Agilent/Keysight N9936B

The Keysight N9936B FieldFox is a handheld microwave spectrum analyzer engineered for field testing and maintenance of communication systems. It delivers benchtop accuracy in a portable, rugged package weighing 3.4 kg with dimensions of 292 × 188 × 72 mm. The instrument operates across 9 kHz to 14 GHz with useable frequency down to 5 kHz, offering spectrum analysis, real-time signal capture, cable and antenna analysis, and vector network analysis capabilities.

Technical Specifications

• Frequency range: 9 kHz to 14 GHz


• Useable frequency: 5 kHz minimum


• Standard analysis bandwidth: 10 MHz


• Optional analysis bandwidth: 40 MHz (Option B04), 100 MHz (Option B10)


• Real-time bandwidth: Up to 120 MHz gap-free


• Minimum signal duration captured: 5.52 µs at 100% POI with full amplitude accuracy Measurement Accuracy


• Spectrum analyzer accuracy: ±0.3 dB without warm-up


• Displayed average noise level (DANL) @ 1 GHz: -163 dBm


• Receiver compression: +10 dBm at 500 MHz to 1 GHz (0.15 dB compression)


• Operating temperature: 23 °C ± 5 °C for optimal performance Physical & Power


• Weight: 3.4 kg with battery


• Battery life: Up to 4 hours (field swappable)


• Power: AC/DC adapter with rechargeable Li-ion

Key Features

• Real-time spectrum analysis (RTSA) with gap-free signal capture


• Built-in power meter functionality


• Pulse measurement characterization for radar applications


• I/Q data capture for RF signal monitoring


• Over-the-air (OTA) measurements supporting 5G NR and LTE


• GPS/GNSS receiver for geolocation and timestamping


• Sealed enclosure, water-resistant chassis


• MIL-PRF-28800F Class 2 and MIL-STD-810G compliance for harsh environments

Optional Capabilities

• Tracking generator


• Preamplifier


• Noise figure measurements


• Extended range transmission analysis (ERTA)


• Vector network analysis (VNA) with 2-port configuration

Typical Applications Field verification of communication system performance, cable and antenna diagnostics, interference detection and analysis, radar pulse characterization, 5G/LTE signal validation, and RF troubleshooting in remote or challenging field environments.