AN/APX-121(V) Mode S Mark XII IFF Transponder
The AN/APX-121(V) includes advanced microwave and digital design features that fully support organic maintenance concepts. The transponder design incorporates all Mode S and Mode 5 requirements. Design features include Mode S Elementary (ELS) and Enhanced (EHS) operation, support of existing KIT-1 INFOSEC, and a removable INFOSEC appliqué supporting Mode 5 growth. The AN/APX-121(V) is the ideal solution for replacing existing transponders to meet Mode S and Mode 5 mandates.
The Northrop Grumman AN/APX-121(V)/RT-1909 Mode S Transponder is designed to meet the latest AIMS (DOD AIMS 03-1000, 04-900) and STANAG 4193 specifications.
The AN/APX-121(V) utilizes advanced RF and digital processing to increase reliability, maintainability, and to permit product upgrades and future growth.
Features of the AN/APX-121(V) include the ability to operate with existing KIT-1 Computers and Mode 5 operation with the addition of an NSA-certified INFOSEC appliqué. The AN/APX-121(V) offers interface flexibility through either an optional 1553B MUX BUS or a C-12718/APX Remote Control Unit (RCU), for Mode S control.
The features of the AN/APX-121(V) include:
- Advanced design for all airborne and shipboard applications
- Mode S Level 3 Enhanced Surveillance (EHS) with growth to Level 4 and ADS-B
- INFOSEC appliqué eliminates external KIT-1 Computer
- 1553B or RCU interface
- Capable of growth to Mode 5 (all levels)
- Supports TCAS via ARINC-429 or 1553B
- >4,000 hours mean time between failure
- 99% internal fault detection
- Designed to replace older IFF transponders including the AN/APX-100, AN/APX-101, AN/APX-108, and others.