AN/UPX-28(V)2 Transponder Set
The Transponder Set AN/UPX-28 is an AIMS Mk XII IFF system that receives interrogation signals from air, surface and land IFF-equipped units and automatically replies with a coded response signal that provides ownship identification. The AN/UPX-28 receives, decodes and responds to the characteristic interrogations of operational modes 1, 2, 3A, C and 4. Special coded identification of position and emergency signals may be transmitted to interrogating stations when conditions warrant. The range of the AN/UPX-28 is limited to line-of-sight transmission since its frequency of operation is in the UHF band. The AN/UPX-28 integrates most below-deck transponder components into a single unit, which includes controls and indicators to permit control and monitoring of the transponder operations.
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