The term transponder is often interchanged with multiplex ... There is also the possibility the signal strength and quality of one multiplex could be different from another.

Aviation transponders identify the location of aircraft and provide other flight information via a radio-frequency signal. These devices, also known as beacons, allow aircraft location to be plotted ...

The statement from Assad's ally is the first on his whereabouts since rebels took control of Damascus.

Radio-frequency transponders are important equipment in the commercial air traffic control (ATC) system. A transponder on a commercial aircraft permits ground-based ATC personnel to monitor the ...

Using equations dating from 3rd century China as well as cutting edge weak signal telemetry, Apollo engineers devised a complex but workable system that used an S-Band transponder to take data ...

Passive Integrated Transponder (PIT) tags help scientists ... To activate the tag, a low-frequency radio signal is emitted by a scanning device that generates a close-range electromagnetic field.