The Marconi IFR Aeroflex 1200 Communication Service Monitor is a microprocessor-controlled, portable instrument engineered for evaluation and maintenance of AM, FM, and SSB communication systems. This fully integrated service monitor combines RF signal generation, reception, spectrum analysis, and oscilloscope functions into a single benchtop and field-deployable unit. The digitally synthesized architecture eliminates auxiliary equipment requirements, enabling technicians to execute complex radio diagnostics and performance verification with minimal setup overhead.
Technical Specifications
RF Signal Generator
• Frequency range: 250 kHz to 999.9999 MHz
• Resolution: 100 Hz
• Output level (T/R port): −127 dBm to −20 dBm; simplex mode: −130 dBm to −20 dBm; duplex mode: −130 dBm to −40 dBm
• AUX output: −130 dBm to +13 dBm
• Output resolution: 10 dB steps with 11 dB vernier
• Accuracy: ±2.5 dB (±3.0 dB at −20 dB attenuator setting)
• Internal frequency modulation: 0 to 50 kHz (1 kHz tone); FM deviation 0 to 20 kHz; AM modulation 0 to 60%
• Spectral purity: −30 dBc (harmonics), −55 dBc (non-harmonics)
Duplex Generator
• Frequency offset range: 0 to ±49.9975 MHz from receive frequency
• Resolution: 2.5 kHz
• Supports separate transmit/receive ports, common T/R port, and off-the-air testing modes
Receiver
• Frequency range: 250 kHz to 999.9999 MHz (1200A: 250 kHz to 1 GHz)
• Triple conversion architecture
• Sensitivity: 2 µV (AM, FM, SSB)
• Input protection: 0.25 W antenna; 150 W receiver
Spectrum Analyzer
• Frequency range: 250 kHz to 1 GHz
• Dynamic range: 70 dB (−30 dBm to −100 dBm)
• Optional tracking generator for cable testing
Oscilloscope
• Bandwidth: DC to 1 MHz (3 dB)
• Input ranges: 10 mV/div to 10 V/div
– Key Features
• Vacuum Fluorescent Display with microprocessor control
• Voice modulation via front panel microphone input
• Internal audio function generator and external modulation sources
• Compact portable design for field service applications
– Typical Applications
• Radio system commissioning and acceptance testing
• Field maintenance and troubleshooting of communication networks
• Duplex system verification using separate or common ports
• Off-the-air performance monitoring and signal analysis
– Compatibility & Integration
Model variants include 1200S, FM/AM-1200S, and FM/AM-1200A configurations supporting extended frequency coverage to 1 GHz on select models.
