The Rohde & Schwarz FMAV is a VOR/ILS modulation analyzer engineered for precise testing and calibration of VHF Omnidirectional Range (VOR) and Instrument Landing System (ILS) ground station equipment. Advanced digital signal processing delivers measurement accuracy meeting ILS Category III requirements, ensuring reliable performance of critical air navigation systems. The instrument performs selective modulation depth measurements, DDM analysis, phase measurements, harmonic distortion analysis, and baseband signal characterization across AM, FM, and phase modulation domains.
Technical Specifications
RF Characteristics
• Frequency range: 50 kHz to 1360 MHz
• RF input impedance: 50 Ω (N connector)
• VSWR: <1.4
• Power measurement range: 0.18 µW to 1 W (–37.5 dBm to 0 dBm)
Modulation Analysis
• AM measurement: 10 Hz to 200 kHz modulation frequency; ≤0.4% error; 0.1% resolution
• FM measurement: 10 Hz to 200 kHz modulation frequency; ≤0.4% error
• Phase modulation: 200 Hz to 200 kHz modulation frequency
VOR/ILS Specialized Measurements
• Selective modulation depth: <0.8% error (ILS ≤0.5%)
• DDM measurement: ≤0.0002 DDM (localizer), ≤0.0005 DDM (glide path)
• Phase measurement resolution: 0.001°
• VOR subcarrier deviation measurement
• Selective harmonic and THD measurement to IEC 268-3
• Baseband ILS/VOR measurements via voltmeter input
RF Frequency Measurement
• 10-digit readout; ≤10 Hz error at 100 MHz within calibration interval
AF Measurements
• Audio frequency: 5-digit readout
• DC voltage measurement via AF voltmeter
Internal Modulation Source (optional)
• Error: <0.1%; provides high-precision baseband signals via 2 rear AF outputs
Power Requirements
• 100 V / 120 V / 220 V / 240 V ±10%, 47 Hz to 440 Hz; 170 VA
Physical
• Dimensions: 435 mm × 192 mm
• Storage temperature: –40 °C
– Key Features
• DDM accuracy meeting ILS Category III certification requirements
• Selective distortion measurement on n × 30 Hz components (ILS signal)
• Intermodulation product analysis
• Wide modulation frequency coverage from 10 Hz to 200 kHz
– Typical Applications
• ILS and VOR ground station verification and calibration
• Air traffic control facility testing
• Airport navigation system validation
• Airborne system manufacturer testing
– Compatibility & Integration
• IEEE 488 interface for remote control and data acquisition
