Agilent/Keysight N9934C

The Keysight N9934C FieldFox is a handheld signal analyzer delivering spectrum analysis, power measurement, and field testing capabilities across 3 kHz to 6.5 GHz. Built for field engineers and technicians, it combines four-trace spectrum analysis with precision power metering and real-time signal monitoring in a portable 3.4 kg package. The N9934C excels at characterizing RF devices, validating antenna performance, and troubleshooting signal integrity in applications where bench equipment cannot reach.

Technical Specifications

Frequency Coverage: 3 kHz to 6.5 GHz Amplitude Accuracy: ±0.20 dB overall Noise Performance: -164 dBm DANL at 1 GHz; -124 dBc/Hz phase noise at 1 MHz offset; -112 dBc/Hz at 10 kHz offset; -113 dBc/Hz at 30 kHz offset Dynamic Range: >104 dBc system dynamic range; +10 dBm TOI at 1 GHz Analysis Bandwidth: 10 MHz standard; optional 40 MHz or 120 MHz; real-time spectrum analysis to 120 MHz gap-free; IQ streaming to 1 MHz RF Connectivity: Two Type-N (f) test ports; one internal source; optional 3.5 mm connectors available Attenuator: 0 to 40 dB range in 5 dB steps Environmental: -10 to 55°C operating temperature; 3.4 kg weight

Key Features

• Four-trace spectrum analysis with selectable detector types and radio standard masks


• Channel power, occupied bandwidth, adjacent channel power, and spectrum emission mask measurements


• AM/FM tune and listen capability with frequency counter marker


• Field strength measurements supporting antenna factors


• Built-in power meter with external RF and microwave power sensor support


• InstAlign technology for immediate power measurement accuracy without warm-up cycles


• PowerSuite channelized measurements for communication systems analysis


• Rechargeable Li-ion battery with AC/DC adapter

Typical Applications

• Cable and connector characterization in field environments


• Antenna performance validation and diagnostics.


• Spectrum occupancy surveys and interference identification


• Transmitter power and modulation quality assessment


• Signal integrity verification across RF networks

Compatibility & Integration Supports external RF and microwave power sensors for extended measurement range. Handheld form factor with soft carrying case, backpack straps, and quick reference guide included.