The Keysight N9961A FieldFox is a handheld microwave spectrum analyzer engineered for field deployment in demanding environments. It delivers accurate spectrum analysis, cable and antenna testing, and network analysis without warm-up delay. The instrument captures intermittent signals across a 10 MHz gap-free real-time bandwidth and characterizes radar pulse profiles with precision. Its dual 2.4 mm RF input ports support over-the-air measurements for 5G and LTE, I/Q data capture, noise figure analysis, and field strength measurement. GPS/GNSS integration enables geolocation and timestamping of events. The rugged, fan-free design with anti-glare 6.5-inch display and backlit keypad performs reliably in harsh field conditions.
Technical Specifications
Frequency Range: 9 kHz to 44 GHz
Spectrum Analysis Performance
• Amplitude accuracy: ±0.5 dB without warm-up
• Dynamic range: 96 dB in spectrum analysis mode; TOI >+15 dBm
• DANL: −138 to −108 dBm/Hz
• Phase noise: −111 dBc/Hz at 10 kHz offset
• Resolution bandwidth: 10 Hz to 5 MHz
• Real-time bandwidth: 10 MHz gap-free
Measurement Capabilities
• Radar pulse profile characterization
• Intermittent signal capture
• Noise figure measurements
• I/Q data capture for RF signal analysis
• Over-the-air measurements for 5G TF and LTE
• Field strength measurement with spectrogram display
• AM/FM tune and listen
• Built-in power meter with extended range transmission analysis (ERTA)
• Stimulus-response analysis
RF Specifications
• Input ports: 2 (2.4 mm male connectors)
• Maximum input level: +10 dBm (0.15 dB compression 500 MHz–1 GHz); +10 dBm typical 0.10 dB compression (>1–26.5 GHz)
• Output power: up to 4 dBm
• IF output: 25 MHz bandwidth
Physical & Power
• Dimensions: 292 mm H × 188 mm W
• Weight: 3.2 kg
• Display: 6.5-inch anti-glare LCD with LED backlight
• Power: AC or rechargeable Li-ion battery
• Design: Rugged, dust-free, no fans or vents
– Key Features
• Dual-port architecture for simultaneous two-port measurements
• No warm-up required; immediate measurement capability
• GPS/GNSS for synchronized geolocation and timestamping
• Superior phase noise performance (−111 dBc/Hz @ 10 kHz offset)
• Backlit keypad and anti-glare display for outdoor operation
– Typical Applications
• Field maintenance and troubleshooting on installed systems
• Radar pulse characterization and analysis
• 5G and LTE over-the-air signal verification
• Cable and antenna performance validation
• Spectrum monitoring with real-time signal capture
• Noise figure and transmission analysis
– Compatibility & Integration
• Ethernet connectivity to 89600 VSA software on Windows PC or tablet
• USB power sensor support
• IF output port for external signal processing
