Agilent/Keysight N9953B

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

• 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.