The Keysight N9933C FieldFox C is a handheld microwave spectrum analyzer built for field testing across 3 kHz to 4 GHz. This portable instrument delivers real-time spectrum analysis with up to 120 MHz gap-free bandwidth and measurement accuracy of ±0.15 dB without warmup. A dynamic range exceeding 104 dBc and third-order intercept of +10 dBm at 1 GHz enable signal detection in challenging RF environments.
Completely sealed construction with water-resistant chassis and keypad meets MIL-PRF-28800F Class 2 and MIL-STD-810G Method 511.5 requirements. Type-tested for operation in explosive environments and IEC/EN 60529 ingress protection compliance. Weighing 3.4 kg, the instrument withstands drops and operates across -10 to +55 °C.
Technical Specifications
• Frequency range: 3 kHz to 4 GHz
• Analysis bandwidth: 10 MHz, 40 MHz, or 120 MHz (maximum)
• Real-time bandwidth: Up to 120 MHz gap-free
• Measurement accuracy: ±0.15 dB (without warmup)
• Dynamic range: >104 dBc
• Third-order intercept (TOI) @ 1 GHz: +10 dBm
• Standard attenuator step: 5 dB/step
• Form factor: Handheld
• Weight: 3.4 kg (7.4 lb)
• Operating temperature: -10 to +55 °C
– Key Features
• Two built-in test ports with Type-N (f) connectors
• One internal signal source
• Real-time signal analysis with I/Q data capture capability
• GPS/GNSS geolocation and timestamping
• AM/FM tune and listen functions
• Frequency counter marker and antenna factor compensation
• Software-configurable options for vector network analysis and integrated power meter functionality
– Typical Applications
• 5G NR and LTE over-the-air (OTA) measurements
• RF coverage mapping and field strength analysis
• Adjacent channel power and spectrum emission mask evaluation
• Occupied bandwidth and channel power assessment
• Routine maintenance and in-depth RF troubleshooting
– Compatibility & Integration
• USB power sensor measurements via optional N9933CU/208
• Remote control capability available with optional N9933CU/030
• Return loss and VSWR measurements available with Option 320
