Agilent/Keysight N9923A

The Keysight N9923A FieldFox RF Analyzer is a handheld vector network analyzer that combines spectrum analysis, network analysis, and cable/antenna testing in a single portable instrument. Built for field deployment across aerospace, defense, and telecommunications environments, it delivers laboratory-grade measurement performance with frequencies from 2 MHz to 4 GHz (upgradeable to 6 GHz). The instrument measures S-parameters, VSWR, phase, and group delay with up to four simultaneous traces, six independent markers per trace, and dynamic range reaching 90 dB with Option 122.

High-precision frequency reference (±2 ppm accuracy, ±1 ppm/yr aging) ensures measurement integrity across temperature extremes. Configurable test port power ranges from -40 dBm nominal (low power) to +5 dBm (high power at 1-port QuickCal). Data collection supports 101 to 10,001 custom-defined points per sweep, with averaging up to 999 iterations via sweep or point methods.

Technical Specifications

• Frequency Range: 2 MHz to 4 GHz (Option upgrade to 6 GHz)


• Frequency Reference: ±2 ppm accuracy; ±1 ppm/yr aging; ±1 ppm over -10 to 55 °C


• Frequency Resolution: 1 Hz (below 3.2 GHz); 1.2 Hz (above 3.2 GHz)


• Data Points: 101, 201, 401, 601, 801, 1001, 1601, 4015, 10,001 (SCPI-programmable custom counts)


• Log Magnitude Range: -1000 to 1000 dB; Resolution: 0.01 dB


• Phase Range: -180 to +180 degrees; Resolution: 0.01 degrees


• VSWR Range: 1.01 to 1000; Resolution: 0.01


• Test Port Output Power: -40 dBm nominal (low); -11 dBm to +5 dBm (high, frequency-dependent)


• Power Step Size: 1 dB increments across full range


• Dynamic Range: Up to 90 dB (with Option 122)


• Averaging: 2 to 999 iterations (sweep or point methods)


• Traces: Up to four simultaneous traces


• Markers: Six independent per trace with delta capability

Key Features

• S-parameter measurement: S11, S21 magnitude/phase (standard); S22, S12 with Option 122


• Four simultaneous S-parameters with single connection (Option 122)


• Vector voltmeter mode for phase shift, electrical length, and ratio measurements


• Display formats: Log/linear magnitude, VSWR, phase, Smith chart, polar, group delay, unwrapped phase, real/imaginary


• Distance-to-fault and absolute power measurement capability

Typical Applications Aerospace and defense field testing, telecommunications infrastructure characterization, cable and antenna validation, microwave component characterization, network troubleshooting.

Compatibility & Integration SCPI command interface supports custom sweep configurations and remote measurement control.