Keysight N9914C 6.5 GHz FieldFox Handheld RF Analyzer

Keysight N9914C 6.5 GHz FieldFox Handheld RF Analyzer

The Keysight N9914C 6.5 GHz FieldFox Handheld RF Analyzer is a portable electronic test instrument used to install, maintain, and troubleshoot radio-frequency (RF) systems. It supports measurements from 3 kHz to 6.5 GHz and combines several testing functions in one battery-powered device. Engineers and technicians can use it to examine cables, antennas, electronic components, and wireless signals directly at a job site. Its capabilities depend on the software options installed.

Its standard cable and antenna testing capability helps users evaluate how effectively an antenna system carries and accepts RF energy. Measurements such as return loss and voltage standing wave ratio (VSWR) show how much signal reflects toward the source, which can indicate a poor connection or an improperly matched antenna. Cable testing can also help locate faults along a transmission line, making it useful for investigating damaged cables and connectors.

With the optional spectrum analyzer capability, the N9914C displays signal strength across a selected range of frequencies. This helps technicians identify active signals, investigate interference, and detect unwanted emissions that could affect communication equipment. An optional real-time spectrum analysis capability provides up to 120 MHz of analysis bandwidth, helping users capture brief or intermittent signals that can be difficult to observe. 

The instrument can also function as a vector network analyzer when equipped with the appropriate options. In this mode, it measures how RF signals pass through or reflect from components such as filters, cables, and amplifiers. These measurements, called S-parameters, describe both signal magnitude and phase. They help engineers determine whether a component operates correctly across its intended frequency range and identify excessive loss or unwanted reflections. 

Designed for field use, the N9914C weighs approximately 3.4 kilograms (7.4 pounds) and includes a rechargeable battery and carrying case. Additional options support tasks such as RF power measurement, interference monitoring, and over-the-air testing of LTE and 5G NR signals within its frequency coverage. Its main practical benefit is giving technicians access to several measurement tools in one portable instrument, allowing them to diagnose problems where equipment is installed.

Features:

• Frequency coverage: 3 kHz to 6.5 GHz.
• Cable and antenna testing: Measures return loss and VSWR to evaluate cables, connectors, and antennas.
• Cable fault location: Helps identify the distance to damaged cables or faulty connections.
• Optional spectrum analysis: Displays signal strength across frequencies to investigate interference and unwanted signals.
• Optional real-time spectrum analysis: Captures brief or intermittent signals with up to 120 MHz of analysis bandwidth.
• Optional vector network analysis: Measures signal transmission and reflection, including full two-port S-parameters.
• Optional interference analysis and spectrogram: Shows how signals change over time.
• Optional RF power measurements: Supports a built-in power meter and external USB power sensors.
• Optional LTE and 5G NR measurements: Supports over-the-air testing within its frequency range.
• GPS/GNSS support: Enables location tagging and measurement timestamps with the appropriate configuration.
• Portable construction: Weighs approximately 3.4 kg (7.4 lb).
• Battery operation: Includes a rechargeable lithium-ion battery, AC/DC adapter, and carrying case.
• Software upgrades: Allows additional measurement capabilities to be enabled as needs change.