N9938D FieldFox Handheld Signal Analyzer, 26.5 GHz

The Keysight N9938D is a 26.5 GHz handheld signal analyzer providing a versatile, testing solution with configurations for spectrum monitoring, signal analysis and generation, and interference hunting, while delivering reliable performance in both field and lab settings. With up to 20 license‑key software options, the analyzer can be expanded to meet evolving needs, allowing technicians to carry a single portable instrument for routine maintenance and advanced troubleshooting. Its functionality can be configured to include optional features like a pre-amplifier, tracking generator, power sensor support, built-in power meter and more.

N9938D Specifications

• Maximum frequency: 26.5 GHz

• Maximum analysis bandwidth: 120 MHz

• Maximum IQ streaming bandwidth: 120 MHz

• VNA capabilities: No

• Field swappable battery lasts up to 4 hours

• Rugged enough to meet MIL-specs

• Standard three-year warranty

This base model includes basic spectrum analysis, four traces, different detector types, radio standard selection, limit lines, along with channel power, occupied bandwidth, adjacent channel power, and spectrum emission mask. Plus features, AM/FM tune and listen, field strength measurements, antenna factors, and frequency counter marker.

Key Facts

• Configure to perform spectrum analysis, pulse generation, and power measurements.

• Capture elusive signals with up to 120 MHz gap-free, real-time bandwidth.

• Stream wideband IQ data with bandwidth up to 120 MHz.

• Make accurate spectrum analyzer measurements (±0.1 dB) without requiring instrument warm-up.

• Use the intuitive touchscreen for simplified file management.

• Carry one lightweight unit at 3.6 kg (8 lb) in a rugged, weatherproof design.

A Truly Software-Defined Analyzer

The new FieldFox D-Series empowers users to capture, stream, and replay every signal event, enabling faster troubleshooting, deeper analysis, and greater confidence that no data is missed. Select the capabilities (FieldFox options) that you need. Highly configurable with license-key activation applications available. Call for a quote.

B04 – Analysis bandwidth, 40 MHz
B10 – Analysis bandwidth, 120 MHz
100 – 3.5 mm connectors (N9938D only, at purchase, cannot be added later)

Spectrum Analysis

209 – Extended Range Transmission Analysis (ERTA)
235 – Pre-amplifier
236 – Interference Analyzer and Spectrogram
238 – Spectrum Analyzer Time Gating
350 – Real-Time Spectrum Analyzer (RTSA)

5G/LTE Field Test

312 – Channel Scanner
358 – Electromagnetic Field (EMF) Measurements
370 – Over-the-Air (OTA) LTE FDD
371 – Over-the-air (OTA) LTE TDD
378 – Over-the-air (OTA) 5G NR

Power Measurements

208 – USB Power Measurements versus Frequency
302 – USB Power Sensor Support
310 – Built-in Power Meter
330 – Pulse Measurement with USB Peak Power Sensor

Utilities

030 – Remote Control Capability
307 – GPS Receiver
309 – DC Bias Variable Voltage Source
352 – Indoor and Outdoor Mapping
357 – Pulse Generator

FieldFox N99xxD-Series

The N99xxD-Series includes 14 models (combo or spectrum analyzers) to cover the maximum frequency of 14, 18, 26.5, 32, 44, 50, and 54 GHz. Each model supports more than 25 software-defined FieldFox applications. A Linux-based operating system further enhances the analyzer’s security and file management, while a touchscreen interface improves usability, efficiency, and reduces errors.

Keysight Spectrum Management Software (KSMS)

A Keysight FieldFox handheld analyzer used in conjunction with KSMS (a comprehensive PC software tool kit) works to identify, locate, and address interference concerns. With full spectrum‑optimization capabilities across RF, analog, and digital over‑the‑air demodulation, the platform enables you to monitor spectrum usage, assess utilization, and detect interference from an all-in-one solution. 30-day trial and licenses available.

Key Facts

• Monitor the spectrum from multiple FieldFox across several frequencies or antennas.

• Capture and display time-variant signals across multiple receivers.

• Report frequency band and channel utilization rate.

• Locate the source of unknown emitters and interfering signals.