The Marconi IFR Aeroflex 2945B is a communications service monitor that combines signal generation, spectrum analysis, power measurement, and audio analysis in a single portable instrument. Weighing under 12 kg, this field-deployable unit serves technicians maintaining cellular, land mobile radio, and avionics systems with integrated test capabilities spanning 400 kHz to 1.05 GHz.
Technical Specifications
Signal Generator
• Frequency range: 400 kHz to 1.05 GHz
• Output level (N-Type socket): −141 dBm to −21 dBm
• Output level (BNC socket): −115 dBm to +5 dBm (overrange to +7 dBm)
• Output level accuracy: ±2 dB above −127 dBm
• Fast switching speed
Spectrum Analyzer
• Frequency range: 100 kHz to 1.05 GHz (manual tune); 10 MHz to 1 GHz (auto-tune)
• Resolution bandwidth: 1 Hz or 10 Hz selectable to 1050 MHz
• Span settings: 1 kHz/div to full span or 100 Hz/div to full span
• Dynamic range: 60 dB below reference level
• Supports transient and harmonic analysis
Power Meter
• Measurement range: 2 µV to 150 W; 5 mW to 150 W (N-Type)
• Accuracy: Better than 10% down to 5 mW (N-Type)
• Standard 5 W RF port protection; 150 W measurement without external attenuators
Oscilloscope & Audio Analysis
• Digital storage oscilloscope with 50 kHz bandwidth and anti-aliasing
• Dual audio generators for internal modulation or transmitter stimulus
• Standard filters: band pass, low pass, high pass, and 1 kHz notch for distortion/SINAD
• AM demodulation: 100 kHz to 1.05 GHz, modulation frequencies 300 Hz to 3.4 kHz
• AM demodulation distortion: Less than 2% CCITT
– Key Features
• Compact, rugged design rated for field and workshop environments
• Full-performance spectrum analyzer with live look-and-listen capability
• Integrated dual-channel audio generation and analysis
• Transient capture and harmonic measurement support
• Adjustable reference level and selectable resolution bandwidth
– Typical Applications
• Cellular and land mobile radio system servicing
• Avionics communication equipment maintenance
• Transmitter and receiver alignment
• Modulation quality and distortion analysis
• RF power and signal integrity verification
– Compatibility & Integration
N-Type and BNC connectors support direct RF measurements across the 400 kHz to 1.05 GHz band. Demodulated audio outputs enable laboratory-grade signal analysis alongside field troubleshooting.
