Rohde & Schwarz FSG8 9KHz – 8GHz Spectrum Analyzer

The Rohde & Schwarz FSG8 is a spectrum analyzer covering 9 kHz to 8 GHz, engineered for signal analysis in telecommunications, aerospace, and defense applications. It delivers advanced measurement capabilities including adjacent channel power, total indicated noise, CCDF analysis, and vector signal analysis across multiple wireless standards. The instrument combines exceptional frequency resolution of 0.01 Hz with low phase noise, outstanding sensitivity to –166 dBm (with preamplifier), and 100 dB dynamic range via RMS detection.

Sweep times range from 1 µs to 16000 s, supported by configurable resolution bandwidths from 10 Hz to 10 MHz and FFT filters down to 1 Hz. An internal reference provides ±1.8 × 10⁻⁷ total error per year, with options for external 1 MHz to 20 MHz reference inputs. The analyzer includes 4 Msample I and Q memory, 28 MHz demodulation bandwidth, and a frequency counter with resolution from 0.1 Hz to 10 kHz.

Measurements in the time domain are resolved to 31.25 ns via marker and cursor lines. The consistent user interface integrates efficiently into existing R&S test environments.

Technical Specifications

• Frequency Range: 9 kHz to 8 GHz (DC coupled); 1 MHz to 8 GHz (AC coupled)


• Frequency Resolution: 0.01 Hz


• Reference Frequency Aging: ±1 × 10⁻⁹/day, ±1 × 10⁻⁷/year; temperature drift ±8 × 10⁻⁸; total error ±1.8 × 10⁻⁷/year


• Frequency Counter Resolution: 0.1 Hz to 10 kHz (selectable)


• Sweep Time: 1 µs to 16000 s (time sweep, zero span); 2.5 ms to 16000 s (frequency sweep)


• Resolution Bandwidths: 10 Hz to 10 MHz (1/2/3/5 sequence); FFT filters 1 Hz to 30 kHz


• SSB Phase Noise (640 MHz): –105 dBc (1 kHz and 10 kHz offsets), –120 dBc (100 kHz), –138 dBc (1 MHz), –150 dBc typical (10 MHz)


• Sensitivity (2 GHz): –141 dBm typical without preamplifier; –166 dBm typical with preamplifier


• Dynamic Range: 100 dB (RMS detector); ACLR up to 77 dB


• Demodulation Bandwidth: 28 MHz


• Memory: 4 Msample I and Q


• Time Domain Resolution: 31.25 ns

Key Features

• Selectable AC and DC coupling for extended low-frequency coverage


• External reference input (1 MHz to 20 MHz) for frequency synchronization


• Digital and analog filter options with shape factors <3% (digital) and <10% (analog)


• 1 dB compression point reference baseline for dynamic performance


• Residual FM specification <1 Hz (nominal, 10 kHz RBW)

Typical Applications

• Product development and validation in wireless communications


• Adjacent channel power and in-band noise characterization


• Vector signal analysis across 3GPP and proprietary standards


• RF compliance and interference testing in aerospace and defense


• Time-domain transient measurements via marker-based analysis

Compatibility & Integration The FSG8 shares a consistent operating paradigm with the broader R&S spectrum analyzer family, enabling straightforward integration into multi-instrument test racks and reducing operator training overhead.