The Keysight N9915C FieldFox is a handheld combination analyzer integrating cable and antenna analysis, spectrum analysis, and vector network analysis into a single portable instrument. Weighing 3.4 kg, it delivers field-grade performance across 3 kHz to 10 GHz with software-defined architecture enabling selective capability upgrades. The unit meets MIL-PRF-28800F Class 2, MIL-STD-810G, and IEC/EN 60529 standards, with water-resistant chassis rated for explosive environments. Its modular design supports optional VNA and spectrum analyzer functions alongside standard CAT capability.
Technical Specifications
Frequency Coverage
• Spectrum Analyzer: 3 kHz to 10 GHz
• Cable/Antenna Analyzer and VNA: 5 kHz to 10 GHz
• Real-time bandwidth: Up to 120 MHz gap-free
• Selectable analysis bandwidth: 10 MHz, 40 MHz, 120 MHz
Network Analysis Performance
• Simultaneous measurement of all four S-parameters
• System dynamic range: >104 dBc to 115 dB
• Mixed-mode S-parameter support
• Time-domain VNA analysis and TDR cable measurements
• Vector voltmeter functionality
Spectrum Analysis Performance
• Frequency accuracy: ±0.15 dB or ±0.3 dB without warmup
• Display average noise level: -160 dBm (3 kHz to 6.5 MHz)
• Third-order intercept: +10 dBm at 1 GHz
• Trace noise: 0.0011 dB at 1 GHz
• Phase noise: -105 dB at 10 kHz offset
Cable and Antenna Analysis
• Return loss, DTF (dB, linear, VSWR), and 1-port cable loss measurements
Signal Generation and Power Measurement
• Built-in pulse signal generator to 54 GHz (Option 357)
• CW signal generation with AM/FM, FSK, and BPSK modulation
• User-defined pulse sequences
• USB power sensor support with frequency-dependent measurements
• Optional built-in power meter and pulse measurement capability
– Key Features
• Software-defined architecture with field-upgradeable licenses
• Water-resistant keypad and case for field deployment
• Single-instrument solution eliminating multiple analyzers
• Over-the-air measurement support
– Typical Applications
RF field testing, antenna characterization, cable integrity verification, network diagnostics, and on-site maintenance across telecommunications, aerospace, and defense environments.
