Rohde & Schwarz FSL18 9KHz – 18GHz Spectrum Analyzer

The Rohde & Schwarz FSL18 is a portable spectrum analyzer spanning 9 kHz to 18 GHz (overrange to 20 GHz) designed for development, service, and production environments. Weighing less than 8 kg with integrated carrying handle and optional battery operation, it delivers high-end measurement capability in a field-deployable package. The instrument combines 28 MHz demodulation bandwidth with resolution from 10 Hz to 10 MHz, achieving displayed average noise levels of -162 dBm (1 Hz FFT RBW, preamplifier at 500 MHz).

Phase noise performance reaches -103 dBc (1 Hz) at 10 kHz offset, with third-order intercept at +18 dBm. Level measurement uncertainty remains below 0.5 dB across 30 kHz to 3 GHz, scaling to 1.2 dB at 6–18 GHz.

Technical Specifications

• Frequency Range: 9 kHz to 18 GHz (overrange to 20 GHz)


• Demodulation Bandwidth: 28 MHz


• Resolution Bandwidth: 10 Hz to 10 MHz


• Displayed Average Noise Level: -162 dBm (1 Hz FFT RBW, preamplifier, 500 MHz); -158 dBm typical at 3 GHz


• Phase Noise: -103 dBc (1 Hz) at 10 kHz offset


• Third-Order Intercept: +18 dBm


• Amplitude Range: DANL to +20 dBm


• Level Measurement Uncertainty: <0.5 dB (30 kHz–3 GHz); <0.8 dB (3–6 GHz); <1.2 dB (6–18 GHz)


• Detectors: Positive/negative peak, auto peak, RMS, quasi-peak, average, sample


• RF Attenuator: 5 dB steps


• Reference Frequency: OCXO standard

Key Features

• Tracking generator available to 18 GHz on selected models


• Direct compatibility with R&S NRP-xx power sensor series; R&S FSL-K9 option for precision power measurement


• Plug-and-play upgrade capability - all options installable without opening the instrument


• Software suite conforming to high-end spectrum analyzer architecture


• Remote control interface enabling transfer of existing measurement code

Typical Applications

• Radar system and microwave link characterization


• Production testing of microwave components


• Spectral and modulation parameter measurement on WLAN and WiMAX signals


• Field service and mobile deployments

Compatibility & Integration Software and remote control protocols align with Rohde & Schwarz high-end spectrum analyzer standards, supporting straightforward migration of measurement routines across product lines.