The Keysight N9938A FieldFox is a handheld microwave spectrum analyzer integrating spectrum analysis, cable and antenna analysis, and power measurement into a single rugged instrument for field deployment. Operating from 100 kHz to 26.5 GHz, it delivers ±0.5 dB amplitude accuracy without warm-up and achieves -155 dBm displayed average noise level at 1 GHz. The 10 MHz real-time bandwidth captures intermittent signals and radar pulse profiles with ≥105 dB spur-free dynamic range and -111 dBc/Hz phase noise at 10 kHz offset.
Technical Specifications
Spectrum Analyzer
• Frequency range: 100 kHz to 26.5 GHz (tunable to 0 Hz)
• Amplitude accuracy: ±0.5 dB (full band, -10 to +55°C)
• DANL @ 1 GHz: -155 dBm
• Spur-free dynamic range: ≥105 dB
• Phase noise: -111 dBc/Hz at 10 kHz offset (1 GHz)
• Real-time bandwidth: 10 MHz
• Maximum analysis bandwidth: 10 MHz
Power Meter
• Frequency range: 100 kHz to 26.5 GHz
• Supports average and pulse power measurement with USB power sensors (9 kHz to 24 GHz sensor-dependent)
Cable and Antenna Analyzer
• VSWR and reflection measurements (optional)
• Included in base model
– Key Features
• InstAlign automatic internal amplitude alignment for immediate measurement accuracy
• 10 MHz gap-free real-time bandwidth for intermittent signal capture
• I/Q data streaming to 1 MHz bandwidth in VITA format with GPS precision timestamping
• GPS/GNSS geolocation and timestamping
• Two Type-N(f) connectors; optional 3.5 mm conversion with Option 100
• 3.5-inch color LCD or transreflective VGA-LED display
• Water-resistant, fan-less design; MIL-PRF-28800F Class 2 and MIL-STD-810G compliant
• Weight: 3.0 kg (6.6 lb)
• Operating temperature: -10 to +55°C
• Li-ion battery: 3.5 hour runtime
• USB and LAN connectivity
– Typical Applications
• Spectrum monitoring and RF interference identification in microwave bands
• 5G TF and LTE over-the-air measurements
• Radar pulse characterization and analysis
• Cable and antenna field verification
– Compatibility & Integration
Full-band tracking generator support available. Optional reflection measurement capability requires 3.5 mm connectors (Option 320).
