Rohde & Schwarz FSEK20 20Hz to 40GHz Spectrum Analyzer

The Rohde & Schwarz FSEK20 is a spectrum analyzer covering 20 Hz to 40 GHz, engineered for demanding signal analysis across general-purpose measurements and advanced digital communication systems. The instrument delivers 152 dB maximum dynamic range with 109 dB dynamic range at 1 MHz resolution bandwidth, enabling detailed analysis of complex signals including power ramps and modulated waveforms. Its modular architecture supports optional extensions and future upgrades, while native demodulation (AM/FM) and optional digital signal analysis capabilities provide flexibility for diverse measurement requirements.

Technical Specifications

• Frequency Range: 20 Hz to 40 GHz (extensible via FSE-B2 option for 7 GHz extension)


• Dynamic Range: 152 dB maximum; 109 dB at 1 MHz RBW with +10 dBm compression point


• Resolution Bandwidth: 1 Hz minimum, configurable in 1/2/3/5 steps


• Video Bandwidth: 1 Hz to 10 MHz in 1/2/3/5 steps


• Sweep Time: 1 µs to 1500 s


• Detection: RMS


• 1 dB Compression Point: +10 dBm typical (+13 dBm in some configurations)


• Third Order Intercept (TOI): +25 dBm typical


• Display: 24 cm (9.5 inch) active color TFT


• Markers: Eight simultaneous markers


• Time Base: OCXO with 1×10⁻⁹ aging per day (FSE-B4 option)

Key Features

• Signal analysis bandwidth: 28 MHz standard, 120 MHz optional


• I/Q memory: 16 Msample standard, expandable to 705 Msample


• Multiple filter characteristics: channel, Gaussian, FFT, RRC, and EMI filters


• Demodulation: AM and FM built-in


• AM/FM and optional vector signal analyzer (FSE-B7 option)

Measurement Capabilities

• Spectrum analysis, intermodulation, harmonics, and spurious measurements


• Phase noise and burst analysis


• Power ramping and gated measurements


• Vector, frequency, and phase error analysis


• Eye and constellation diagrams


• CCDF amplitude statistics


• Modulation depth and deviation


• Optional noise measurement software (FS-K3)

Compatibility & Integration

• LAN and USB interfaces


• External mixing option (FSE-B21)


• Broadband output at 741.4 MHz (FSE-B23 option)