The Keysight N9918B FieldFox is a handheld microwave analyzer delivering lab-grade RF and microwave measurements to 26.5 GHz in a portable, ruggedized platform. This dual-port, modular unit combines cable and antenna analysis with optional vector network analysis, spectrum analysis, real-time spectrum capture, and over-the-air measurements in a single instrument. Field technicians deploy it for wireless system installation, maintenance, and troubleshooting without sacrificing measurement accuracy or dynamic range.
Technical Specifications
Core Specifications
• Frequency Range: 30 kHz to 26.5 GHz
• System Impedance: 50 Ohms; 75 Ohms with adapter and calibration kit
• Ports: 2 built-in
• Display: 6.5″ transflective color LCD with LED backlight
• Weight: 3.4 kg (7.4 lb)
• Operating Temperature: −10 to +55 °C
Optional Measurement Modules
Vector Network Analyzer: 115 dB dynamic range; S-parameter measurement (S11, S12, S21, S22); mixed-mode capability; IF bandwidth 3 Hz to 100 kHz; configurable 101 to 10,001 data points or arbitrary count via front panel and SCPI.
Spectrum Analyzer: ±0.3 dB accuracy without warmup; resolution bandwidth 1 Hz to 5 MHz; DANL −136 to −165 dBm; third-order intercept 15 dBm; includes power meter and noise figure measurement; extended range transmission analysis.
Real-Time Spectrum Analysis: 120 MHz gap-free, real-time bandwidth.
Over-the-Air Measurements: 5G NR and LTE support.
– Key Features
• Cable and antenna analysis with DTF/TDR, return loss, VSWR, and insertion loss
• Calibration support: Unknown Thru, QSOLT, TRL
• Vector voltmeter functionality
• Modular architecture—upgrade from base CAT model to VNA, SA, RTSA, or OTA as needed
• Six-and-a-half inch color display for field readability
– Typical Applications
Wireless communication system installation and maintenance; radar and microwave system characterization; antenna and cable validation; transmission line analysis; signal identification and characterization.
– Compatibility & Integration
SCPI command control; front-panel data point configuration; operates on 50 Ohm systems with 75 Ohm adapter support.
