- a radio, radar, or sonar transceiver that automatically transmits a signal upon reception of a designated incoming signal.
Origin of transponder
Examples from the Web for transponder
Contemporary Examples of transponder
The tripwire for an unfolding plot to take control of the flight would be the transponder, operated by a switch beside the pilots.
However, to use the phrase “switched off” in relation to the transponder and the ACARS was in itself prejudicial.
With so much else crumbling, the transponder lies at the heart of this great mystery.
Government officials now admit the data system and transponder quit communicating after the pilots said things were OK.
The moment the transponder turned off means everything to the investigation—and it happened after the pilots said things were OK.The Tripwire on Flight 370
March 17, 2014
- a type of radio or radar transmitter-receiver that transmits signals automatically when it receives predetermined signals
- the receiver and transmitter in a communications or broadcast satellite, relaying received signals back to earth
Word Origin for transponder
1945, from trans(mit) + (res)pond + agent noun suffix -er (1).
- A radio or radar transmitter and receiver that responds to an incoming signal either by broadcasting its own predetermined signal (as in aircraft identification systems) or by relaying the incoming signal at a different frequency (as in satellite communications).