Agilent/Keysight N9915C

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

• 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.