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 Performance
• 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.
