| Definition: | combination of a radio transmitter and a radio receiver, that transmits a signal automatically in response to an appropriate interrogation signal
Note 1 to entry: The signal transmitted in response is in part predetermined and is generally different from the interrogation signal.
Note 2 to entry: In French, the term “répondeur” has a different meaning in telephony (see IEV 722-05-02) and in underwater acoustics (see IEV 801-32-36).
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