The IFR Aeroflex COM-120C is a portable communications service monitor that combines RF signal generation, receiver measurement, audio analysis, and spectrum monitoring into a single instrument. Operating across 250 kHz to 1 GHz, it delivers dual RF generator and receiver functions in duplex mode with frequency offsets to ±999.7500 MHz. The unit supports AM, FM, and phase modulation with modulation analysis, SINAD measurement, distortion analysis, and frequency error detection. RF power measurement spans 2 mW to 200 W, while the integrated spectrum analyzer provides full 250 kHz to 1 GHz coverage with variable scan widths from 1 kHz to 100 MHz per division. A 50 kHz digitized oscilloscope and dual audio generators (10 Hz to 20 kHz and fixed 1 kHz) support comprehensive audio characterization. The color display ensures readability in field and bench environments.
Technical Specifications
RF Signal Generation & Reception
• Frequency range: 250 kHz to 1000 MHz
• Generator output: -130 dBm to -13 dBm
• Modulation: AM, FM, PM (Phase Modulation)
• Tone generation: DTMF, user-defined tone codes, digital codes
• Duplex offset: ±999.7500 MHz
• Demodulation: AM, FM, PM modulated signals
Measurement Functions
• RF power: 2 mW to 200 W
• AM modulation analysis
• FM deviation measurement
• Phase modulation measurement
• Distortion, frequency error, received level
• SINAD and AF frequency analysis
• Antenna protection: 10 W maximum with overload alarm
Audio & Analysis Tools
• Generator 1: 10 Hz to 20 kHz (sine, square, triangle, ramp)
• Generator 2: 1 kHz fixed tone
• Oscilloscope: 50 kHz digitized, single trace
• Spectrum analyzer: 250 kHz to 1000 MHz with 1 kHz to 100 MHz scan width range
• Frequency sweep via predefined frequency list
Interfaces & Power
• RS-232 control interface standard
• IEEE-488 (GPIB) optional
• AC power: Maximum 265 VAC input
• DC power option available (Option 01)
– Key Features
• Integrated tracking generator
• Split-screen digitized spectrum analysis to 1 GHz
• Duplex RF generator and receiver operation
• Color display for field and bench use
• Portable design for mobile deployment
– Typical Applications
• Two-way radio system commissioning and maintenance
• Transmitter and receiver performance verification
• Modulation quality and distortion analysis
• RF power measurement and alignment
• Frequency sweep testing and characterization
– Compatibility & Integration
RS-232 interface enables local control and remote integration into test systems. Optional IEEE-488 (GPIB) connectivity supports automated multi-instrument configurations.
