The Marconi IFR Aeroflex NAV-402AP2 is a ramp and bench test set engineered for functional verification and calibration of aircraft navigation and communication avionics. This self-contained unit delivers modulated signal generation across ILS, VOR, Marker Beacon, Localizer, Glide Slope, and VHF Communication bands, supporting CAT I, CAT II, and CAT III ILS testing requirements in field and maintenance environments.
Technical Specifications
System Support
• Marker Beacon (MKR), VOR, Localizer (LOC), Glide Slope (G/S), and VHF COMM avionics testing
• CAT I, CAT II, and CAT III ILS functional requirements
Frequency & Phasing
• VOR, LOC, and MKR: phase-locked at 25 kHz intervals
• G/S band: phase-locked at 50 kHz intervals
• VHF COMM: 25 kHz phase-locking intervals (NAV-402AP2 variant)
• Crystal (XTAL) and Variable (VAR) frequency modes supported
Signal Generation
• 3600 digitally derived VOR courses selectable in 0.1° increments with accuracy better than ±0.1°
• Dual independent internal localizer transmitters for simultaneous LOC and G/S radiation in G/S FIXED mode
• Modulation tones: 1020, 400, 1300, 3000 Hz (±1% accuracy)
• NAV tones: digitally derived from 2.16 MHz crystal oscillator
• LOC/G/S tone phasing: 90 Hz and 150 Hz phase-locked at 0.1° accuracy with 5° step variation
• MKR modulation: 95% (±5%); LOC/VOR/COMM modulation: 30% (±2%)
• Output attenuation: −7 dBm to −110 dBm range; maximum output −7 dBm (0.1 V)
Measurement
• RF frequency counter across all bands
• VHF COMM transmit frequency measurement
– Key Features
• Front-panel LOC and G/S centering calibration
• Sweep LOC DDM capability for autopilot capture testing
• 90-degree VOR output bearing monitor with TO-FROM switch
• Two independent localizer transmitters for simultaneous signal radiation
– Typical Applications
Ramp and bench maintenance testing; avionics system verification; ILS receiver certification; navigation system performance validation.
– Compatibility & Integration
Designed for field technician and engineering deployment across diverse operational environments. Self-contained operation eliminates external signal source dependencies.
