Electronic Manufacturing & Repair

For more than 30 years, AAMSI has developed, manufactured and repaired Mark XII Diversity systems for the Original Equipment Manufacturers, US Government and approved foreign militaries. AAMSI has full evaluation and repair capability for the KY-532, APX-64, APX-72, APX-76, APX-77, APX-100, APX-101, APX-109, APX110, and APX-121. AAMSI also manufactures the APX-72, APX-77, APX-109, and APX-101. In 2010, AAMSI introduced the AN/APX-121 MK XII IFF Diversity Transponder next-generation, solid state, IFF technology to the market.

Electronics & Systems
  • IFF Systems
  • Amplifiers
  • Antennas
  • Cable Assys
  • Circuit Card Assys
  • Data Terminals
  • Panels
  • Passive Components
  • Receivers
  • Transceivers
  • Transmitters
Component Capabilities
  • Altimeters
  • Cable Assemblies
  • Communication Devices
  • Control Boxes
  • IFF Transponders
  • Indicators
  • Navigational Components
  • Power Supplies
  • Printed Circuit Boards
  • Receiver Transmitters
  • Switches
  • Test Equipment
  • Build to Print Electronics Components

Electronic Manufacturing

The AN/APX-121 transponder represents the first application of our vast experience with legacy systems and all the lessons learned to a new product design. This design, combined with the latest technology and manufacturing techniques assures a product that will not only perform to all specified and tested requirements, but will be supportable throughout its life cycle. The AN/APX-121 is one of the highest reliability transponders on the market today with a mean time between failures (MTBF) of 4,400 hours under the extremes of aircraft operating conditions.

AAMSI’s AN/APX-121 transponder is a solid-state, digital design that supports Modes 1, 2, 3/A, C and 4. Additionally, it will support Mode S (ELS). The APX-121 integrates with the 1553B MUX BUS, TCAS via ARINC-429, NSA INFOSEC Applique, KIT-1 INFOSEC, and C-12718/APX RCU. The AN/APX-121 Mode 4 / Mark XIIA Transponder is an improved version of the AN/APX-108. It was specifically designed to incorporate the latest military mandates including Mode S and Mode 4. This modern design eliminates any concern of design or parts obsolescence and provides all new features.

The AN/APX-121 offers clear advantages over other transponders. These advantages include a design architecture that minimizes the number of modules, permits organic maintenance down to the piece-part level for all modules, includes a crypto appliqué for easier maintenance handling, incorporates true digital processing of received and transmitted signals, uses a FLASH memory device to store platform configuration information as well as time-tagged fault data.


Electronics and Avionics Repair

AAMSI has extensive experience and past performance in the repair and manufacture of legacy Mark XII 1FF transponders under license with the equipment’s design authority. Our past performance includes U.S. Government and Commercial end users, with AAMSI serving as a prime and subcontractor in fulfillment of these contracts. AAMSI’s role as a subcontractor has been in support of Northrop Grumman, as well as several PROS IV and FMS prime contractors. All contracts were delivered complete on or ahead of contractual delivery dates and there have been no product quality deficiency reports.

AAMSI is licensed by Lockheed Martin and Northrop Grumman Corporation to design, manufacture and/or repair state-of-the-art and legacy electronic systems, including, IFF systems. We are proud to provide cables, boards, boxes, electronics design, manufacturing and repair of aerospace components and systems.

Avionics & Electronics Repair


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