The Marconi IFR Aeroflex 2947 Communications Service Monitor is a multifunction test instrument that combines signal generation, spectrum analysis, digital storage oscilloscopy, and power measurement into a single militarized unit. Designed for field and laboratory deployment in demanding environments, it supports analysis of radio communication systems across military and aviation sectors, including US Navy and FAA applications. The 2947 and 2947A variants deliver precise RF measurements and modulation analysis with real-time capability across a 50 dB to 70 dB dynamic range.
Technical Specifications
Frequency Coverage: 400 kHz to 1 GHz (signal generator extends to 1.05 GHz)
RF Power Measurement:
• Up to 150 Watts RF power measurement capability
• Low-level signal detection from 2 µV
• 5 Watt protection on all RF ports
Signal Generator:
• +5 dBm output (+7 dBm overrange)
• ±2 dB level accuracy above -127 dBm
• Fast switching speed across 400 kHz to 1.05 GHz
Spectrum Analyzer:
• 50 dB dynamic range (2947); 70 dB dynamic range (2947A)
• 100 Hz per division to full span resolution
• Tracking generator with offset tracking and automatic harmonic analysis
Oscilloscope (DSO):
• 50 kHz digital storage oscilloscope with anti-aliasing
• Audio signal and transient waveform analysis
Modulation Analysis (2947A):
• AM, FM, PM, CW, FSK, PSK demodulation modes
• SSB demodulator (upper and lower sideband) across 400 kHz to 1 GHz
Audio: Two variable audio generators
Storage: PCMCIA 2 memory card slot (DOS formatted)
Interface: RS-232 control
Power: AC/DC operation
– Key Features
• Militarized construction per MIL-T-28800 Type II, Class 3 (2947); MIL-PRF-28800F, Class 2 (2947A)
• Weight under 15 kg (2947A) / under 12 kg (2947)
• Compact bail arm design with front panel protective cover
• Color-coded keyboard and superfast LCD display with rapid refresh
– Typical Applications
• AMPS and TACS cellular testing
• PMR and EDACS radio/repeater test operations (2947A)
• Full duplex radio and repeater path verification
• Receiver and transmitter bit error rate testing (2947A)
– Compatibility & Integration
RS-232 control interface for system integration and automated test sequences. PCMCIA memory card support enables field data logging and program storage.
