The Keysight N9923A FieldFox is a portable, battery-operated RF vector network analyzer that delivers benchtop VNA capabilities in a handheld form factor. Operating from 2 MHz to 4 GHz or 6 GHz, it integrates a full two-port VNA, Cable and Antenna Tester, Distance-to-Fault tester, power meter, and one- or two-channel vector voltmeter in a single instrument. Field engineers can measure S-parameters, return loss, VSWR, insertion loss, cable loss, and electrical length without returning to the lab.
Technical Specifications
Frequency & Dynamic Range
• Frequency range: 2 MHz to 4 GHz (N9923A-104) or 2 MHz to 6 GHz (N9923A-106)
• Dynamic range: Up to 90 dB for S-parameters
• Output power: Up to +5 dBm
• Frequency reference accuracy: ±2 ppm with ±1 ppm/yr aging rate and ±1 ppm temperature stability over -10 °C to operating range
Calibration
• QuickCal technology for temperature drift correction without external calibration kit
• Full 2-port calibration, Unknown Thru, and TRL calibration methods
• User-defined custom mechanical calibration kits supported
• 10-minute warm-up period required for warranted performance
– Key Features
S-Parameter & Network Measurements
• S11 and S21 (magnitude and phase) standard
• S22 and S12 (magnitude and phase) with Option 122
• All four S-parameters measured simultaneously with single connection
• Transmission/reflection, return loss, VSWR, and insertion loss measurements
• Cable loss (1-port) and Distance-to-Fault testing
Additional Capabilities
• 1- and 2-channel vector voltmeter (Option 308) for phase shift and electrical length measurement
• Built-in power meter with USB power sensor support for average and pulse power measurements
• Time-domain analysis with gating for selective response removal (Option 010)
• Mixed-mode S-parameters (Option 212)
– Typical Applications
Field verification of RF components, antenna tuning, transmission line characterization, cable integrity assessment, and impedance matching validation in outdoor and remote installations.
– Compatibility & Integration
Supports USB power sensors. Operates within stable temperature environments for optimal accuracy. Designed for demanding field conditions while maintaining laboratory-grade measurement performance.
