Aircraft have transponders to assist in identifying them on air traffic control radar. The green IDENT button is marked "ID".Ī transponder (short for transmitter-res ponder and sometimes abbreviated to XPDR, XPNDR, TPDR or TP ) is an electronic device that produces a response when it receives a radio-frequency interrogation. In this example, the transponder code selected is 1200 for VFR flight (in North American airspace). Cessna ARC RT-359A transponder (beige box), beneath a VHF radio.
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