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Jul 02, 2019  Ahh, Thanks Radar Contact, I believe my shop needs to do some homework. Massive vst plugin full version free download. The transponders audio output could not be connected to my audio panel either. I have a King KMA 20 audio panel. On another topic what audio panels do you folks recommend? The air traffic control radar beacon system (ATCRBS) is a system used in air traffic control (ATC) to enhance surveillance radar monitoring and separation of air traffic. It consists of a rotating ground antenna and transponders in aircraft. The ground antenna sweeps a narrow vertical beam of microwaves around the airspace. When the beam strikes an aircraft, the transponder. A RACON (RAdar and beaCON) is a radar transponder commonly used to mark maritime navigational hazards. When a racon receives a radar pulse, it responds with a signal on the same frequency which puts an image on the radar display.

In telecommunication, a transponder is a device that, upon receiving a signal, emits a different signal in response.^[1] The term is a portmanteau of transmitter and responder.^[2] It is variously abbreviated as XPDR, XPNDR, TPDR or TP.

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. 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.

Satellite/broadcast communications[edit]

A communications satellite’s channels are called transponders because each is a separate transceiver or repeater. With digital videodata compression and multiplexing, several video and audio channels may travel through a single transponder on a single widebandcarrier. 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,^[3] a transponder and transceiver are both functionally similar devices that convert a full-duplexelectrical 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,^[4] 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.^[5]

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

Aviation[edit]

Another type of transponder occurs in identification friend or foe (IFF) systems in military aviation and in air traffic controlsecondary surveillance radar (beacon radar) systems for general aviation and commercial aviation.^[6]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 toward 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.

Transponders are used on some military aircraft to ensure ground personnel can verify the functionality of a missile’s flight termination system prior to launch. Such radar enhancing transponders are needed as the enclosed weapon bays on modern aircraft interfere with prelaunch, flight termination system verification performed by range safety personnel during training test launches. The transponders re-radiates the signals allowing for much longer communication distances.^[7]

Marine[edit]

The International Maritime Organization's International Convention for the Safety of Life at Sea (SOLAS) requires the Automatic Identification System (AIS) to be fitted aboard international voyaging ships with 300 or more gross tonnage (GT), and all passenger ships regardless of size.^[8] 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. A capacitor in the radio receiver of the vehicle generates a voltage in the key's transponder by inductive coupling.^[9][10]

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.

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]

1. ^https://www.merriam-webster.com/dictionary/transponder
2. ^transponder
3. ^Optical Fiber Telecommunications V: Systems and networks, Academic Press, 2008, page 353-354
4. ^WDM and DWDM Multiplexing Powerpoint presentation, School of Electronic and Communications Engineering, Dublin (Ireland), slide 61
5. ^Fujitsu DWDM Primer, 2004
6. ^Dobkin, Daniel M. (2005). 'A Radio-Oriented Introduction to Radio Frequency Identification'. High Frequency Electronics.
7. ^Cook, Paul (2008). 'TELEMETRY RE-RADIATION SYSTEM'. Curtiss-Wright Desfense Solutions.
8. ^International Maritime Organization. 'December 2000 amendments'. SOLAS'1974. Archived from the original on 2014-07-25.
9. ^http://carlocksmith.co/7-how-does-transponder-car-key-work.html
10. ^http://www.rfid-handbook.de/downloads/E2E_chapter03-rfid-handbook.pdf

• This article incorporates public domain material from the General Services Administration document: 'Federal Standard 1037C'. (in support of MIL-STD-188)
• This article incorporates public domain material from the United States Department of Defense document: 'Dictionary of Military and Associated Terms'.

External links[edit]

• Transponding with DCC - Transponding in model railroading

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A search and rescue transponder (SART) is a self-contained, waterproof transponder intended for emergency use at sea. These devices may be either a radar-SART, or a GPS-based AIS-SART (automatic identification system SART).

The radar-SART is used to locate a survival craft or distressed vessel by creating a series of dots on a rescuing ship's radar display. A SART will only respond to a 9 GHz X-band (3 cm wavelength) radar. It will not be seen on S-band (10 cm) or other radar. Shipboard Global Maritime Distress Safety System (GMDSS) include one or more search and rescue locating devices.The radar-SART may be triggered by any X-band radar within a range of approximately 8 nautical miles (15 kilometers). Each radar pulse received causes the SART to transmit a response which is swept repetitively across the complete radar frequency band. When interrogated, it first sweeps rapidly (0.4 microsecond) through the band before beginning a relatively slow sweep (7.5 microseconds) through the band back to the starting frequency. This process is repeated for a total of twelve complete cycles. At some point in each sweep, the radar-SART frequency will match that of the interrogating radar and be within the pass band of the radar receiver. If the radar-SART is within range, the frequency match during each of the 12 slow sweeps will produce a response on the radar display, thus a line of 12 dots equally spaced by about 0.64 nautical mile (1.2 km) will be shown. When the range to the radar-SART is reduced to about 1 nautical mile (2 km), the radar display may show also the 12 responses generated during the fast sweeps. These additional dot responses, which also are equally spaced by 0.64 nautical mile (1.2 km), will be interspersed with the original line of 12 dots. They will appear stronger and larger the closer the interrogating radar gets, slowly becoming arcs at first until the SART is within 1NM, the arcs will become full circles indicating the active SART is in the general area.

SARTs are typically cylindrical, about the size of a person's forearm, and brightly coloured.

See also[edit]

• Civil Air Patrol (US Air Force Auxiliary)
• Emergency position-indicating radio beacon (EPIRB)

Sources[edit]

IMO Sub-Committee on Safety of Navigation, Operation of Marine Radar for SART Detection, SN/Circ. 197

External links[edit]

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• SART Test equipment – Test Box for SART annual survey