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N9912A FieldFox RF Handheld Analyzer 4/6 GHz

Technical Overviews

Carry Precision with You

Every piece of gear in your kit had to prove its worth. Measuring up and earning a spot in your field kit is the driving idea behind Keysight’s FieldFox RF analyzer. It is equipped to handle routine maintenance, in-depth troubleshooting and anything in between.

Starting with adaptability: every operating mode is flexible enough to meet the needs of novices and experts alike. To accelerate your work, each mode has a task-driven interface that saves time in the field. Best of all, FieldFox is designed to withstand your toughest working conditions.

Add FieldFox to your kit and carry precision with you.

World’s Most Integrated Handheld RF Analyzer

Key measurements

  • Cable and antenna test, distance-to-fault, return loss, cable loss
  • Vector network analysis with Smith chart display and time domain
  • Spectrum analyzer, channel scanner, CHP, ACPR, OBW
  • Interference analyzer, spectrogram, waterfall, record and playback
  • Independent source, CW and tracking
  • Vector voltmeter
  • Power measurements using USB power sensor, built-in power meter and pulse measurements

Key differentiators

  • Immediate measurements with CalReady, 50 percent faster than traditional handheld instruments
  • Integrated QuickCal calibrates for simple field measurements- no calibration kit required
  • Superior dynamic range (96 dB) and sensitivity (-148 dBm) in the spectrum analysis mode

Cable and antenna analyzer

Fifty to sixty percent of cell site problems are caused by faulty cables, connectors, and antennas. Degraded feed lines cause poor coverage, unncessary handovers, paging failures and access failures on uplink. To avoid service quality problems, it is critical to keep cell sites’ cable and antenna systems in good condition.

Return loss and DTF measure­ments

FieldFox can make both return loss and distance-to-fault measurements at the same time. This helps you correlate overall system degradation with specific faults in the cable and antenna system.

The built-in cable editor allows you to edit existing cable types on-site, and save them as new cable types with user defined names.

CalReady-calibrated at power on and ready to go

Each instrument is CalReady at the RF Out port, immediately following power-on or preset. This means it’s already calibrated and ready to make measurements such as one-port cable loss, VSWR, return loss, and DTF measurements at the test port.

Hassle-free calibration in the field with QuickCal

FieldFox comes with a built-in calibration capability that allows you to calibrate the network analyzer without carrying a cal kit into the field. With any other test instru­ment, when you add additional devices to the test port, such as jumper cables or adapters, you need to recalibrate using a cal kit.

Broadband calibration

FieldFox allows you to make broadbandcalibrations, which means the instrumentis calibrated over the maximum frequency span. After a broadband calibration, you can change the frequency range or number of points without recalibrating the instrument.

Spectrum analyzer

Interference is a major source of cell site problems. Interference can be internal or

external, and uplink or downlink. Down­link interference reduces coverage, while uplink interference causes access failure. Interference has a direct impact on the quality of service of wireless communica­tion services.

Field strength measurements

Field strength characterization is a com­mon test performed by operators in the field. To make accurate measurements, the gain and loss of the antenna and cables need to be accounted for. With FieldFox, antenna factors and cable loss data can be loaded using either the front panel or the Data Link software.

Independent signal source

FieldFox has a built-in independent signal source, with a frequency range of up to 4/6 GHz. The signal source can be tuned to any frequency, independent of the spectrum analyzer frequency. You can use the signal source to create a test signal to measure coverage, antenna isolation, antenna direction alignment, and shielding effectiveness, frequency-offset devices and long cable loss measurement.

Interference analyzer

Interference can be internal or external, uplink or downlink, and has a direct impact on the quality of service (QoS) of a com­munication network. FieldFox’s interfer­ence analyzer is designed to identify interference signals quickly.

Channel scanner

Channel scanner allows users to make multiple channel power measurements simultaneously. It is used to verify wireless network coverage, path loss and potential interference issues. It also can be used to measure primary carriers and their intermodulated products.

Network analysis

FieldFox RF analyzer can be configured

with VNA transmission/relection (T/R) capability for S11 and S21 measurements.

Transmission measurement

FieldFox provides a 2-port transmission measurement that measures insertion loss, amplifier gain, filter passband, and loss. It also makes a S21 scalar measure­ment if Option 303 is enabled.

Network analyzer time domain

With the time domain Option, FieldFox computes the inverse Fourier transform of the frequency-domain data to display re­flection or transmission coefficients versus time. Time domain gating can be used to remove unwanted responses such as con­nector mismatch or cable discontinuities, and the results can be displayed in either time or frequency domain.

FieldFox’s time domain function supports both low pass mode and band pass mode, enabling users to measure both broad­band and frequency-selective devices


Vector voltmeter

Using FieldFox’s vector voltmeter (VVM), you can measure the phase shift and electrical length of a device. By utilizing the “Zero” function, the phase and electri­cal length of one device can be measured relative to a “golden device”. View results on the large display which can be seen as far as ten feet away.

USB power measurements

FieldFox RF can connect with the Keysight USB power sensors to make RF power measurements. Using USB peak power sensors, users can measure both the aver­age and the peak power of a modulated signal.

USB power measurements versus frequency

In addition to power measurements at a single CW frequency, you can measure power versus frequency - a swept mea­surement. FieldFox’s source frequency can be set equal to the sensor/receiver frequency, or with an offset. The frequency of both the source and receiver are swept, and the two track each other. The offset frequency can be negative, zero, or posi­tive.

Pulse measurements

FieldFox’s pulse measurement option al­lows you to efficiently characterize pulsed RF signals such as those used in radar and electronic warfare systems, leverag­ing the Keysight USB peak power sensors. Measurements include peak power, peak to average ratio, and pulse profile param­eters such as rise time, fall time and pulse repetition frequency.

Remote control capability with iPad and iPhone

Engineers and technicians can now re­motely monitor and control their FieldFox using their iOS device such as an iPhone, iPad, or iPod Touch. FieldFox’s Remote Viewer iOS app emulates the front panel of the unit, letting you simply press any FieldFox key right from your iOS device. The app also allows you to instantly ac­cess technical documents such as data sheets.

FieldFox’s Data Link software makes report generation and documentation easier

FieldFox’s complimentary Data Link soft­ware provides data transfer, data defini­tion and report generation. You can add markers and limit lines to traces, and you can load cable files and antenna factors using Data Link

Remote control via LAN and FieldFox programming

FieldFox’s can be controlled using SCPI over LAN and USB.

USB keyboard and mouse Support

FieldFox supports use of USB keyboards and mice to simplify the input of text such

as file names while working in the field.


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