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
'der Sender' and 'der Transponder' can both be technical devices that send signals. The important difference is: a transmitter sends out a signal, often without first having to receive a signal itself. A transponder, on the other hand, reacts to a received signal and automatically sends a response back. The words can be confused because both have to do with radio communication and signals. For a general device that transmits, 'Sender' fits better. When it is about automatic identification or response signals, for example in aviation or shipping, 'Transponder' is more precise.
Vor dem Start prüft der Pilot den Transponder im Flugzeug.
Before takeoff, the pilot checks the transponder in the aircraft.
Der Sender auf dem Dach überträgt das Signal bis ins nächste Dorf.
The transmitter on the roof sends the signal as far as the next village.