Bird 8860 – Oil Cooled RF Termination (1.5kW)

Bird 8860 RF Loads are self-contained high-power 50-ohm coaxial transmission line RF terminations requiring no outside power source or additional equipment. They provide accurate, dependable, and practically non-reflective termination for testing and adjusting transmitters under non-radiating conditions.

Up to 1500 watts of RF power can be dissipated.

Only model 8860 can be used with Bird QC Quick Connect connectors.

Bird 8860 Loads consist of a thin-film-on-ceramic resistor immersed in a dielectric coolant. The resistor, individually selected for its accuracy, is enclosed in a special housing. When surrounded by the coolant, this produces a uniform, practically reflectionless line termination over the specified frequencies.

The load is cooled by natural fluid and air convection currents. The coolant, chosen for its dielectric and thermal characteristics, carries heat from the resistor to the walls of the cooling tank, where radiator fins surrounding the tank transfer the heat to the air.

When the coolant is heated, thermal expansion causes an increase in internal pressure. The vent plug relieves this pressure while protecting the opening from dirt or other contaminants.

Bird offers several models of oil-cooled loads. Models are available with power ratings from 150W to 10kW, many connection options, and utilizing convection or blowers for cooling.

For more detailed information on Bird oil-cooled loads with power ratings, connector types, and more, please see pages 88-89 (PDF pages 9-10) of the document linked here.