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Fire Control (Breakaway)
Transponder Set Functional Description

Aviation Electronics Technician 1 (Organizational)
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Figure 3-16.-SA-176/A RF transmission line switch. processes valid IFF interrogations and provides coded pulse train replies to give automatic radar identification of the aircraft in one of five modes. The five modes are discussed later in this chapter. The transponder set also provides the Selective Identification Feature (SIF) to permit a specific aircraft to be selected from other properly responding aircraft. Major Components The transponder set consists of four main boxes and a test set. These components will be discussed in the following text. RF TRANSMISSION LINE SWITCH SA-1769/A.— The RF transmission switch (fig. 3-16) alternately connects the transponder set to the top or bottom UHF L-band antenna. This switching (lobing) Figure 3-17.-C-6280(P)/APX transponder control box. operates at 38 Hz. The lobing action prevents the antenna system from being blanked out during aircraft maneuvers. TRANSPONDER SET CONTROL C-6280(P)/ APX.— The IFF control box (fig. 3-17) provides the IFF transponder operational and test controls. The IFF transponder control box controls the transponder in any of the five modes: modes 1, 2, 3A, C, and 4. RECEIVER-TRANSMITTER RT-859/ APX-72.— The receiver-transmitter (fig. 3-18) will Figure 3-18.-RT-859/APX-72 receiver-transmitter. 3-16







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