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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.
Code Countries Allocated use 0000 Europe: Non-discrete mode A code; shall not be used. [1]UK: Mode C or other SSR failure [2]: US: Should never be assigned. [3]Military intercept code.
One is that the interrogation pulse is followed by a 12-bit code similar to the ones sent back by the Mark 3 transponders. The encoded number changes day-to-day. When the number is received and decoded in the aircraft transponder, a further cryptographic encoding is applied.
A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...
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 ...
The transponder on any aircraft within range of the interrogation replies on 1090 MHz with their squawk code (known as mode A) and altitude code (or mode C). Mode S transponders also reply on this frequency, and encoded within the mode S transmission is the mode A (squawk) and mode C (altitude) information.
Merchant code range. Business type. 0001–1499. Agricultural services. 1500–2999. Contracted services. 4000–4799. Transportation services. 4800–4999. Utility ...
Depending on the type of interrogation, the transponder sends back a transponder code (or "squawk code", Mode A) or altitude information (Mode C) to help air traffic controllers to identify the aircraft and to maintain separation between planes. Another mode called Mode S (Mode Select) is designed to help avoiding over-interrogation of the ...