Rohde & Schwarz FSU26 20Hz – 26.5GHz Spectrum Analyzer

The Rohde & Schwarz FSU26 is a spectrum analyzer designed for RF analysis across aerospace, defense, and telecommunications. Operating from 20 Hz to 26.5 GHz, it delivers exceptional dynamic range and sensitivity required for development, quality assurance, and production environments. The FSU26 combines wide frequency coverage with unprecedented measurement speed and selectivity, establishing a new reference standard for demanding spectrum analysis tasks.

Technical Specifications

• Frequency range: 20 Hz to 26.5 GHz (DC coupled)


• AC coupled operation: 10 MHz to 26.5 GHz


• External mixer extension: Up to 110 GHz and above with R&S FSU-B21 option Dynamic Range and Sensitivity


• Displayed Average Noise Level (DANL): -158 dBm at 1 Hz bandwidth


• DANL with preamplifier: Typically -162 dBm (3.6–8 GHz); -165 dBm (8–13 GHz); -162 dBm (13–18 GHz); -157 dBm (18–22 GHz)


• Third Order Intercept (TOI): >20 dBm, typically +25 dBm


• 1 dB Compression Point: Typically +13 dBm at 0 dB RF attenuation


• RMS detector dynamic range: 100 dB


• Harmonic Suppression (HSOI): Typically 55 dBm Resolution Bandwidth


• Digital filters: 10 Hz to 100 kHz (1, 2, 3, 5 steps)


• Analog filters: 300 kHz to 10 MHz (1, 2, 3, 5 steps)


• FFT filters: 1 Hz to 30 kHz


• 39 channel filters: 100 Hz to 5 MHz


• EMI filters: 200 Hz, 9 kHz, 120 kHz, 1 MHz


• RRC filters available for NADC, TETRA, 3GPP Measurement Performance


• Adjacent Channel Leakage Ratio (ACLR): Typically 77 dB; typically 84 dB with noise correction


• Minimum sweep time (frequency domain): 2.5 ms


• Minimum sweep time (time domain): 1 µs


• Zero span sweep: 1 µs to 16,000 s


• Measurement points per trace: 155 to 10,001 selectable

Key Features

• Highly selective digital filters with fast FFT capabilities


• Versatile resolution filter characteristics across wide bandwidth range


• Rapid acquisition and analysis for time-critical measurements

Typical Applications

• Aerospace and defense RF signal analysis


• Telecommunications development and compliance testing


• Production quality management and acceptance testing


• Wideband signal characterization and monitoring