Agilent/Keysight N9918A

The Keysight N9918A FieldFox is a handheld microwave analyzer combining cable and antenna analysis with optional vector network analysis, spectrum analysis, and power meter capabilities. Operating from 30 kHz to 26.5 GHz, this 3.0 kg instrument delivers field-portable measurements with bench-level performance across S-parameter analysis, distance-to-fault detection, and spectral characterization. The dual-port architecture supports full 2-port S-parameter measurement (S11, S21, S22, S12) with magnitude and phase, mixed-mode parameters, and time-domain analysis via Vector Network Analyzer option.

Maximum dynamic range reaches 91 dBm with spur-free performance exceeding 105 dB.

Technical Specifications

• Frequency Range: 30 kHz to 26.5 GHz (VNA/CAT/RF source modes); 5 kHz to 26.5 GHz (spectrum analyzer); variable minimums by function


• Dynamic Range: 91 dBm maximum; ≥105 dB spur-free


• Output Power: –4 dBm maximum; –1 dBm (3–6.5 GHz sweep); –45 dBm (flattened across band)


• Amplitude Accuracy (SA): ±0.6 dB full band over full temperature range; ±0.5 dB without warm-up


• Trace Noise: 0.004 dB rms


• VNA Dynamic Range: 100 dB to 9 GHz; 90 dB to 18 GHz


• IQ Streaming Bandwidth: 1 MHz maximum


• Analysis Bandwidth: 10 MHz maximum


• Sweep Speed: 432 µs per point (1001-point sweep)


• Display: Color


• Dimensions: 11.5 in (H) × 2.8 in (L)


• Weight: 3.0 kg (6.6 lb)


• Operating Temperature: –10 to +55 °C

Key Features

• Dual-port vector network analyzer with S-parameter measurement (magnitude/phase)


• Built-in cable and antenna analyzer with distance-to-fault and return loss measurement


• Integrated spectrum analyzer with 105 dB spur-free dynamic range


• RF source with settable power output in 1 dB steps


• Mixed-mode S-parameter analysis


• Time-domain VNA option for transient characterization


• Power settling control across full output range

Typical Applications

• Cable and transmission line fault location


• Component and network characterization (S-parameters)


• Antenna and filter performance validation


• Spectral emission and interference analysis


• In-field RF troubleshooting and maintenance

Compatibility & Integration VNA, spectrum analysis, and power meter functions require optional software licenses. Time-domain analysis available via Option 010.