Aeroflex IFR Marconi NAV-750B – Signal Generator

The Aeroflex IFR Marconi NAV-750B is a self-contained bench signal generator engineered for semi-automatic functional testing and calibration of airborne navigation and communication receivers. It simulates VOR, ILS (localizer and glide slope), COMM, and marker beacon signals with precision accuracy, eliminating the need for multiple test instruments. The unit generates authentic modulation patterns and supports both manual and automatic frequency selection with variable rate control.

Technical Specifications

• VOR: 108 MHz to 117.95 MHz


• ILS (localizer/glide slope): 329.15 MHz to 335 MHz


• COMM: 118.000 MHz to 156.000 MHz in 25 kHz steps


• Marker Beacon: 70.000 MHz to 79.000 MHz


• General RF: 100 kHz to 1.9 GHz Output Power


• VOR: 0.1 μV to 1000 μV


• ILS: 0.1 μV to 300 μV Modulation Capabilities


• VOR: 30 Hz, 9960 Hz, or combined 30 Hz + 9960 Hz


• ILS: 400 Hz, 1300 Hz, 3000 Hz, 9960 Hz


• COMM: 1020 Hz tone (0–60% modulation depth)


• Precision 90 Hz and 150 Hz generators for on-course and off-course LOC/G/S simulation Frequency Accuracy & Control


• Crystal controlled, phase-locked in 25 kHz steps


• Accuracy: ±10 ppm


• Variable frequency control: ±30 kHz (marker beacon), ±50 kHz (VOR/LOC/COMM), ±150 kHz (glide slope)


• Auto-increment rates: 25, 50, 100, or 200 kHz VOR Bearing Control


• Twelve preset bearings at 30° intervals with ±10° adjustment


• Continuous bearing adjustment: 0.01° or 0.05° increments


• Bearing accuracy: ±0.05°


• Built-in bearing monitor displays to 0.01° resolution ILS Centering


• Accuracy: ±0.001 DDM Physical & Environmental


• Dimensions: 9.2" × 5.4" × 2.5" (23.4 cm × 13.7 cm × 6.4 cm)


• Weight: 3.5 lbs (1.6 kg)


• Operating temperature: −10°C to 55°C


• Power: AC/DC adapter, 4 AA batteries, or external DC 11 V to 32 V

Key Features

• LCD backlit display for real-time signal parameters


• Automatic frequency selection by thumbwheel or variable-rate auto-channeling


• ARINC Two-Out-of-Five wire frequency selection output


• Manual and external channeling inputs


• RS-232, USB, and optional GPIB interfaces

Typical Applications

• VOR/ILS receiver certification and maintenance


• COMM transceiver functional testing


• Marker beacon system validation


• Avionics bench calibration

Compatibility & Integration MIL-PRF-28800F Class 3 compliant and CE certified. Interfaces include RS-232, USB, optional GPIB, and ARINC Two-Out-of-Five wire output for direct integration with automated test systems and navigation equipment.