4431 Wattmeter

Power Measurement with Built-In Signal Sampling

The Bird Model 4431 is a portable, analog wattmeter based on the trusted Model 43—enhanced with an integrated RF signal sampling port. It provides average power measurement using Bird’s interchangeable plug-in elements, while also offering a low-power sampled output via a BNC connector.

This lets technicians monitor frequency, modulation, or harmonics using external equipment without disturbing the signal path. Ideal for lab work, tuning, and system verification.

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Why Choose the 4431?

Measure and Monitor

Read average RF power and monitor the live signal—simultaneously, from one instrument.

Adjustable Sample Output

Use the front-panel control to set RF sample strength for counters, analyzers, or scopes

Built on the Model 43

Same rugged build, analog display, and element compatibility—now with added signal visibility.

How It Works

The Model 4431 uses a directional coupler and analog meter movement to measure average forward or reflected power.

In addition, an internal RF probe taps the signal and routes a low-power sample to a BNC connector on the right side of the meter. The technician can adjust output level using the front-mounted control knob, making it easy to connect to and protect external test equipment.

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Monitor Live RF Without Interrupting the Signal Path

Connect directly to a spectrum analyzer, frequency counter, or oscilloscope

Safely observe frequency, modulation, or harmonics while measuring power

Use the front-panel knob to adjust sample level for test equipment input

4431 Model Specification

Model Number

4431 Buy Now

2 MHz to 1.2 GHz

5 kW max. 2 to 30 MHz
1 kW max. 30 to 1000 MHz

± 5% of full scale

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FAQs

What is the RF sample port on the 4431 used for?

Can I adjust the strength of the sampled signal?

Does the 4431 measure RF power like the Model 43?

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Need Calibration?

Bird Calibration Services

Keeping equipment calibrated is the number one way to ensure performance and longevity. A Bird Calibration means we fully test your equipment and adjust it as needed to ensure it’s meeting specs.

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A Legacy of Trust. A Future of Simplicity.

For decades, Bird’s element-based wattmeters have set the standard for accuracy, durability, and technician-trusted performance. That legacy continues—but so does the evolution.

Whether you prefer the familiar reliability of plug-in elements or you're exploring the ease of new generation RF power measurement, Bird is here to support your journey.

Our expanding lineup of RF power measurement tools offers options for every workflow—rooted in accuracy, built for what’s next.

Because in RF, confidence doesn’t come from guessing. It comes from Bird.

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