The Keysight N9933B FieldFox is a handheld RF vector network analyzer combining VNA, cable and antenna analyzer, and spectrum analyzer capabilities in a single ruggedized unit. Operating from 9 kHz to 4 GHz, it delivers field-grade measurements without requiring external calibration kits or warm-up periods. The instrument features 100 dB dynamic range for 2-port transmission, real-time spectrum analysis with 120 MHz bandwidth, and built-in CalReady technology for rapid field calibration with temperature drift compensation.
Technical Specifications
Frequency Range & Performance
• Operating range: 9 kHz to 4 GHz (usable down to 5 kHz)
• VNA starting frequency: 30 kHz
• Output power (typical): Up to 9 dBm
Spectrum Analyzer
• Amplitude uncertainty: ±0.3 dB (no warm-up required)
• Real-time bandwidth: Up to 120 MHz
• Minimum signal duration: 5.52 µs at 100% probability of intercept
• DANL @ 1 GHz: −163 dBm
• Phase noise @ 1 GHz (1 MHz offset): −124 dBc/Hz
• Phase noise @ 1 GHz (10 kHz offset): −117 dBc/Hz
• Phase noise @ 1 GHz (30 kHz offset): −115 dBc/Hz
• Third order intercept @ 1 GHz: +11 dBm
• Attenuator range: 40 dB (5 dB steps)
Vector Network Analyzer
• Full 2-port S-parameters (magnitude and phase)
• Dynamic range: 100 dB for 2-port transmission
• Calibration: TRL, LRL, and offset short options
• Time domain analysis with gating
• Field calibration via QuickCal and built-in standards
Cable and Antenna Analysis
• Direct cable loss measurement
• Distance-to-fault (DTF) capability
• Return loss and VSWR measurements (Option 320)
– Key Features
• Dust-free sealed design with no vents or conventional fans
• Ruggedized and weather-resistant construction (MIL-PRF-28800F Class)
• I/Q data capture for RF signal monitoring
• Optional pre-amplifier, tracking generator, and power sensor support
• Pulse measurement capability (Option 330) for radar characterization
• Built-in GNSS receiver with geolocation and timestamping (Option 307)
• Extended range transmission analysis (ERTA)
• 5G NR and LTE over-the-air measurement support
– Typical Applications
• Field testing and maintenance of RF and microwave systems
• Cable and transmission line fault location
• Device characterization under field conditions
• Radar pulse profile analysis
• Cellular network validation and troubleshooting
