The Keysight N9938A FieldFox is a portable, battery-operated microwave spectrum analyzer engineered for field testing and troubleshooting across satellite communications, microwave backhaul, military communications, and radar systems. Operating from 5 kHz to 26.5 GHz, it delivers amplitude accuracy of ±0.5 dB without warm-up and spur-free dynamic range exceeding 105 dB. The instrument combines spectrum analysis, optional tracking generator (30 kHz to 26.5 GHz), and built-in power meter (100 kHz to 26.5 GHz) in a rugged, dust-free, fanless chassis that meets MIL-PRF-28800F Class 2 and MIL-STD-810G standards. Weighing 6.6 lb, the N9938A delivers gap-free real-time analysis with 10 MHz bandwidth and extends measurement capability through I/Q data capture, time gating for pulsed RF, GPS/GNSS geolocation, and optional vector network analyzer functionality.
Technical Specifications
• Frequency Range: 5 kHz to 26.5 GHz (spectrum analysis); 30 kHz to 26.5 GHz (tracking generator); 100 kHz to 26.5 GHz (power meter)
• Amplitude Accuracy: ±0.5 dB without warm-up
• Spur-Free Dynamic Range: ≥105 dB
• Phase Noise: −111 dBc/Hz at 10 kHz offset
• Third-Order Intercept: +15 dBm
• Real-Time Bandwidth: 10 MHz (gap-free)
• Display: 6.5″ color LCD
• Temperature Range: −10 to +55°C
• Battery Life: Up to 4 hours
• Weight: 6.6 lb (3.0 kg)
– Key Features
• Type-N(f) standard ports; configurable to 3.5 mm connectors
• Optional preamplifier and tracking generator
• Interference analyzer and spectrogram with real-time display
• VSWR and reflection measurements
• Channel power, occupied bandwidth, and adjacent channel power ratio analysis
• Time gating for pulsed-RF signal isolation
• I/Q data capture for signal characterization
• GPS/GNSS timestamping and geolocation
• EMF and EMI measurement capability
• Time domain reflectometry (Option 215)
• Dust-free, fanless design; water-resistant construction
– Typical Applications
• Satellite communications link verification
• Microwave backhaul deployment and maintenance
• Military communications troubleshooting
• Radar system characterization and interference detection
– Compatibility & Integration
Connects to PathWave Vector Signal Analysis (89600 VSA) software and supports extended range transmission analysis. External equipment integration via 25 MHz bandwidth IF output enables deep signal analysis with real-time oscilloscopes and vector signal analyzers. USB and LAN interfaces support remote control and data transfer.
