The Keysight N9953B FieldFox is a handheld microwave analyzer that combines vector network analysis, spectrum analysis, and cable/antenna testing into a single portable instrument. Weighing 3.4 kg, it delivers benchtop-level measurement accuracy in field environments, spanning routine maintenance to complex troubleshooting across microwave communication systems. The platform uses software-enabled configuration, allowing operators to add measurement functions via licensed options to match specific application requirements.
Technical Specifications
Frequency Coverage
• Minimum: 300 kHz (CAT/VNA), 9 kHz (Spectrum Analyzer)
• Maximum: 54 GHz (standard); 110 GHz (with millimeter-wave downconverter option)
• Analysis bandwidth: 120 MHz
• Real-time bandwidth: 120 MHz gap-free
• Maximum IQ streaming bandwidth: 1 MHz
Performance
• System dynamic range: 115 dB (simultaneous four S-parameter measurement)
• Spectrum analyzer accuracy: ±0.3 dB (without warm-up)
• Phase noise: −113 dBc/Hz @ 1 GHz (10 kHz offset)
– Key Features
Vector Network Analyzer (VNA)
• Simultaneous measurement of all four S-parameters
• Full 2-port S-parameter capability
• 1-port mixed-mode S-parameters
• TDR cable measurements
• Vector voltmeter functionality (option)
Cable and Antenna Tester (CAT)
• Standard on base model
• DTF (dB, linear, VSWR) measurements
• Return loss and return loss dB analysis
• 1-port cable loss characterization
Spectrum Analyzer (SA)
• 9 kHz to 54 GHz frequency range (option)
• Accurate measurements without warm-up requirement
Additional Capabilities
• Real-time spectrum analysis
• Over-the-air (OTA) measurements for 5G NR and LTE
• Built-in power meter
• Integrated downconverter support for millimeter-wave extension
– Typical Applications
Microwave communication system field testing, cable and connector validation, antenna characterization, transmission line diagnostics, 5G NR and LTE network deployment and maintenance.
– Compatibility & Integration
Software-driven architecture enables selective activation of measurement suites without hardware redesign, reducing cost and complexity in multi-function field deployments.
