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Transponder.
Transponder
In telecommunication, the term transponder has the following meanings:
In particular, a communications satellite's channels are called transponders, because each is a separate transceiver or repeater. Older television satellites in the C band have 24 transponders, while newer Ku band ones have 32. With digital video data compression and multiplexing, several video and audio channels may travel through a single transponder on a single wideband carrier. Original analog video only has one channel per transponder, with subcarriers for audio and ATIS. Non-multiplexed radio stations can also travel in single channel per carrier (SCPC) mode, with multiple carriers (analog or digital) per transponder. This allows each station to transmit directly to the satellite, rather than paying for a whole transponder, or using landlines to send it to an earth station for multiplexing with other stations.
Another example of transponders is in identification friend or foe systems and air traffic control secondary radar (beacon radar) systems.
Source: partly from Federal Standard 1037C and from MIL-STD-188 and from the Department of Defense Dictionary of Military and Associated Terms
The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
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