transponder
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transponder
An electronic device that receives a signal and automatically sends another signal in response. The term is used in aviation, shipping, or for identification.
Jedes Flugzeug ist mit einem Transponder ausgestattet, der seine Position und Kennung an die Flugsicherung übermittelt.
Every aircraft is equipped with a transponder that transmits its position and identifier to air traffic control.
'Transponder' is a blend of the English terms 'transmitter' and 'responder'. This origin perfectly explains its function: it is a device that responds to a received signal with its own signal.
Der Transponder im Auto ermöglicht die automatische Bezahlung der Maut.
The transponder in the car enables automatic toll payment.
This is a technical term. It is used mainly in fields such as aviation and aerospace, shipping, logistics, and animal identification.
Dank des Transponders konnte die entlaufene Katze schnell gefunden werden.
Thanks to the transponder, the runaway cat was found quickly.
Common verbs are 'einen Transponder aktivieren' (to activate a transponder), 'mit einem Transponder ausstatten' (to equip with a transponder), or 'ein Signal senden/empfangen' (to send/receive a signal). The word is often used in connection with identification and locating.
Der Pilot wurde angewiesen, den Transponder zu aktivieren.
The pilot was instructed to activate the transponder.
station / sender
Sender and Transponder are devices that emit signals. A Sender can send a signal without having received another one first. A Transponder, by contrast, receives a request and automatically sends a response to it; this fixed reaction is why only Transponder fits here.
Der Transponder des Flugzeugs antwortet automatisch auf das Signal der Bodenstation.
The aircraft's transponder automatically responds to the ground station's signal.
Der Sender des Notrufgeräts überträgt regelmäßig seine Position.
The emergency transmitter regularly transmits its position.
