Transpondedor/Repetidor de impulsos

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(tran spon’ d∂r) A device which transmits a signal upon receiving another signal. When the receiver in the device detects the ‘‘interrogating signal’’ it triggers the transmitter which replies with a coded pulse or sequence of pulses or responds in some other way. Transponders are used with both electromagnetic and sonar waves. A radar transponder is also called a radar beacon, a sonar transponder a pinger.