The Keysight N9934C FieldFox is a handheld signal analyzer delivering spectrum analysis, power measurement, and field testing capabilities across 3 kHz to 6.5 GHz. Built for field engineers and technicians, it combines four-trace spectrum analysis with precision power metering and real-time signal monitoring in a portable 3.4 kg package. The N9934C excels at characterizing RF devices, validating antenna performance, and troubleshooting signal integrity in applications where bench equipment cannot reach.
Technical Specifications
Frequency Coverage: 3 kHz to 6.5 GHz
Amplitude Accuracy: ±0.20 dB overall
Noise Performance: -164 dBm DANL at 1 GHz; -124 dBc/Hz phase noise at 1 MHz offset; -112 dBc/Hz at 10 kHz offset; -113 dBc/Hz at 30 kHz offset
Dynamic Range: >104 dBc system dynamic range; +10 dBm TOI at 1 GHz
Analysis Bandwidth: 10 MHz standard; optional 40 MHz or 120 MHz; real-time spectrum analysis to 120 MHz gap-free; IQ streaming to 1 MHz
RF Connectivity: Two Type-N (f) test ports; one internal source; optional 3.5 mm connectors available
Attenuator: 0 to 40 dB range in 5 dB steps
Environmental: -10 to 55°C operating temperature; 3.4 kg weight
– Key Features
• Four-trace spectrum analysis with selectable detector types and radio standard masks
• Channel power, occupied bandwidth, adjacent channel power, and spectrum emission mask measurements
• AM/FM tune and listen capability with frequency counter marker
• Field strength measurements supporting antenna factors
• Built-in power meter with external RF and microwave power sensor support
• InstAlign technology for immediate power measurement accuracy without warm-up cycles
• PowerSuite channelized measurements for communication systems analysis
• Rechargeable Li-ion battery with AC/DC adapter
– Typical Applications
• Cable and connector characterization in field environments
• Antenna performance validation and diagnostics.
• Spectrum occupancy surveys and interference identification
• Transmitter power and modulation quality assessment
• Signal integrity verification across RF networks
– Compatibility & Integration
Supports external RF and microwave power sensors for extended measurement range. Handheld form factor with soft carrying case, backpack straps, and quick reference guide included.
