Transponder

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Transponder is a wireless communications, monitoring, or control device that picks up and automatically responds to an incoming signal. The term is a contraction of the words transmitter and responder. Transponders can be either passive or active. This device is primarily used as a re-transmitter due to the fact that it receives a particular signal from a particular source, then it amplifies (strengthens) the signal before sending it to a predefined location.

Also See:

Reference

  1. Wikipedia See Transponder [1]

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