR or TP.

Satellite/broadcast communications[edit]

A communications satellite’s channels are called transponders because each is a separate transceiver or repeater. With digital video data compression and multiplexing, several video and audio channels may travel through a single transponder on a single wideband carrier. Original analog video only has one channel per transponder, with subcarriers for audio and automatic transmission identification service (ATIS). Non-multiplexed radio stations can also travel in single channel per carrier (SCPC) mode, with multiple carriers (analog or digital) per transponder. This allows each station to transmit directly to the satellite, rather than paying for a whole transponder, or using landlines to send it to an earth station for multiplexing with other stations.

Optical communications[edit]

In optical fiber communications, a transponder is the element that sends and receives the optical signal from a fiber. A transponder is typically characterized by its data rate and the maximum distance the signal can travel.

The term "transponder" can apply to different items with important functional differences, mentioned across academic and commercial literature:

  • according to one description,[2] a transponder and transceiver are both functionally similar devices that convert a full-duplex electrical signal into a full-duplex optical signal. The difference between the two is that transceivers interface electrically with the host system using a serial interface, whereas transponders use a parallel interface to do so. In this view, transponders provide easier-to-handle lower-rate parallel signals, but are bulkier and consume more power than transceivers.
  • according to another description,[3] transceivers are limited to providing an electrical-optical function only (not differentiating between serial or parallel electrical interfaces), whereas transponders convert an optical signal at one wavelength to an optical signal at another wavelength (typically ITU standardized for DWDM communication). As such, transponders can be considered as two transceivers placed back-to-back. This view also seems to be held by e.g. Fujitsu.[4]

As a result, difference in transponder functionality also might influence the functional description of related optical modules like transceivers and muxponders.

Aviation[edit]

A bumblebee worker with a transponder attached to its back

Another type of transponder occurs in identification friend or foe systems in military aviation and in air traffic control secondary surveillance radar (beacon radar) systems for general aviation and commercial aviation. Primary radar works best with large all-metal aircraft, but not so well on small, composite aircraft. Its range is also limited by terrain and rain or snow and also detects unwanted objects such as automobiles, hills and trees. Furthermore, it cannot always estimate the altitude of an aircraft. Secondary radar overcomes these limitations but it depends on a transponder in the aircraft to respond to interrogations from the ground station to make the plane more visible.

Depending on the type of interrogation, the transponder sends back a transponder code (or "squawk code", Mode A) or altitude information (Mode C) to help air traffic controllers to identify the aircraft and to maintain separation between planes. Another mode called Mode S (Mode Select) is designed to help avoiding over-interrogation of the transponder (having many radars in busy areas) and to allow automatic collision avoidance. Mode S transponders are backward compatible with Modes A and C. Mode S is mandatory in controlled airspace in many countries. Some countries have also required, or are moving towards requiring, that all aircraft be equipped with Mode S, even in uncontrolled airspace. However, in the field of general aviation there have been objections to these moves, because of the cost, size, limited benefit to the users in uncontrolled airspace, and, in the case of balloons and gliders, the power requirements during long flights.

Marine[edit]

The International Maritime Organization's International Convention for the Safety of Life at Sea requires the Automatic Identification System (AIS) to be fitted aboard international voyaging ships with gross tonnage (GT) of 300 or more, and all passenger ships regardless of size.[5] Although AIS transmitters/receivers are generally called transponders they generally transmit autonomously, although coast stations can interrogate class B transponders on smaller vessels for additional information. In addition, navigational aids often have transponders called RACON (radar beacons) designed to make them stand out on a ship's radar screen.

Automotive[edit]

Many modern automobiles have keys with transponders hidden inside the plastic head of the key. The user 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.

Road[edit]

Electronic toll collection systems such as E-ZPass in the eastern United States use RFID transponders to identify vehicles. Highway 407 in Ontario is one of the world's first completely automated toll highways.

Motorsport[edit]

Transponders are used in motorsport for lap timing purposes. A cable loop is dug into the race circuit near to the start/finish line. Each car has an active transponder with a unique ID code. When the racing car passes the start/finish line the lap time and the racing position is shown on the score board.

Passive and active RFID systems are used in off-road events such as Enduro and Hare and Hounds racing, the riders have a transponder on their person, normally on their arm. When they complete a lap they swipe or touch the receiver which is connected to a computer and log their lap time. The Casimo Group Ltd make a system which does this.

NASCAR uses transponders and cable loops placed at numerous points around the track to determine the lineup during a caution period. This system replaced a dangerous race back to the start-finish line.

Underwater[edit]

Sonar transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and navigation.

Gated communities[edit]

Transponders may also be used by residents to enter their gated communities. However, having more than one transponder causes problems. If a resident's car with simple transponder is parked in the vicinity, any vehicle can come up to the automated gate, triggering the gate interrogation signal, which may get an acceptable response from the resident's car. Such units properly installed might involve beamforming, unique transponders for each vehicle, or simply obliging vehicles to be stored away from the gate.

See also[edit]

References[edit]

External links[edit]

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