Rohde & Schwarz FSW85 Spectrum Analyzer

2 Hz - 85 GHz

The Rohde & Schwarz FSW85 Spectrum Analyzer covers a frequency range of 2 Hz to 85 GHz with options for enhanced performance. With the B3 low phase noise option, it achieves phase noise of −137 dBc/Hz at a 10 kHz offset. The B5000 and B512 options enable analysis bandwidths up to 5 GHz, while the B21 preamplifier improves sensitivity and the B4 low noise path further reduces noise levels. The B71 option provides external IF input and output for flexible wideband analysis, making the instrument suited for satellite RF testing and advanced vector signal analysis.

Product Info Related Products

Frequency Range	2 Hz – 85 GHz (with integrated harmonic mixers)
Analysis Bandwidth	Up to 5 GHz (with Opt. B5000)
Internal Analysis Bandwidths	10 MHz (base) 5 GHz (Opt. B5000)
Dynamic Range	TOI: +25 dBm (typical) W-CDMA ACLR: –75 dBc Phase noise: –137 dBc/Hz (10 kHz offset, 1 GHz carrier)
Displayed Average Noise Level (DANL)	–174 dBm/Hz (preamp off) –152 dBm/Hz (preamp on, with B21)
Options Installed	B3 – Low phase noise B4 – Low noise path B21 – Preamplifier (2 Hz – 30 GHz) B71 – External IF input/output B512 – 512 MHz analysis bandwidth B5000 – 5 GHz analysis bandwidth
External IF I/O (B71)	70 MHz IF output, external IF input for wideband analysis
Phase Noise (with B3)	–137 dBc/Hz @ 10 kHz offset, 1 GHz carrier
Input Attenuator Range	0 – 75 dB, 5 dB steps
Reference Frequency	10 MHz, aging ≤ 5 × 10⁻⁸/year
Level Measurement Uncertainty	±0.3 dB (typical, 2 GHz, 20 °C – 30 °C)
Interfaces	LAN, GPIB, USB, DisplayPort