Keysight N9935B FieldFox Handheld Microwave Spectrum Analyser, 9 GHz

A lightweight, durable, microwave spectrum analyser, interference analyser, distance-tracking generator, preamplifier, power meter, and more

Keysight's FieldFox portable analysers are equipped to handle your toughest working environments during routine maintenance, in-depth troubleshooting, and anything in between.

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Keysight N9935B FieldFox Handheld Microwave Spectrum Analyser, 9 GHz Product Description

FieldFox, the industry's most versatile portable analyser, has launched this new line of future-ready analysers to address the ever-increasing demands of 5G, satellite communications, signal monitoring and electronic warfare applications. All existing FieldFox A Series measurement capabilities (except QuickCal) are supported on the new FieldFox B Series. 100 MHz (Option B10) and 40 MHz (Option B04) analysis bandwidth options will be available on the B models, with 10 MHz as the standard option

Industry's most precise handheld analyser with optional 100 MHz RTSA

  • Easily capture intermittent beam sweeping technologies used in 5G and radar systems
  • Detect small signals once masked by stronger signals
  • Capture signals as narrow as 5.52 µs with 100% POI and full amplitude accuracy
  • Accelerate communication system development by quickly switching to over-the-air (OTA) measurements


  • N9935B - 9 GHz FieldFox Microwave Analyser
  • Expand capabilities with optional real-time spectrum analyser or tracking generator
  • Make accurate spectrum analyser measurements (±0.3 dB) without warm-up
  • Capture intermittent signals with 100 MHz gap-free real-time bandwidth
  • Portable solution for radar pulse profile characterization
  • Supports over-the-air measurements for 5GTF and LTE
  • Ideal I/Q data capture tool for RF signal monitoring and analysis
  • GPS/GNSS receiver for geolocation and timestamping
  • Lightest all-in-one analyser at 7.35 lb.

Keysight N9935B FieldFox Handheld Microwave Spectrum Analyser, 9 GHz Resources

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