The Keysight N9938B FieldFox is a handheld spectrum analyzer delivering lab-grade RF and microwave measurements in field environments. Operating from 9 kHz to 26.5 GHz, this ruggedized instrument combines spectrum analysis, network analysis, and cable/antenna characterization in a single 3.4 kg unit. Engineers and technicians deploy it for wireless infrastructure maintenance, radar diagnostics, 5G NR and LTE over-the-air measurements, and signal monitoring across demanding field conditions.
– Technical Specifications
Frequency Performance
• Frequency Range: 9 kHz to 26.5 GHz (usable to 5 kHz)
• Analysis Bandwidth: 10 MHz standard; optional 40 MHz, 100 MHz, or 120 MHz configurations
• Maximum IQ Streaming Bandwidth: 1 MHz
Measurement Accuracy
• Spectrum Analyzer Accuracy: ±0.3 dB (without warmup)
• Amplitude Accuracy: ±0.3 dB
• Displayed Average Noise Level @ 1 GHz: -163 dBm
• Spur-Free Dynamic Range: ≥105 dB
• Dynamic Range: 117 dB
Physical & Environmental
• Form Factor: Handheld
• Weight: 3.4 kg (7.4 lb)
• Operating Temperature: -10 to +55 °C
• Environmental Rating: IEC/EN 60529 ingress protection; MIL-PRF-28800F Class 2; MIL-STD-810G Method 511.5 Procedure I
• Construction: Water-resistant chassis, keypad, and case
– Key Features
• Capture intermittent signals with gap-free, real-time bandwidth to 120 MHz
• Radar pulse profile characterization
• I/Q data capture for RF signal monitoring and analysis
• Real-Time Spectrum Analysis (RTSA) option (N9938B-350)
• I/Q Analyzer option (N9938B-351)
• Analog Demodulation option (N9938B-355)
• Noise Figure Measurements option (N9938B-356)
• EMI Measurements option (N9938B-361)
– Typical Applications
• 5G NR and LTE over-the-air testing
• Wireless infrastructure field maintenance
• Radar system diagnostics
• RF signal characterization in field deployments
• Cable and antenna verification
– Compatibility & Integration
The N9938B supports multiple measurement modes and optional software licenses to extend functionality across spectrum analysis, network analysis, and signal demodulation workflows.
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