1
A2A C172 Avioncs Tutorials:  Transponder
A2A C172 Avioncs Tutorials: Transponder
DATE: 2013/12/03::
2
New Ignition Barrel and transponder bypass
New Ignition Barrel and transponder bypass
DATE: 2013/11/23::
3
Transponder Chip Key Bypass How To For Any Car!
Transponder Chip Key Bypass How To For Any Car!
DATE: 2013/07/25::
4
How to make a cheap transponder key bypass
How to make a cheap transponder key bypass
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5
Transponder Keys Explained
Transponder Keys Explained
DATE: 2013/01/23::
6
Dousat aumentar frequência e Qualidade do Transponder (Dousat Troy Hd - Deixa igual e veja)
Dousat aumentar frequência e Qualidade do Transponder (Dousat Troy Hd - Deixa igual e veja)
DATE: 2014/09/05::
7
How to bypass Transponder Key(Temp Fix)- Free and Easy
How to bypass Transponder Key(Temp Fix)- Free and Easy
DATE: 2010/04/28::
8
Ignition Key Transponder Detector
Ignition Key Transponder Detector
DATE: 2012/11/16::
9
Transponder Chip Key Bypass How To For Any Car
Transponder Chip Key Bypass How To For Any Car
DATE: 2014/09/07::
10
2012 ZED-Bull Transponder Clone car Transponder Key Programmer obd03.AVI
2012 ZED-Bull Transponder Clone car Transponder Key Programmer obd03.AVI
DATE: 2012/06/17::
11
Giant Sand - Transponder [Official Music Video]
Giant Sand - Transponder [Official Music Video]
DATE: 2015/05/12::
12
Giant Sand - Transponder
Giant Sand - Transponder
DATE: 2015/05/03::
13
How to extract Ford Transponder
How to extract Ford Transponder
DATE: 2012/08/09::
14
Auto Locksmith Tool AD90 P+ Key Transponder Programmer---OBDChina
Auto Locksmith Tool AD90 P+ Key Transponder Programmer---OBDChina
DATE: 2013/08/11::
15
How car key / transponder key copying is done? - Barrenjoey Locksmith
How car key / transponder key copying is done? - Barrenjoey Locksmith
DATE: 2014/01/24::
16
TRS-5000 EVO Maquina Transponder
TRS-5000 EVO Maquina Transponder
DATE: 2012/09/27::
17
How to Program a Ford Transponder key
How to Program a Ford Transponder key
DATE: 2012/04/23::
18
First Bay Locksmith - Honda transponder key
First Bay Locksmith - Honda transponder key
DATE: 2013/02/27::
19
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
DATE: 2014/06/19::
20
Skirting major Class C control zone; no transponder - Super Cub - Flying - ATC audio
Skirting major Class C control zone; no transponder - Super Cub - Flying - ATC audio
DATE: 2015/05/15::
21
When Do You Need A Mode C Transponder? - Day 25 #31DaySPC
When Do You Need A Mode C Transponder? - Day 25 #31DaySPC
DATE: 2013/01/30::
22
VW Key Transponder Programing
VW Key Transponder Programing
DATE: 2014/05/23::
23
transponder key bypass chipless
transponder key bypass chipless
DATE: 2012/03/12::
24
How to fix a dead AMB transponder (Tranx160 / Tranx260 )
How to fix a dead AMB transponder (Tranx160 / Tranx260 )
DATE: 2013/03/10::
25
Ignition Key Transponders
Ignition Key Transponders
DATE: 2010/06/03::
26
Hillman Automotive Transponder Key Cloning Tool EZ Clone Plus
Hillman Automotive Transponder Key Cloning Tool EZ Clone Plus
DATE: 2012/11/26::
27
The KT 74 Mode S Transponder from BendixKing by Honeywell
The KT 74 Mode S Transponder from BendixKing by Honeywell
DATE: 2013/10/28::
28
How to program a transponder key GM Chevy Buick Saturn Oldsmobile Pontiac Van
How to program a transponder key GM Chevy Buick Saturn Oldsmobile Pontiac Van
DATE: 2012/07/17::
29
How an aircraft
How an aircraft's transponder works
DATE: 2014/03/15::
30
Tutorial que es un codigo squawk o transponder FSX
Tutorial que es un codigo squawk o transponder FSX
DATE: 2012/06/02::
31
Extract Transponder Sensor from Toyota Key
Extract Transponder Sensor from Toyota Key
DATE: 2011/12/17::
32
West Marine AIS-1000 Class B Send and Receive AIS Transponder
West Marine AIS-1000 Class B Send and Receive AIS Transponder
DATE: 2009/11/12::
33
Astronote - Transponder
Astronote - Transponder
DATE: 2014/09/15::
34
Como se pide un codigo transponder al cruzar la frontera con Estados Unidos
Como se pide un codigo transponder al cruzar la frontera con Estados Unidos
DATE: 2014/06/04::
35
How to program a GM Chevrolet Pontiac GMC Buick Transponder Key
How to program a GM Chevrolet Pontiac GMC Buick Transponder Key
DATE: 2014/07/10::
36
The RCNetwork - My Laps RC4 Transponder un-boxing
The RCNetwork - My Laps RC4 Transponder un-boxing
DATE: 2012/11/26::
37
Ford Taurus PATS Transponder Key Programming Tutorial
Ford Taurus PATS Transponder Key Programming Tutorial
DATE: 2014/03/28::
38
Transponder Island BMW EWS and CAS Key Programming Class
Transponder Island BMW EWS and CAS Key Programming Class
DATE: 2015/05/12::
39
Disoriented Private Pilot forgets how to operate the transponder (ATC)
Disoriented Private Pilot forgets how to operate the transponder (ATC)
DATE: 2011/09/15::
40
Ignition Key Transponder Detector, How to Use
Ignition Key Transponder Detector, How to Use
DATE: 2012/11/18::
41
How to program a transponder key in a 2003-2006 Toyota 4runner
How to program a transponder key in a 2003-2006 Toyota 4runner
DATE: 2012/04/28::
42
How to program a transponder key for 2011 Nissan Rogue (Part 1/2)
How to program a transponder key for 2011 Nissan Rogue (Part 1/2)
DATE: 2013/05/30::
43
Zed Bull Key Programmer,Mini Zed Bull Key programmer,Zed-Bull Transponder Cloning car key programmer
Zed Bull Key Programmer,Mini Zed Bull Key programmer,Zed-Bull Transponder Cloning car key programmer
DATE: 2014/04/25::
44
Malaysia Air Flight MH370: The Transponder Mystery
Malaysia Air Flight MH370: The Transponder Mystery
DATE: 2014/03/12::
45
Transponder ALT, STBY, IDENT, VFR, FUNC, CLR. Andreas Rosquist
Transponder ALT, STBY, IDENT, VFR, FUNC, CLR. Andreas Rosquist
DATE: 2014/02/21::
46
Ask ATC: Transponder Operations
Ask ATC: Transponder Operations
DATE: 2012/01/06::
47
How To Program a Toyota Scion 4D Dot Transponder Chip Key Programming Scion
How To Program a Toyota Scion 4D Dot Transponder Chip Key Programming Scion
DATE: 2014/09/06::
48
Ilco Transponder Key Detector from clksupplies.com
Ilco Transponder Key Detector from clksupplies.com
DATE: 2013/03/25::
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CHARLOTTE NC: 2000 HONDA ACCORD LOST KEY TRANSPONDER KEY
CHARLOTTE NC: 2000 HONDA ACCORD LOST KEY TRANSPONDER KEY
DATE: 2014/01/08::
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Ha-VIS RFID Transponder
Ha-VIS RFID Transponder
DATE: 2014/03/25::
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From Wikipedia, the free encyclopedia
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A Highway 407 toll transponder

In telecommunication, a transponder is one of two types of devices. In air navigation or radio frequency identification, a flight 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.[1]

Satellite/broadcast communications[edit]

For more details on this topic, see Transponder (satellite communications).

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]

For more details on this topic, see Transponder (aeronautics).
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 'backwards compatible' with Modes A & 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. The 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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