transponder


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transponder

[tranz′pän·dər]
(communications)
A transmitter-receiver capable of accepting the challenge of an interrogator and automatically transmitting an appropriate reply.
A receiver-transmitter, such as on satellites, which receives a transmission and retransmits it at another radio frequency.

transponder

A receiver/transmitter that will generate a reply signal upon proper interrogation; the interrogation and reply being on different frequencies (ICAO). The transponder may be ground-based or be in an aircraft. It also could be the airborne radar beacon receiver/transmitter portion of the air traffic control radar beacon system (ATCRBS), which automatically receives radio signals from interrogators on the ground and selectively replies with a specific reply pulse, or pulse group, only to those interrogations received on the mode to which it is set to respond.

transponder

A receiver/transmitter on a communications satellite. It receives a microwave signal from earth (uplink), amplifies it and retransmits it back to earth at a different frequency (downlink). A satellite has several transponders.
References in periodicals archive ?
The goal is one transponder that will work everywhere," said Anne Ford, WSDOT's commercial vehicle services administrator.
Officials said I-PASS transponders might sometimes operate even if not correctly installed, but to ensure the transponder is read accurately it should be properly mounted on a windshield.
He added that repairs were done, but subsequent tests showed a malfunction on the acoustic communication link between the Bluefin-21 and the Ocean Shield's transponder.
THE FAILURE of the GSLV or Geosynchronous Satellite Launch Vehicle, which was to place in orbit the communication satellite GSAT-5P, having 36 transponders, has put the Indian Space Research Organisation (ISRO) in a fix over the availability of satellite transponders for its users.
Sure enough, Williams found that he could tie the transponder onto a beetle "as a necklace," he says.
From May 30 to June 5, the ratio of vehicles with a transponder accounted for 6.
Under terms of the agreement, transponders from all three companies must conform to packaging dimensions and pin functionality, and they must meet or exceed optical electrical characteristics.