Rohde & Schwarz FSIQ3 20Hz – 8GHz Spectrum Analyzer

The Rohde & Schwarz FSIQ3 is a signal analyzer combining spectrum analysis, vector signal analysis, and time-domain measurement in a single instrument. Designed for 3G mobile radio development and production, it delivers high measurement speed alongside versatile test routines for signal characterization across frequency, time, and modulation domains. The integrated broadband vector signal analyzer supports all major mobile radio standards with symbol rates up to 6.4 Msymbol/s, enabling detailed analysis of I/Q signals, magnitude and phase, vector and constellation diagrams, and modulation error evaluation via spreadsheet output.

Technical Specifications

Frequency Range: 20 Hz to 3.5 GHz Resolution Bandwidth: 1 Hz to 10 MHz in 1/2/3/5 steps; 5-pole resolution filters with FFT filter option (1 Hz to 1 kHz RBW) Noise Floor: −150 dBm typ. (10 Hz BW), −174 dBm/Hz (1 Hz BW) Dynamic Range: Intermodulation-free dynamic range >110 dB; ACPR (WCDMA, 4.096 MHz integration BW) 75 dB; alternate channel ACPR 82 dB Phase Noise: −150 dBc(1/Hz) at 5 MHz offset Level Uncertainty: <1 dB to 2.2 GHz; <1.5 dB to 7 GHz Third-Order Intercept: +20 dBm (with R&S FSIQ3/7) 1 dB Compression Point: +10 dBm Noise Figure: 15 dB typ. Sweep Time: 5 ms full span; 1 µs zero span; 100 ns/div time domain

Key Features

• RMS detector for waveform-independent power measurements


• Digital demodulators: BPSK, QPSK, (G)MSK, 16QAM


• Adjustable cosine and root-cosine filters (0.01 step width)


• Gate functions, trigger delay, and integrated RF trigger for timing analysis


• Fast spectrum analysis at 5 ms sweep time

Typical Applications

• 3G mobile radio system development and validation


• Production test and characterization


• Modulation quality assessment


• Adjacent channel power ratio measurement


• Time-domain signal characterization

Compatibility & Integration Optional Ethernet (B16) and 2nd IEC/IEEE bus interfaces (B17) available. Dimensions: 435 × 236 × 460 mm; weight 24 kg.