An Ontario Highway 407 toll transponder

In telecommunication, the term transponder (short-for Transmitter-responder and sometimes abbreviated to XPDR, XPNDR or TPDR) has the following meanings: Image File history File linksMetadata No higher resolution available. ... Image File history File linksMetadata No higher resolution available. ... Highway 407, officially called the 407 Express Toll Route (ETR), is a tollway located in southern Ontario Canadas Greater Toronto Area. ... Copy of the original phone of Alexander Graham Bell at the Musée des Arts et Métiers in Paris Telecommunication is the transmission of signals over a distance for the purpose of communication. ...

• An automatic device that receives, amplifies, and retransmits a signal on a different frequency (see also broadcast translator).
• An automatic device that transmits a predetermined message in response to a predefined received signal.
• A receiver-transmitter that will generate a reply signal upon proper electronic interrogation.

Automatic refers to any self-operating machine or automaton. ... An information appliance (IA) is any device that can process information, signals, graphics, animation, video and audio; and can exchange such information with another IA device. ... In radio terminology, a receiver is an electronic circuit that receives a radio signal from an antenna and decodes the signal for use as sound, pictures, navigational-position information, etc. ... Generally, an amplifier is any device that uses a small amount of energy to control a larger amount of energy. ... In telecommunications, transmission is the act of transmitting electrical messages (and the associated phenomena of radiant energy that passes through media). ... In telecommunication, signalling (or signaling) has the following meanings: The use of signals for controlling communications. ... FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. ... In broadcasting, a translator is an FM radio station or a TV station which acts as a full-duplex repeater. ... Message in its most general meaning is an object of communication. ... A response is the following: Often a response is the result of a stimulus. ... A transceiver is a device that has both a transmitter and a receiver which are combined in to one. ... // Electronics is the study of electron mechanics. ... The examples and perspective in this article or section may not represent a worldwide view. ...

Satellite communications

In particular, 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. U.S. military MILSTAR communications satellite A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications. ... Channel, in communications (sometimes called communications channel), refers to the medium used to convey information from a sender (or transmitter) to a receiver. ... A transceiver is a device that has both a transmitter and a receiver which are combined in to one. ... An Icom Radio Repeater. ... Digital video is a type of video recording system that works by using a digital, rather than analog, representation of the video signal. ... In computer science and information theory, data compression or source coding is the process of encoding information using fewer bits (or other information-bearing units) than an unencoded representation would use through use of specific encoding schemes. ... In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ... Video (Latin for I see, first person singular present, indicative of videre, to see) is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion. ... Sound reproduction is the electrical or mechanical re-creation and/or amplification of sound, often as music. ... Wideband is a relative term used to describe a wide range of frequencies in a spectrum. ... A carrier wave, or carrier is a waveform (usually sinusoidal) that is modulated (modified) to represent the information to be transmitted. ... An analog or analogue signal is any continuously variable signal. ... A subcarrier is separate analog or digital signal carried on a main radio transmission, which carries extra information such as voice or data. ... The Atis were just one of the the original inhabitants of the of the Philippines before the arrival of the Malay in the 10th century and the Spanish in the 15th century. ... A radio station is an audio (sound) broadcasting service, traditionally broadcast through the air as radio waves (a form of electromagnetic radiation) from a transmitter to an antenna and a thus to a receiving device. ... Single channel per carrier (SCPC) refers to using a single signal at a given frequency and bandwidth. ... It has been suggested that this article or section be merged with fixed phone. ... An Earth station is the ground based (terrestrial) end of a communications link to an object in space. ...

Aviation

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 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. A Cessna ARC RT-359A Transponder (the beige box) mounted beneath a Bendix/King KY197 VHF communication radio in a light airplane instrument panel A transponder is an electronic device that produces a response when it receives a radio-frequency interrogation. ... In telecommunications, identification, friend or foe (IFF) is a crypto identification system designed for command and control. ... Air Traffic Control Towers (ATCTs) at Amsterdams Schiphol Airport (Netherlands) Air traffic control (ATC) is a service provided by ground-based controllers who direct aircraft on the ground and in the air. ... A Secondary Surveillance Radar (SSR) is a radar device installed in air traffic control facilities to allow the precise identification of aircraft. ... General aviation (abbr. ... Aviation or Air transport refers to the activities surrounding mechanical flight and the aircraft industry. ... This long range Radar antenna, known as ALTAIR, is used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on the Kwajalein atoll[1]. Radar is a system that uses radio waves to determine and map the location, direction, and/or speed... M*A*S*H, see Corporal Walter (Radar) OReilly. ...

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. Another mode called Mode S (Mode Select) is designed to help air traffic control in busy areas and allow automatic collision avoidance. Mode S tranponders 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. Transponder codes are four digit numbers broadcast by the transponder in an aircraft in response to a secondary surveillance radar interrogation signal to assist air traffic controllers in traffic separation. ... General aviation (abbr. ... Balloons are often used or given on special occasions, like cards or flowers. ... Gliders are un-powered heavier-than-air aircraft. ...

Road

The E-ZPass system in the eastern United States is one of many systems for paying bridge and road tolls by a RFID transponder in the car. This article or section does not adequately cite its references or sources. ... An EPC RFID tag used for Wal-Mart Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. ...

Underwater

Sonar transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and navigation. The F70 type frigates (here, La Motte-Picquet) are fitted with VDS (Variable Depth Sonar) type DUBV43 or DUBV43C towed sonars SONAR (SOund NAvigation and Ranging) â€” or sonar â€” is a technique that uses sound propagation under water (primarily) to navigate, communicate or to detect other vessels. ... Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. ...

See also

• Transceiver
• Secondary surveillance radar (Identification friend or foe)
• Transponding with DCC - Transponding in model railroading.
• RFID - low-cost transponder tags for asset tracking and telemetry.

Source: partly from Federal Standard 1037C and from MIL-STD-188 and from the Department of Defense Dictionary of Military and Associated Terms A transceiver is a device that has both a transmitter and a receiver which are combined in to one. ... A Secondary Surveillance Radar (SSR) is a radar device installed in air traffic control facilities to allow the precise identification of aircraft. ... In telecommunications, identification, friend or foe (IFF) is a crypto identification system designed for command and control. ... An EPC RFID tag used for Wal-Mart Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. ... Federal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U.S. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. ... MIL-STD-188 is a series of U.S. military standards relating to telecommunications. ... The Department of Defense Dictionary of Military and Associated Terms is a compedium of terminology used by the United States Department of Defense (DOD). ...