Bird 43 vs 4480A

The Bird 43 defined RF power measurement for generations of radio technicians.

The Bird 4480A brings that same measurement philosophy to modern digitally modulated radio systems.

The Bird Model 43 remains one of the most recognized RF wattmeters ever built and continues to serve as a reliable tool for traditional RF power measurements.

However, many modern public safety, utility, military, and commercial radio systems now rely on digitally modulated signals that require additional measurement capabilities.

The Bird 4480A extends the trusted Thruline® measurement method into these modern environments by providing true average power measurements, VSWR, return loss, and element-free operation.

The table below compares the Model 43 and 4480A to help technicians select the right instrument for their measurement needs.

Model 43 vs. 4480A

Continuous Wave (CW)

Digital Signals (P25, DMR)

Limited

Elements Required

Yes

Accuracy

± 5% of full scale

± 4% of reading

Forward Power

Reflected Power

Power Parameters

Watts only

Watts or dBm

VSWR

Must calculate

Direct display

Return Loss

Must calculate

Direct display

Frequency Coverage

Depends on elements

2 MHz - 1 GHz

Data Logging

Yes

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Model 43 vs. 4480A FAQ

Is the Bird 43 still the best wattmeter for two-way radio?

The Bird 43 remains one of the most trusted RF wattmeters ever produced. For modern digital radio systems such as P25, DMR, and NXDN, Bird recommends the 4480A Digital Wattmeter because it accurately measures true average power on digitally modulated signals.

What replaces the Bird 43 wattmeter?

The Bird 4480A Digital Wattmeter is Bird's next-generation Thruline wattmeter. It maintains the simplicity and ruggedness of the Bird 43 while adding digital signal measurement, VSWR, return loss, data logging, and element-free operation.

Is the Bird 4480A the successor to the Bird 43?

The Bird 4480A is not a direct replacement, but it is Bird's modern evolution of the Thruline wattmeter concept for today's digital RF environments.

What replaces the Bird Model 43 for digital radio measurements?

For digitally modulated systems such as P25, DMR, NXDN, and TETRA, Bird recommends the 4480A Digital Wattmeter as the modern evolution of the Thruline® wattmeter platform.

What wattmeter is best for land mobile radio (LMR) maintenance?

Both the Model 43 and 4480A are used in LMR maintenance. The 43 remains a trusted standard, while the 4480A adds capabilities optimized for modern digital radio systems.

Can the 4480A measure VSWR and return loss?

Yes. The Bird 4480A measures forward power and reflected power and automatically calculates VSWR and return loss. These measurements help technicians identify antenna, transmission line, and system matching issues without requiring additional test equipment.