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'''Transponders''' are radio beacons which make [[aircraft]] more identifiable on [[ATC]] displays and systems. Modern transponders support transmitting additional data such as an identification ('squawk') code and aircraft altitude. See more at | '''Transponders''' are radio beacons which make [[aircraft]] more identifiable on [[ATC]] displays and systems. Modern transponders support transmitting additional data such as an identification ('squawk') code and aircraft altitude. See more at {{wikipedia|Transponder (aeronautics)}}. | ||
== Id Codes == | == Id Codes == | ||
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== Modes == | == Modes == | ||
{{hatnote|For a thorough description, see {{wikipedia|Aviation transponder interrogation modes}}.}} | |||
Civilian Mode-S and Mode-C both transmit pressure altitude (at 10-foot and 100-foot precision, respectively). To do this the transponder needs an altitude source. In real-life this can be a separate box called an encoder, or may be derived for FMC / ADIRU sources. It's important to note this altitude is referenced to standard pressure (29.92 inHg / 1012Hpa), and not corrected for actual barometric pressure in the local environment. | |||
Additional support for military modes is possible if anyone wishes to add it. | Additional support for military modes is possible if anyone wishes to add it. |