Agilent/Keysight N9912C

The Keysight N9912C FieldFox is a software-defined handheld RF analyzer purpose-built for field deployment across demanding test environments. This configurable platform operates as a cable and antenna analyzer (CAT), vector network analyzer (VNA), or spectrum analyzer (SA), with optional real-time spectrum analysis (RTSA) and over-the-air measurement capabilities for 5G NR and LTE systems. The instrument combines dual built-in ports with up to 115 dB VNA dynamic range and spectrum analyzer accuracy of ±0.15 dB, delivering measurement performance in a portable 3.34 kg package.

Type-tested to MIL-STD-810G Method 511.5 Procedure I for explosive environments and rated IP53 per IEC/EN 60529, it operates reliably from -10 to +55 °C across harsh field conditions.

Technical Specifications

• Frequency range: 3 kHz to 10 GHz (4, 6.5, and 10 GHz configurations available)


• Analysis bandwidth: Up to 40 MHz


• Real-time bandwidth: Up to 40 MHz gap-free


• IF bandwidth options: 3 Hz to 100 kHz (3 Hz, 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz) Electrical Performance


• VNA dynamic range: Up to 115 dB (100–110 dB typical)


• Spectrum analyzer accuracy (without warmup): ±0.15 dB, ±0.3 dB


• System dynamic range: >104 dBc


• SA DANL: -160 dBm (3 kHz to 30 MHz region)


• Dual built-in ports Physical & Environmental


• Weight: 3.34–3.4 kg


• Display: 6.5-inch transflective color LCD-LED with LED backlight


• Operating temperature: -10 to +55 °C


• Environmental rating: IP53 (IEC/EN 60529), MIL-PRF-28800F Class 2

Key Features

• Vector voltmeter and built-in power meter


• Independent signal generator with tracking generator option


• Real-time and interference analysis modes


• Time domain reflectometry (TDR) for cable characterization


• Pulse measurement and analog demodulation


• Phase array antenna support


• GPS/GNSS receiver for geolocation and timestamping


• Indoor and outdoor mapping functions


• EMI and EMF measurement capabilities


• USB power sensor compatibility


• Pre-amplifier and channel scanner options


• Selectable 10 MHz or 40 MHz bandwidth configurations

Typical Applications

• Field installation and maintenance of RF networks


• Cable and antenna acceptance testing


• 5G NR and LTE over-the-air measurements


• Spectrum monitoring and interference detection


• Network analyzer measurements in remote locations


• Explosive environment operations

Compatibility & Integration The N9912C accepts external USB power sensors and supports GPS/GNSS integration for time-synchronized, geotagged measurements across distributed test sites.