Agilent/Keysight N9928A

The Keysight N9928A FieldFox is a handheld microwave analyzer that combines vector network analysis, cable and antenna characterization, power measurement, and spectrum analysis into a single portable instrument. Operating from 30 kHz to 26.5 GHz, it delivers bench-level measurement accuracy in demanding field environments without sacrificing portability or ruggedness.

Technical Specifications

Frequency Range and Resolution

• Operating range: 30 kHz to 26.5 GHz


• Frequency resolution: 1.34 Hz (≤10 GHz), 5.36 Hz (≤20 GHz), 8.04 Hz (≤50 GHz)


• Frequency accuracy: ±0.7 ppm (spec) + aging; typical ±0.4 ppm + aging Vector Network Analysis


• Base configuration: Transmission/Reflection (S11, S21)


• Optional 2-port full S-parameters (S11, S21, S12, S22) and mixed-mode S-parameters


• Dynamic range: Up to 100 dB to 9 GHz, 94 dB to 20 GHz, up to 95 dB with four independent receivers


• Directivity: >42 dB


• Calibration: QuickCal, full 2-port unknown thru, Thru/Reflect/Line (TRL)


• Time Domain Reflectometry (TDR) via inverse Fourier transform of frequency-domain data Cable and Antenna Analysis


• Frequency range: 30 kHz to 26.5 GHz


• Distance-to-fault (DTF), return loss, cable loss, and optional VSWR/reflection measurements Power Measurement


• Built-in power meter: 100 kHz to 26.5 GHz


• USB power sensor support: 9 kHz to 24 GHz (sensor-dependent)


• Average and pulse power measurement


• Output power: ±1 dB flat across frequency range, 1 dB step adjustment


• Maximum leveled output power: Typically -4 dBm Additional Capabilities


• Vector Voltmeter (VVM): 30 kHz to 26.5 GHz for phase and electrical length comparison


• Interference analyzer with spectrogram, waterfall, trace playback, and recording


• Optional variable DC source


• Built-in GPS receiver Measurement Quality


• Trace noise: 0.004 dB rms


• IF bandwidth: 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz

Key Features

• Two built-in measurement ports with 3.5 mm (m) connectors


• Rechargeable Li-ion battery with included AC/DC adapter


• Weight: 3.0 kg (6.6 lb)


• Rugged, dust-free design with no fans or vents


• LAN connectivity and USB for power sensor support and SCPI control

Typical Applications Field testing and maintenance of microwave systems, antenna characterization, cable and transmission line diagnostics, and interference identification across cellular, wireless, and satellite frequency bands.

Compatibility & Integration Supports external USB power sensors and SCPI command control. LAN connectivity enables remote operation and data logging.