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316:(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
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Transponders are used in races for lap timing. A cable loop is dug into the race circuit near to the start/finish line. Each individual runner or car has an active transponder with a unique ID code. When the individual passes the start/finish line, the lap time and the racing position is shown on the
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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
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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.
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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 signal itself.
484:. 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
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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.
96:; 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.
172:(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
328:. 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
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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.
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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
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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.
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As a result, differences in transponder functionality also might influence the functional description of related optical modules like transceivers and
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communication). As such, transponders can be considered as two transceivers placed back-to-back. This view also seems to be held by, for example,
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signal into a full-duplex optical signal. The difference between the two is that transceivers interface electrically with the host system using a
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The term "transponder" can apply to different items with important functional differences, mentioned across academic and commercial literature:
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function only (not differentiating between serial or parallel electrical interfaces), whereas transponders convert an optical signal at one
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transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and
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in many countries. Some countries have also required, or are moving toward requiring, that all aircraft be equipped with Mode S, even in
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360:
592:"WDM and DWDM Multiplexing Powerpoint presentation, School of Electronic and Communications Engineering, Dublin (Ireland), slide 61"
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personnel during training test launches. The transponders re-radiate the signals allowing for much longer communication distances.
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Transponders are used on some military aircraft to ensure ground personnel can verify the functionality of a missile’s
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488:, which may get an acceptable response from the resident's car. Such units properly installed might involve
196:. A transponder is typically characterized by its data rate and the maximum distance the signal can travel.
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375: (GT), and all passenger ships regardless of size. AIS transmitters/receivers are generally called
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in an aircraft that emits a coded identifying signal in response to an interrogating received signal.
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716:| title=Fundamental Operating Principles | website=www.rfid-handbook.de | access-date=2024-07-26}}
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is a device that, upon receiving a signal, emits a different signal in response. The term is a
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Dobkin, Daniel M. (2005). "A Radio-Oriented
Introduction to Radio Frequency Identification".
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prior to launch. Such radar-enhancing transponders are needed as the enclosed weapon bays on
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Optical Fiber
Telecommunications V: Systems and networks, Academic Press, 2008, page 353-354
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interfere with prelaunch, flight termination system verification performed by
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371:(AIS) to be fitted aboard international voyaging ships with 300 or more
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according to another description, transceivers are limited to providing an
395:(radar beacons) designed to make them stand out on a ship's radar screen.
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Device that emits an identifying signal in response to a received signal
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http://www.rfid-handbook.de/downloads/E2E_chapter03-rfid-handbook.pdf
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Depending on the type of interrogation, the transponder sends back a
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receives signals over a range of uplink frequencies, usually from a
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for audio and automatic transmission identification service (
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channels may travel through a single transponder on a single
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on smaller vessels for additional information. In addition,
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Transponders may also be used by residents to enter their
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International
Convention for the Safety of Life at Sea
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to an optical signal at another wavelength (typically
379:, but they generally transmit autonomously, although
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are both functionally similar devices that convert a
118:are called transponders because each is a separate
203:according to one description, a transponder and
271:A transponder in a private plane squawking 2000
336:, the power requirements during long flights.
8:
441:Passive and active RFID systems are used in
772:Dictionary of Military and Associated Terms
320:with Modes A and C. Mode S is mandatory in
156:only has one channel per transponder, with
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502:Acronyms and abbreviations in avionics
275:Another type of transponder occurs in
218:interface, whereas transponders use a
180:for multiplexing with other stations.
106:Transponder (satellite communications)
661:International Maritime Organization.
7:
688:"HOW DOES TRANSPONDER CAR KEY WORK?"
793:- Transponding in model railroading
777:United States Department of Defense
429:transponders to identify vehicles.
361:International Maritime Organization
690:. 19 February 2015. Archived from
461:race back to the start-finish line
100:Satellite/broadcast communications
25:
648:Curtiss-Wright Desfense Solutions
522:Rebecca/Eureka transponding radar
425:in the eastern United States use
764: This article incorporates
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730: This article incorporates
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743:General Services Administration
644:"TELEMETRY RE-RADIATION SYSTEM"
391:often have transponders called
369:Automatic Identification System
827:Radio-frequency identification
445:, and off-road events such as
71:radio frequency identification
1:
288:secondary surveillance radar
277:identification friend or foe
542:"Definition of TRANSPONDER"
290:(beacon radar) systems for
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663:"December 2000 amendments"
629:High Frequency Electronics
419:Electronic toll collection
414:Electronic toll collection
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190:fiber-optic communications
170:single channel per carrier
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616:Fujitsu DWDM Primer, 2004
486:gate interrogation signal
341:flight termination system
263:Transponder (aeronautics)
112:communications satellite
94:satellite ground station
86:communications satellite
822:Motorsport terminology
807:Communication circuits
766:public domain material
738:Federal Standard 1037C
732:public domain material
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184:Optical communications
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791:Transponding with DCC
751: (in support of
367:(SOLAS) requires the
326:uncontrolled airspace
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261:Further information:
90:satellite transponder
33:
385:class B transponders
642:Cook, Paul (2008).
569:. Tech Accessories.
507:Transponder car key
322:controlled airspace
318:backward compatible
296:commercial aviation
285:air traffic control
168:can also travel in
164:). Non-multiplexed
409:Other applications
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227:electrical-optical
75:flight transponder
44:telecommunications
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812:Radio electronics
482:gated communities
476:Gated communities
389:navigational aids
281:military aviation
279:(IFF) systems in
176:to send it to an
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421:systems such as
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314:transponder code
292:general aviation
235:ITU standardized
131:data compression
77:is an automated
38:toll transponder
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154:analog video
135:multiplexing
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18:Transponders
753:MIL-STD-188
555:transponder
512:Transceiver
490:beamforming
209:full-duplex
205:transceiver
158:subcarriers
152:. Original
120:transceiver
79:transceiver
56:transmitter
48:transponder
36:Highway 407
801:Categories
602:2011-02-16
528:References
433:Lap timing
403:navigation
251:muxponders
231:wavelength
212:electrical
137:, several
104:See also:
567:"Kunkune"
517:Muxponder
174:landlines
60:responder
832:Wireless
496:See also
467:Car keys
330:balloons
257:Aviation
220:parallel
147:wideband
124:repeater
116:channels
423:E-ZPass
334:gliders
283:and in
243:Fujitsu
150:carrier
126:. With
457:NASCAR
447:Enduro
355:Marine
216:serial
817:Radar
768:from
734:from
698:2 May
670:'1974
668:SOLAS
399:Sonar
393:RACON
194:fiber
143:audio
139:video
84:In a
52:blend
700:2019
449:and
427:RFID
359:The
332:and
294:and
239:DWDM
237:for
162:ATIS
141:and
133:and
88:, a
73:, a
58:and
46:, a
363:'s
298:.
188:In
122:or
114:’s
69:or
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54:of
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110:A
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34:A
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