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Rugged and portable for comprehensive RF field testing
Keysight FieldFox handheld spectrum analyzers include the handheld analyzers. They are a versatile tool for RF field testing, offering comprehensive capabilities in spectrum analysis, vector network analysis, power measurements, and pulse generation. With over 25 license key-activated software options, remotely upgrade your analyzer to meet your field-testing needs. Choose one of our most popular configurations or build the one you need for your application. Need help selecting? Check out the resources below.
Spectrum analysis
Identify interference, verify signal coverage, optimize performance, and use gapless IQ data for spectrum monitoring, demodulation, and 5G NR quality metrics.
Vector network analysis
Perform in-depth troubleshooting and maintenance for RF cables and antennas, identifying faults with time-domain reflectometry and measuring S-parameters.
Power measurements
Make accurate, user-definable channel power measurements with the built-in power meter. Pair with an external USB peak power sensor to efficiently characterize pulsed RF signals.
Signal generation
Generate analog modulations and user-defined pulse sequences with the built-in pulse signal generator.
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VNA capabilities
Yes - optional, No
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Maximum frequency
10 GHz to 54 GHz
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Maximum analysis bandwidth
40 MHz to 120 MHz
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Maximum IQ streaming bandwidth
1 MHz to 120 MHz
Most popular configurations
FieldFox-class Handheld Signal Analyzer
FieldFox-class Handheld Combination Analyzer
FieldFox-class Handheld Combination Analyzer
The resources below will help you determine the handheld analyzer you need for your application.
Services and support
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Frequently asked questions
A handheld spectrum analyzer is a compact, portable instrument used to measure and visualize the frequency spectrum of radio frequency (RF) signals. It displays how signal power is distributed across a range of frequencies, enabling users to identify, analyze, and troubleshoot signal behavior in the field.
Designed specifically for use outside of the lab, handheld spectrum analyzers combine the core functionality of traditional benchtop units with rugged, weather-resistant designs and battery operation, making them ideal for technicians and engineers working on-site.
Field applications include:
- Interference hunting: Locating sources of unwanted RF emissions or signal jamming
- Site installation and maintenance: Verifying frequency allocations, signal quality, and coverage during tower or base station deployment
- Signal identification: Detecting and analyzing known or interfering transmitters in crowded spectrum environments
- Antenna alignment: Measuring signal strength or field strength while physically adjusting antenna orientation
- Regulatory compliance checks: Ensuring emissions fall within licensed frequency bands and power levels
Many handheld spectrum analyzers also support modular or multi-instrument functionality, including vector network analysis (VNA), power measurements, cable and antenna tests, and even time-domain reflectometry, allowing technicians to carry one tool for a variety of RF diagnostics.
There are six fundamental field tests used to validate and optimize 5G network performance in real-world environments:
1. Path Loss Characterization
This test measures how signal strength decreases over distance in a given environment. In 5G, especially at higher frequencies like millimeter wave, signals are more easily blocked by buildings, trees, and weather. Path loss data helps engineers understand how far signals can travel and what adjustments are needed to maintain reliable coverage.
2. Base Station Coverage Testing
This test verifies the area that each 5G base station can effectively cover. Engineers use signal strength and signal-to-interference measurements to map coverage and identify weak zones, overlap between cells, or areas where users might experience dropped connections.
3. Component Carrier Power Measurements
5G often uses multiple carriers at once to deliver faster speeds. This test checks that each of these carriers is transmitting at the correct power level. It helps ensure users get consistent performance and that transmissions stay within legal and technical limits.
4. Over-the-Air Control Channel Coverage Testing
In 5G, control information such as synchronization and broadcast signals are sent using focused beams instead of wide-area broadcasts. This test checks whether user devices can reliably detect and decode those signals across the coverage area. It helps confirm that the network can properly connect and communicate with devices.
5. Network Quality and Beam Performance Verification
This test measures how well the network maintains high-speed, low-latency connections as devices move. It includes checking data speed, delay, handover between cells, and how effectively the network switches or tracks signal beams aimed at a device. These measurements reflect the real-world experience of using 5G.
6. Electromagnetic Field (EMF) Exposure Evaluation
This test measures the amount of electromagnetic energy emitted by 5G equipment in public or work areas. Engineers use calibrated sensors to ensure that energy levels stay within safety guidelines set by the government or international health organizations.
These tests provide a complete picture of 5G network performance, reliability, and safety, helping fine-tune deployments and ensure the network meets expectations.
A handheld spectrum analyzer gives you the power of RF spectrum analysis in a compact, field-ready form factor. These instruments are designed to measure key signal characteristics, such as frequency, power, bandwidth, and noise, right at the point of deployment, troubleshooting, or inspection. Unlike benchtop units, which are bulky and stationary, handheld analyzers are engineered for mobility, speed, and resilience in demanding environments.
Here are the key benefits:
1. True Portability
Handheld spectrum analyzers are lightweight, battery-powered, and easy to carry, allowing technicians and engineers to bring powerful measurement capabilities directly to the test site. Whether climbing towers, walking factory floors, or driving between locations, portability saves time and removes the need to bring equipment back to the lab.
2. Rugged and Field-Ready
These instruments are built to withstand rough handling, temperature extremes, dust, and moisture. Their durable enclosures and sealed designs ensure reliable operation in environments where lab-grade equipment would quickly fail.
3. Efficient Field Troubleshooting
Handheld analyzers are ideal for tasks like identifying unauthorized transmissions, verifying signal coverage, detecting interference, or tuning antennas, all in real-time. The ability to collect and store measurements on-site improves efficiency and reduces downtime.
4. Seamless Data Transfer and Integration
Most handheld models include USB, LAN, or wireless connectivity for easy data export, reporting, and remote control. This allows field measurements to be integrated into broader workflows, shared with off-site experts, or uploaded for regulatory documentation.
With their blend of portability, durability, and capability, handheld spectrum analyzers are crucial tools for anyone who needs to maintain or troubleshoot RF systems outside of the lab. They help ensure network uptime, reduce test time, and enable faster, more confident decisions in the field.