Rohde & Schwarz FSIQ26 20Hz-26GHz Spectrum Analyzer

The Rohde & Schwarz FSIQ26 is a spectrum analyzer spanning 20 Hz to 26.5 GHz, engineered for signal analysis, component testing, and wireless communication standards including W-CDMA. It integrates measurement capabilities across frequency, time, and modulation domains in a single platform, delivering the speed and accuracy required in both development and production environments.

Technical Specifications

Frequency Range: 20 Hz to 26.5 GHz Resolution Bandwidth: 1 Hz to 10 MHz in 1/2/3/5 steps with 5-pole resolution filters. FFT filter option: 1 Hz to 1 kHz for rapid measurements. Noise Floor: Typically -150 dBm in 10 Hz bandwidth; -174 dBm/Hz at 1 Hz resolution bandwidth. Noise figure: 14.7 dB typical at 10 Hz RBW. Dynamic Range & Linearity: Third-order intercept +22 dBm. Intermodulation-free dynamic range exceeds 110 dB. W-CDMA ACPR dynamic range: 75 dB (4.096 MHz integration bandwidth) and 82 dB (alternate channel). 1 dB compression point: +10 dBm. ACPR dynamic range: >80 dB at 1 MHz RBW with +10 dBm input. Phase Noise: -150 dBc/Hz at 5 MHz offset. Amplitude Accuracy: Total level uncertainty <1 dB to 2.2 GHz; <1.5 dB to 7 GHz. True RMS detector for waveform-independent power measurements.

Key Features

• Integrated broadband vector signal analyzer supporting primary mobile radio standards


• Digital and analog modulation support: BPSK to 16QAM, (G)MSK, AM, FM, PM


• Vector signal analysis for W-CDMA/3GPP with symbol rates to 6.4 Msymbol/s


• Modulation quality metrics: EVM, phase error, frequency error, waveform factor, I/Q offset


• Multiple result formats: I/Q signals, magnitude/phase, vector and constellation diagrams, demodulation spreadsheets


• W-CDMA offline demodulation capability


• Fast time domain analysis with 1 µs zero span sweep time


• TDMA burst analysis with gate functions, trigger delay, and integrated RF trigger


• 5 ms full-span sweep time

Typical Applications Component and subsystem testing in 3G and beyond. Signal characterization for wireless transceivers. ACPR and adjacent-channel power measurements. Modulation quality verification.