Water-Cooled
20 kW RF Loads

The 8740 Series RF loads are compact, non-radiating solutions built for continuous RF power dissipation in high-power transmitter and transmission line systems. Designed for environments where thermal control and space efficiency tare critical, these loads convert RF energy directly into heat through a hollow resistive film element, with the heat efficiently absorbed by internal water flow.

With broadband, low-VSWR performance and virtually no ambient heat generation, the 8740 Series can be installed in any position—even in tight or thermally sensitive spaces. Operation requires up to 8 gallons (30.4 liters) per minute of potable water, making it ideal for long-duration, high-power applications where aggressive heat removal is essential.

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Why Choose 8740 Series?

High-Power RF Dissipation

Handles up to 20 kW of continuous RF power with low VSWR for accurate, stable performance.

Efficient Thermal Transfer

Direct water cooling rapidly removes heat, enabling long-duration operation without performance drift.

Space-Saving Versatility

Compact footprint and flexible orientation simplify installation in tight or unconventional setups.

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Find the right RF load for your application—side-by-side technical specs across Bird’s trusted solutions.

Model Number

8745 request_button

1 kHz to 900 MHz @ 1.10 max (DC for continuity checks)

3-1/8 EIA, Flanged

{id=3, name='Water', order=2, label='Water'}

19.5 in L x 3.5 in dia
(495 mm x 90 mm)

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8746 request_button

1 kHz to 900 MHz @ 1.10 max (DC for continuity checks)

3-1/8 EIA, Unflanged

{id=3, name='Water', order=2, label='Water'}

19.5 in L x 3.5 in dia
(495 mm x 90 mm)

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Why RF Experts Choose Bird

For over 80 years, RF professionals have trusted Bird loads to deliver unmatched stability, low VSWR, and rugged reliability—whether on the bench or in the field.

These aren’t just dummy loads—they’re peace of mind for your entire system.

Water-Cooled 20 kW RF Loads