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Water-Cooled
20 kW RF Loads

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

 With broadband performance, low VSWR, and practically no heat transfer to the outer housing, the 8740 Series can be installed in any position, including tight or thermally sensitive spaces. Operation requires a potable water supply of up to 8 gallons (30.4 liters) per minute, making these loads well suited for long-duration, high-power applications where aggressive heat removal is essential. 

 

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Why Choose 8740 Series?

Compare Models

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

Model Number
Frequency Range and VSWR
Connector
Type
Dimensions
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1 kHz to 900 MHz @ 1.10 max (DC for continuity checks)
3-1/8 EIA, Flanged
Water
19.5 in L x 3.5 in dia
(495 mm x 90 mm)
1 kHz to 900 MHz @ 1.10 max (DC for continuity checks)
3-1/8 EIA, Unflanged
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.

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