Never Sacrifice Capability or Portability

Keysight's FieldFox portable analyzers are equipped to handle your toughest working environments during routine maintenance, in-depth troubleshooting, and anything in between. Choose the Keysight FieldFox configuration that best meets your needs.

  • Make accurate spectrum analyzer measurements (± 0.5 dB) without warmup.
  • Capture intermittent signals with 10 MHz gap-free, real-time bandwidth.
  • Characterize radar pulse profiles with a portable solution.
  • Perform over-the-air measurements for 5G TF and LTE.
  • Capture I/Q data for RF signal monitoring and analysis.
  • Use GPS/GNSS for geolocation and timestamping.
  • Carry one lightweight unit at 3.2 kg (7.1 lb).

What's included:

  • AC/DC adapter
  • Localized power cord
  • Rechargeable Li-ion battery
  • Soft carrying case with backpack and shoulder straps
  • Quick Reference Guide

N9961A FieldFox Handheld Software

Make your FieldFox handheld analyzer more capable with convenient software upgrades — engineered to deliver precise measurements in the field.

  • Carry one portable instrument that handles routine maintenance and in-depth troubleshooting
  • Configure as a spectrum analyzer, built-in power meter, tracking generator, and more
  • Order software pre-installed or upgrade an existing instrument

Key Specifications

Number of Built-In Ports
2 ports
Maximum Frequency
44 GHz
Number of Built-In Ports
Maximum Frequency
2 ports
44 GHz
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Additional SA Based Features:
Real-Time Spectrum Analysis
Noise Figure Measurements
Over-The-Air Measurements
Built-In Power Meter
Extended Range Transmission Analysis (ERTA)
AM/FM Tune and Listen
Field Strength Measurement
SCPI Code Compatibility
Stimulus Response
89600 VSA Software
Over-The-Air LTE FDD and 5GTF
10 MHz
Bandwidth Options:
10 MHz
Cable and Antenna Analyzer:
DANL @1 GHz:
-159 dBm
Form Factor:
44 GHz
Instrument Type:
Spectrum Analyzer
Maximum Analysis Bandwidth:
10 MHz
Maximum Frequency:
44 GHz
Maximum Real-Time Bandwidth:
10 MHZ
Number of Built-In Ports:
2 ports
Output Power:
Up to 4 dBm
Overall Amplitude Accuracy:
±0.3 dB
Phase Noise @1 GHz (1 MHz offset):
-113 dBc/Hz
Phase Noise @1 GHz (10 kHz offset):
-111 dBc/Hz
Phase Noise @1 GHz (30 kHz offset):
-108 dBc/Hz
Power Measurement Using USB Sensor:
CW or Swept-Frequency
RF Pulse Test with Peak Sensor
SA Start Frequency:
5 kHz
Spectrum Analyzer:
Yes - Standard
Standard Attenuator Range:
30 dB
Standard Attenuator Step:
5 dB
System Features:
GPS Receiver - Internal Only
Remote Control Capability
Built-In DC Source
TOI @1 GHz (3rd Order Intercept):
+13 dBm
Vector Network Analyzer:

PathWave Vector Signal Analysis (89600 VSA) Software

  • Record signals in the field and evaluate them later using 89600 VSA
  • Demodulate and perform comprehensive vector signal analysis to optimize your deployment
  • Decode and verify MAC, RLC, and RRC-layer messages across multiple radio frames
  • Analyze and troubleshoot signals in cellular, wireless-connectivity, aerospace, defense, and general-purpose applications


PathWave Vector Signal Analysis Software

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