The Rohde & Schwarz FMAB is a modulation analyzer operating across 50 kHz to 1.36 GHz, engineered for signal characterization in research, development, and production environments. It demodulates and measures AM, FM, PM, pulse, ASK, FSK, and QAM modulation schemes with high precision. The instrument combines RF power measurement, distortion analysis down to 0.005%, and audio-frequency assessment including stereo decoding, making it suitable for comprehensive radio communication device testing.
Technical Specifications
RF Input & Power
• Frequency range: 50 kHz to 1.36 GHz
• Input impedance: 50 Ω (N connector)
• VSWR: <1.4 (with 10 dB attenuation)
• Overload protection: Up to 5 W (15 V RMS); maximum peak voltage 25 V (including DC)
• Power measurement range: −37.5 dBm to +30 dBm
• Power measurement error: ≤1 dB typical (typ. 0.5 dB)
AM Measurement
• Modulation frequency range: 10 Hz to 200 kHz
• Resolution: Better than 0.1% of reading (minimum 0.1 Hz)
• Measurement error: ≤1% (modulation frequencies up to 20 kHz); 0.1% of reading; maximum 0.001% AM with peak detection
FM Measurement
• Modulation frequency range: 10 Hz to 200 kHz
• Frequency deviation measurement error: ≤0.5 Hz (100 MHz), ≤0.7 Hz (170 MHz), ≤2 Hz (340 MHz), ≤3 Hz (680 MHz), ≤3 Hz (1360 MHz), ≤4 Hz (1360 MHz)
PM Measurement
• Modulation frequency range: 10 Hz to 200 kHz
Audio Analysis
• AF frequency measurement: 5-digit readout
• AF voltage measurement: AC/DC capable
• Audio generator: Single and dual tone, stereo MPX
• Distortion measurement: Optional, down to 0.005% in range 10 Hz to 100 kHz
• SINAD measurement: Signal-to-noise and distortion ratio
• Filters: High-pass (10/20/300 Hz); low-pass (3/23/100 kHz); ITU-R (468-4, weighted and unweighted); ITU-T and special weighting filters
– Key Features
• Built-in FM stereo decoder with wide dynamic range and flat amplitude/phase response
• AM/FM/PM demodulation
• RF power, SNR, distortion, and crosstalk measurements
• Modulation analysis across seven digital and analog schemes
– Typical Applications
Radio communication device characterization, modulation quality verification, audio signal integrity testing, broadcast signal analysis.
– Compatibility & Integration
Optional calibration and reference support available via FMA-B4 (AM/FM Calibrator/AF Generator) and FMA-B10 (10 MHz Reference Oscillator).
