The Keysight FieldFox D-Series represents the latest generation of professional handheld analyzers for field use and combines the highest measurement performance with state-of-the-art software-defined radio functionality. The devices cover frequency ranges up to 54 GHz and offer a real bandwidth of up to 120 MHz - ideal for 5G-FR1/FR2 tests, satellite communication, radar, EMC and EMF measurements as well as demanding spectrum analyses in military or industrial environments.
Thanks to the new Linux operating system, users benefit from increased system security, an optimized operating concept and improved remote control. The integrated SFP+ ports (10 GbE) enable ultra-fast, seamless streaming of IQ data - a decisive advantage for real-time analysis, interference management, TDoA/AoA location procedures or AI-supported signal evaluation.
Compared to the Keysight FieldFox C series, the D series sets new standards: It offers higher analysis bandwidths (up to 120 MHz), a modern touch display, high-speed SFP+ interfaces and a completely revised security and operating system concept. While the C series takes a software-defined approach, the D series is clearly geared towards high-frequency applications with advanced demodulation and streaming functions and thus meets the requirements of current 5G, satellite and radar networks far more comprehensively.
The N9937D model presented here is part of the powerful range of D series signal analyzers and offers an extended frequency range of up to 18 GHz. This makes it ideal for applications in the latest generation of mobile networks (FR1), industrial sensors, satellite communications in the upper SHF/Ku band, radar and defense applications as well as general RF diagnostics and interference analysis in the extended microwave range.
The N9937D - like all D-Series models - offers the complete 120 MHz real-time bandwidth and 120 MHz gapless IQ streaming. Its extended frequency range makes it particularly suitable for broadband measurement tasks, burst signals, transient acquisition, spectrum monitoring or the analysis of complex modulation formats in the upper microwave range. Thanks to Linux OS, SFP+ interfaces and advanced RTSA functions, the N9937D is a powerful tool for modern RF and spectrum workflows.
Features of the N9937D:
- Frequency range up to 18 GHz - ideal for 5G-FR1, Ku-band satcom, radar, industrial RF applications and demanding radio infrastructures
- 120 MHz RTSA bandwidth - perfect for fast transients, radar pulses, burst signals and highly dynamic spectra
- 120 MHz seamless IQ streaming via SFP+ (10 GbE) and USB-C/LAN
- Advanced spectrum analysis: Real-time spectrum analysis, spectrograms, interference search, channel assignment and occupancy analyses
- Compatible with spectrum management software (e. B. for TDoA/AoA localization and AI-based signal assessment)
- Supports software options such as noise figure, OTA-5G/LTE measurements, EMF/EMI analysis and other advanced features
- Rugged, field-ready design for industrial, cellular, power, research, government and military
Technical product features of the series:
- Frequency range: 30/300 kHz to 54 GHz (depending on model)
- Real-time bandwidth: up to 120 MHz (RTSA)
- IQ streaming: up to 120 MHz, VITA 49 format, streamable via SFP+, USB-C or LAN
- Operating system: Linux-based for enhanced security
- Interfaces: 2× SFP+ (10 GbE), USB-C, USB-A, LAN, GPS/GNSS integrated
- Display: Touchscreen for simplified operation in the field
- Vector Network Analyzer: 2-port S-parameters, up to 117 dB dynamic range (model-dependent, N991x series)
- Spectrum Analyzer: Phase Noise up to -117 dBc/Hz, DANL up to -163 dBm (with preamplifier)
- RTSA functions: 100% POI, detection of up to 47 ns short signals
- Cable and antenna tests (CAT): DTF, TDR, RL/VSWR, insertion loss measurements (model-dependent, N991x series)
- OTA measurements: LTE, 5G NR FR1/FR2, beamforming analysis
- Pulse generator (option): CW, AM/FM, FSK, BPSK, chirp pulses (model-dependent up to maximum frequency)
- GNSS/GPS: Geotagging for measurement data, synchronization for TDoA
- Streaming compatibility: KSMS, VSA 89600, MATLAB, Python
- Ruggedness: MIL-STD-810G, IP-protected, up to 4.5 h battery life
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