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The green IDENT button is marked "ID". A transponder (short for trans mitter-res ponder [ 1 ] and sometimes abbreviated to XPDR, [ 2 ] XPNDR, [ 3 ] TPDR [ 4 ] or TP [ 5 ] ) is an electronic device that produces a response when it receives a radio-frequency interrogation.
The transponder has a small required set of controls and is simple to operate. It has a method to enter the four-digit transponder code, also known as a beacon code or squawk code, and a control to transmit an ident, which is done at the controller's request (see SPI pulse below). Transponders typically have 4 operating modes: Off, Standby, On ...
When the transponder receives an interrogation request, it broadcasts the configured transponder code (or "squawk code"). This is referred to as "Mode 3A" or more commonly, Mode A. A separate type of response called "Ident" can be initiated from the airplane by pressing a button on the transponder control panel.
An IFF test set used by a United States Air Force avionics technician technical sergeant for testing transponders on aircraft in 2001. Model XAE IFF kit, the first radio recognition IFF system in the U.S. Identification, friend or foe (IFF) is a combat identification system designed for command and control.
The following list shows specific aeronautical transponder codes, and ranges of codes, that have been used for specific purposes in various countries. Traditionally, each country has allocated transponder codes by their own scheme with little commonality across borders. The list is retained for historic interest.
Combined interrogator & transponder system: BAE Systems: AN/APX-118: Identification Friend or Foe (IFF) system: P-3 Orion: AN/APX-119: Identification Friend or Foe (IFF) system: F-15 Eagle, F-15E Strike Eagle: Raytheon: AN/APX-125: Combined interrogator & transponder system: BAE Systems: AN/APX-126: Combined interrogator & transponder system ...
Exercise may positively influence the interactions between brain cells in the hippocampus, a brain region involved in learning and memory, a study in rats suggests, shedding light on why physical ...
Transponders are used on some military aircraft to ensure ground personnel can verify the functionality of a missile’s flight termination system prior to launch. Such radar-enhancing transponders are needed as the enclosed weapon bays on modern aircraft interfere with prelaunch, flight termination system verification performed by range safety ...