Keysight FieldFox D – Analysis and capture of wideband signals anywhere you need

New generation of FieldFox handheld analyzers delivers all-in-one capability for spectrum monitoring, signal analysis and generation, interference hunting, and cable and antenna testing in both field and lab environments.

Key capabilities of the N99xxD-Series FieldFox
handheld analyzer include: 

• 120-MHz IQ streaming with built-in SFP+ high-speed data interfaces for 10 GbE data transfer, ensuring uninterrupted data capture and efficient streaming
• Wideband signal analysis and playback for advanced troubleshooting in complex RF environments, spectrum utilization monitoring, and interference detection
• Seamless field-to-lab workflow, enabling re-creation of real-world signal scenarios for in-depth lab analysis and system optimization
• Unmatched RF performance, delivering absolute amplitude accuracy of ±0.1 dB —without warm-up — surpassing most handheld and benchtop analyzers currently in the market

Today’s radio frequency (RF) environments are becoming increasingly complex and dynamic, as mission-critical, commercial, and consumer systems converge across the spectrum. From 5G and radar to emerging 6G and satellite communications, engineers face mounting challenges in identifying interference, capturing transient events, and characterizing wideband signals without data loss. Traditional handheld analyzers often fall short — limited by bandwidth, streaming speed, or data-transfer bottlenecks.

The new FieldFox D-Series bridges this gap by combining the ruggedness of a field instrument with the power and precision of a lab analyzer. It empowers users to capture, stream, and replay every signal event, enabling faster troubleshooting, deeper analysis, and greater confidence that no data is missed, even in the most complex RF landscapes.

The N99xxD-Series includes 14 models (combo or spectrum analyzers) to cover the maximum frequency of 14, 18, 26.5, 32, 44, 50, and 54 GHz. Each model supports more than 25 software-defined FieldFox applications, including vector network analysis, spectrum and real-time spectrum analysis, noise figure measurement, electromagnetic interference analysis, pulse signal generation, and direction-finding using techniques like angle of arrival (AoA) and time difference of arrival (TDoA). A Linux-based operating system further enhances the analyzer’s security and file management, while a touchscreen interface improves usability, efficiency, and reduces errors.

Keysight has introduced advanced artificial intelligence (AI) capabilities to its FieldFox handheld analyzers and Keysight Spectrum Management Software (KSMS S9910A), delivering faster and smarter spectrum operations. By leveraging wideband signal capture and the new machine learning model (S9916A), the solution now classifies major wireless standards — including LTE, 5G NR, Wi-Fi, and Bluetooth — with exceptional speed and accuracy. This integration automatically and dramatically reduces time-to-resolution and provides deep insights into congested or contested spectrum environments, empowering customers to make informed decisions in real time.

Product page of Keysight FieldFox D analyzers HERE.