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.

  • Standard model includes cable and antenna analyzer (CAT)
  • Expand capabilities with optional T/R vector network analyzer, spectrum analyzer, built-in power meter, and more
  • Save time by measuring return loss and distance-to-fault simultaneously
  • Calibrate easily in the field with QuickCal
  • Measure average and pulse power with a USB power sensor
  • Use the industry's lightest all-in-one analyzer at only 2.8 kg (6.2 lb)
  • CAT and VNA: 2 MHz to 4/6 GHz
  • SA: 100 kHz to 4/6 GHz

What's included:

  • AC/DC adapter
  • Localized power cord
  • Rechargeable Li-ion battery
  • LAN cable
  • Soft carrying case with backpack and shoulder strap
  • Quick Reference Guide + User Guide
EU customers only:
  • Contact Keysight Authorized Distributors for quotation and ordering. This model is no longer available directly from Keysight due to lack of compliance with EU RoHS 2011/65/EU.


Number of Built-In Ports
2 ports
Maximum Frequency
4 or 6 GHz
Output Power
Up to 8 dBm
Number of Built-In Ports
Maximum Frequency
Output Power
2 ports
4 or 6 GHz
Up to 8 dBm
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Additional CAT/VNA Based Features:
QuickCal (Subset)
DTF/TDR Cable Measurements
Mixed-Mode S-Parameters
Vector Voltmeter
Additional SA Based Features:
Built-In Power Meter
Applications-General Purpose:
AM/FM Tune and Listen
Cable and Antenna Analysis
Field Strength Measurement
Stimulus Response
Bandwidth Options:
10 MHz (standard)
Cable and Antenna Analyzer:
Yes - Standard
DANL @1 GHz:
-148 dBm
4 or 6 GHz
Instrument Type:
Combination Analyzer
Maximum Analysis Bandwidth:
10 MHZ
Maximum Frequency:
4 or 6 GHz
Minimum Frequency:
2 MHz
Number of Built-In Ports:
2 ports
Output Power:
Up to 8 dBm
Overall Amplitude Accuracy:
±0.35 dB
Phase Noise @1 GHz (1 MHz offset):
-115 dBc/Hz
Phase Noise @1 GHz (10 kHz offset):
-88 dBc/Hz
Phase Noise @1 GHz (30 kHz offset):
-89 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 - Optional
Standard Attenuator Range:
31 dB
Standard Attenuator Step:
1 dB
System Dynamic Range:
72 dB
System Features:
GPS Receiver - External Only
Remote Control Capability
TOI @1 GHz (3rd Order Intercept):
+18 dBm
Vector Network Analyzer:
Yes - Optional

N9912A 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 VNA, spectrum analyzer, built-in power meter, vector voltmeter, and more.
  • Order software pre-installed or upgrade an existing instrument.


Instrument Control Software

  • Easily connect and control your handheld analyzer with no programming
  • Acquire screen images and trace data in a few clicks
  • Rapidly build custom automated test sequences in minutes
  • Includes Application Programming Interfaces (APIs) for instrument  control from your PC

Interested in the N9912A?

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