The Keysight N9912C FieldFox is a software-defined handheld RF analyzer delivering cable and antenna analysis, vector network analysis, and spectrum analysis up to 10 GHz in a single portable instrument. Field-configurable across CAT, VNA, and SA modes, it combines 115 dB dynamic range with ± 0.3 dB spectrum analyzer accuracy and requires no warm-up. The unit operates from 3 kHz minimum start frequency and supports optional 100 MHz analysis bandwidth for 5G NR and LTE over-the-air measurements. Real-time spectrum analysis with 40 MHz gap-free bandwidth delivers 100% probability of intercept on signals as brief as 6.13 µs. Dual Type-N female connectors, built-in DC bias source, GNSS receiver, and Keysight ECal module support enable rapid field calibration and geolocation tagging. Remote operation via iOS/Android or SCPI over LAN/USB simplifies deployment. Integrated measurements span insertion loss, return loss, time-domain reflectometry, all four S-parameters with phase, power meter, phase noise, pulse analysis, EMF/EMI detection, and interference identification. Weighs 3.34 kg with anti-glare 6.5-inch LCD display.
Technical Specifications
• Frequency Range: 3 kHz to 10 GHz (VNA/SA modes)
• S-Parameter Dynamic Range: Up to 115 dB
• Spectrum Analyzer Accuracy: ± 0.3 dB (no warm-up required)
• Phase Noise @ 1 GHz (30 kHz offset): -114 dBc/Hz
• Real-Time Bandwidth: 40 MHz gap-free (optional 100 MHz analysis bandwidth)
• RTSA Signal Capture: Minimum 6.13 µs duration with 100% probability of intercept
• Tracking Generator: Full-band output to 10 GHz
– Key Features
• Simultaneous measurement of S11, S21, S12, S22 with magnitude and phase
• Time-domain reflectometry and distance-to-fault analysis
• Mixed-mode S-parameter support with VNA CalReady for field deployment
• Built-in variable voltage DC bias source
• GNSS receiver with geolocation and event timestamping
• Keysight USB ECal module compatibility
• Reference/trigger I/O (SMB male out, SMA female in, 50 Ω)
– Measurement Functions
• Cable and antenna analysis: insertion loss, return loss, cable loss, TDR
• Vector network analysis: S-parameters, magnitude, phase, time domain
• Spectrum analysis with optional real-time bandwidth
• 5G NR and LTE over-the-air measurements
• Power meter, USB power, vector voltmeter, interference analyzer, phase noise, pulse, analog demodulation, frequency counter, EMF/EMI
– Connectivity & Integration
• Type-N (female) connectors
• SCPI control over LAN and USB
• Remote operation via iOS and Android apps
• GNSS-enabled timestamping and geolocation
