Keysight Technologies has released the N99xxD-Series FieldFox Handheld Analyzer. This is the newest addition to the well-known FieldFox lineup. The D-Series is built for accuracy, durability and portability. It offers 120 MHz gap-free IQ streaming and high-speed data transfer. This design ensures smooth workflows from field to lab. It sets a new standard for wideband signal analysis in critical RF environments.
RF landscapes are getting crowded and complex. Engineers in commercial, defense, satellite, and 6G sectors now face more challenges. Tasks such as interference hunting, capturing transient events, and characterizing wideband signals need equipment that offers full bandwidth and steady data flow. Traditional handheld analyzers often fall short in these areas.
The FieldFox D-Series tackles these challenges. It combines the rugged reliability of a field tool with the precise accuracy of lab-grade analyzers. Users can easily capture, stream, and replay real-time RF activity. This way, no signal event gets missed, even in busy spectrum environments.
Key Features of the N99xxD-Series FieldFox Handheld Analyzer
120 MHz gap-free IQ streaming uses integrated SFP+ interfaces. This enables 10 GbE data transfer for ongoing data capture and smooth streaming.
Wideband signal analysis and playback is great for:
Interference hunting
Spectrum monitoring
Diagnosing complex RF issues
Field-to-lab integration replicates real-world signals in controlled settings. This process improves system validation and optimization.
Excellent RF performance offers ±0.1 dB absolute amplitude accuracy right away. This beats many handheld and benchtop analyzers.
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The N99xxD-Series has 14 models. They come as combination or spectrum analyzers. Their frequency range is from 14 to 54 GHz. Each unit supports over 25 software-defined FieldFox applications, including vector network analysis, real-time spectrum analysis, noise figure measurements, EMI diagnostics, pulse signal generation, and direction-finding techniques like angle of arrival (AoA) and time difference of arrival (TDoA). A secure Linux-based OS boosts system protection and file management. A simple touchscreen interface makes operations faster and reduces user errors.
Keysight has added advanced AI features to its FieldFox family and KSMS S9910A. This expands its spectrum intelligence portfolio. The system now uses wideband signal capture and the S9916A machine-learning model. It automatically finds key wireless standards like LTE, 5G NR, Wi-Fi, and Bluetooth. It does this with great accuracy. This AI-powered workflow cuts down resolution time. It also gives users better insights into crowded or contested RF environments.
Eric Taylor, General Manager and Vice President of Keysight Aerospace, Defense, and Government Solutions, stated: “Keysight is dedicated to providing robust, efficient tools that enable customers to address demanding field tasks. With high-speed interfaces, gap-free streaming, and secure Linux operations, the new FieldFox D-Series redefines portable RF analysis-integrating capabilities like signal sensing, geolocation, and spectrum management into a rugged handheld platform. Its software-defined architecture allows users to add new capabilities on-site, giving them the flexibility to move quickly and be ‘first-to-market’.”



