The Rohde & Schwarz FSH4 is a handheld spectrum analyzer engineered for field installation, maintenance, and troubleshooting of RF and electronic systems. It delivers comprehensive measurement capabilities across 9 kHz to 3.6 GHz (models .04/.14) or 100 kHz to 3.6 GHz (models .24/.28) with displayed average noise level down to -161 dBm/Hz with preamplifier. The instrument combines spectrum analysis, vector network analysis, power measurements, and modulation-specific analysis in a portable platform designed for demanding field environments.
Technical Specifications
Frequency Range: 9 kHz to 3.6 GHz (.04/.14 models); 100 kHz to 3.6 GHz (.24/.28 models)
Resolution Bandwidth: 1 Hz to 3 MHz
Sensitivity: < -141 dBm (1 Hz); < -161 dBm (1 Hz) with preamplifier
Displayed Average Noise Level (DANL): -141 dBm/Hz typical (without preamplifier, RBW = 1 Hz normalized); ≤ -161 dBm/Hz with preamplifier; -163 dBm/Hz at 1 GHz typical
Phase Noise: < -105 dBc (1 Hz) at 100 kHz offset (f=500 MHz); < -127 dBc (1 Hz) at 1 MHz offset (f=500 MHz)
Third Order Intercept (TOI): +7 dBm typical (+11 dBm) for fin < 300 MHz; +15 dBm typical (300 MHz to 3.6 GHz)
Amplitude Accuracy: < 0.5 dB
Measurement Uncertainty: 54 dBc (intermodulation-free)
Demodulation Bandwidth: 20 MHz for LTE analysis
Reference Oscillator Aging: 1 × 10⁻⁶ per year; Temperature drift: 1 × 10⁻⁶ (0–30 °C), 3 × 10⁻⁶ (+30–50 °C)
– Key Features
• Spectrum analysis with scalar and vector network analysis options
• RF channel power, ACLR, TDMA, and code domain power measurements
• Distance-to-fault and cable loss analysis
• Field strength and EMI precompliance testing
• Interference detection and signal monitoring
• Predefined settings for WCDMA, CDMA2000®, 1xEVDO, TD-SCDMA, and LTE
• AM modulation depth and pulse analysis (with options)
• External power sensors support up to 110 GHz or 18 GHz depending on sensor type
• Directional power measurements up to 4 GHz
– Typical Applications
• Transmitter system commissioning and maintenance
• Cable and antenna verification
• Interference hunting and signal characterization
• Channel scanning and signal monitoring
• EMI/EMC field surveys
