The EADS/Racal/Dana 9009 Modulation Meter is a precision instrument for measuring AM and FM modulation characteristics across a wide frequency range. It combines automatic and manual tuning modes to support laboratory and field analysis of RF signal modulation quality, deviation, and depth. The meter delivers accurate modulation measurements with selectable ranges and multiple output formats for system integration and monitoring.
## Technical Specifications
**Frequency Coverage:**
• Automatic tuning: 30 MHz to 1500 MHz
• Manual tuning with external oscillator: 6 MHz to 1 GHz
**FM Deviation Measurement:**
• Ranges: 1.5, 3, 5, 10, 15, 30, 50, 100 kHz peak deviation full scale
• Modulation frequency: 50 Hz to 30 kHz
• Accuracy: ±2% of full scale, ±1% of reading at 1 kHz
• FM rejection (AM error): Less than 2% with peak deviations up to 100 kHz
• Additional deviation error: Less than 250 Hz with AM depth to 80% (300 Hz to 3 kHz modulation)
**AM Depth Measurement:**
• Ranges: 5, 10, 15, 30, 50, 100% full scale modulation depth
• Modulation frequency: 50 Hz to 30 kHz
• Accuracy: ±2% of full scale, ±1% of reading at 1 kHz
• Residual AM: Less than 1% modulation
**Input Characteristics:**
• Low level: 10–100 mV to 500 MHz; 20–150 mV above 500 MHz
• High level: 100 mV–1 V r.m.s. to 500 MHz; 150 mV–1 V r.m.s. from 500 MHz to 1 GHz
• Input impedance: 50 Ω nominal
**Output Specifications:**
• IF output: 500 kHz nominal at 100 mV r.m.s. e.m.f. (600 Ω impedance)
• AF output: 1 V r.m.s. e.m.f. nominal at meter full scale deflection (600 Ω impedance)
• DC output: 1 V e.m.f. nominal at full scale deflection (10 kΩ impedance)
**Power & Environmental:**
• Supply: 115 V or 230 V ±10%, 45–440 Hz
• Power consumption: Approximately 15 VA
• Optional battery pack: ~6 hours continuous operation (10 rechargeable Ni-Cd cells)
• Operating temperature: 0°C to +55°C (0°C to +40°C with battery pack)
## Key Features
• Dual-mode tuning (automatic and manual) for flexible measurement workflows
• Positive and negative FM deviation detection
• Peak, trough, and mean AM depth measurement modes
• Multiple selectable full-scale ranges for FM and AM
• Three independent output formats for external monitoring and data logging
• Portable battery operation option for field deployment
## Typical Applications
• FM and AM transmitter modulation verification
• RF signal characterization during equipment calibration
• Modulation quality assessment in communications systems
• Field service and maintenance of RF equipment
• Laboratory analysis of modulation performance across 6 MHz to 1 GHz band
## Compatibility & Integration
The 9009 delivers IF, AF, and DC outputs (all at 50 Ω/600 Ω impedance) for direct integration with external monitoring systems, chart recorders, or automated test equipment. Low- and high-level input options accommodate a range of RF signal sources without additional conditioning.
