The Rohde & Schwarz FSW85 is a high-performance signal and spectrum analyzer spanning 2 Hz to 85 GHz, with optional extension to 90 GHz. Purpose-built for aerospace, defense, telecommunications, and automotive applications, it delivers exceptional measurement accuracy through low phase noise and sensitivity. The analyzer characterizes wideband components, communication systems, and high-performance radar oscillators while identifying spurious emissions and detecting errors in real time.
Technical Specifications
Frequency Range
• Base: 2 Hz to 85 GHz
• Extended: Up to 90 GHz with R&S®FSW-B90G option
• Configurations: 8 GHz, 13.6 GHz, 26.5 GHz, 43.5 GHz, 50 GHz, 67 GHz, 85 GHz
Analysis Bandwidth
• Standard maximum: Up to 5 GHz
• Extended options: Up to 8.3 GHz
• Real-time analysis bandwidth: Up to 160 MHz, 512 MHz, or 800 MHz
Sensitivity & Dynamic Range
• Display noise floor (DANL): -169 dBm/Hz to -126 dBm/Hz
• DANL at low frequencies (≤40 MHz): -120 dBm (1 Hz) at 2 Hz via direct A/D routing
• Adjacent channel leakage ratio (ACLR): 88 dB
• Dynamic range (WCDMA with noise cancellation): -88 dBc
• Residual FM (1 GHz, 1 kHz RBW, 100 ms sweep): <0.1 Hz nominal
Phase Noise
• Typical: -137 dBc (1 Hz) at 10 kHz offset, 1 GHz carrier
• With R&S®FSW-B4 option: -90 dBc (10 Hz), -112 dBc (100 Hz), -130 dBc (1 kHz), -138 dBc (10 kHz), -140 dBc (100 kHz), -149 dBc (1 MHz)
Measurement Accuracy
• Total uncertainty: <0.4 dB up to 8 GHz; <0.37 dB for ≤8 GHz
• Bandwidth uncertainty: <3% nominal; <2% nominal accuracy
Resolution Bandwidth (RBW)
• Standard: 1 Hz to 10 MHz, 80 MHz
• Extended: 1 Hz to 10 MHz in 1/2/3/5 sequence, 3.9 kHz, 6.25 kHz with R&S®FSW-B8 option
– Key Features
• 5 GHz analysis bandwidth for rapid signal characterization
• Up to 800 MHz real-time analysis bandwidth for transient detection
• Sub-0.1 Hz residual FM performance
• Direct low-frequency A/D routing for improved sensitivity below 40 MHz
– Typical Applications
• Wideband component characterization
• Radar oscillator development and validation
• Communication system signal analysis
• Spurious emission identification and mitigation
– Compatibility & Integration
Works with external digitizers including R&S®RTO2044 oscilloscope (up to 2 GHz bandwidth option). Optional bandwidth extensions via R&S®FSW-B1200, R&S®FSW-B2000, R&S®FSW-B4, and R&S®FSW-B8 modules.
