The Marconi IFR Aeroflex I-1402 is a Mode 4 Accessory Unit that extends the testing capabilities of the ATC-1400A Transponder/DME Test Set to include comprehensive Mode 4 IFF system evaluation. This unit generates and analyzes Mode 4 signals for military Identification Friend or Foe systems, enabling engineers to perform in-depth transponder testing without requiring classified hardware or encryption keys. The I-1402 simulates KIT/KIR TSEC-1A/1C cryptographic computers using NATO-assigned test codes while supporting direct interfacing with actual cryptographic hardware for live system performance validation.
Technical Specifications
Mode 4 Signal Generation and Testing
• Supports Mode 4 A, B, O, and random code generation
• Provides normal, ident, and emergency reply simulations
• Interrogator test capability for Modes 1, 2, A, C, and Mode 4
• Simulates KIT/KIR TSEC-1A/1C cryptographic computers using NATO assigned A, B, and O Mode 4 test codes
Signal Control and Adjustment
• Vernier level control for ATC-1400A RF output in 0.1 dB steps
• ON-OFF control for reply, disparity, P2, P3, P4, and P5 pulses
• Position control for reply, disparity, P2, P3, and P4 pulses
Electrical Interface
• Connects to ATC-1400A via Aeroflex and AUX buses
• Two 25-way interconnect cables for electrical interface
• Coaxial cable for RF vernier control
• Rear panel BNC interconnects for control and signal monitoring
• IEEE-488 GPIB access through ATC-1400A
• Line power switching for synchronized ATC-1400A operation
Physical and Environmental
• Dimensions: 425 mm W × 467 mm D × 89 mm H (16.8 in. W × 18.4 in. D × 3.5 in. H)
• Weight: 7.94 kg (17.5 lbs)
• EN 61010-1:1993 Class 1 portable equipment compliance
• Designed for pollution degree 2 environments and installation categories 1 or 2 supply
– Key Features
Extends ATC-1400A capabilities to Modes 1, 2, 3/A, C, and 4 testing. Eliminates the need for classified hardware during maintenance procedures while preserving the option for live cryptographic computer integration. Fine-grained pulse control enables precise Mode 4 signal manipulation across all NATO test code variants.
– Typical Applications
Mode 4 transponder validation, IFF system maintenance without classified components, interrogator performance testing, cryptographic computer simulation, and live military avionics system integration testing.
– Compatibility & Integration
Primary interface is the ATC-1400A Transponder/DME Test Set. Includes searchable PDF Operation Manual, RF coaxial interface cable, and line cord. Supports GPIB automation via host test set.
