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Chapter 1
Introduction
Bird 8920 Series Semiconductor Loads are portable, 50 ohm, coaxial RF transmission line terminations. They are
designed for frequency ranges of DC – 28 MHz, specially calibrated for greater stability at 13.56 MHz. They provide
accurate, dependable, and low reflection line terminations. Up to 5000 watts of RF power can be dissipated.
The load has a coolant chamber surrounded by radiator fins. The front and rear fins form mounting flanges which
can be used as supports for freestanding use or as brackets for fixed mounting. A pair of vent plugs at the top of the
unit relieves internal pressure from coolant expansion. The load’s simple and rugged design minimizes maintenance
requirements.
Items Supplied
Load Resistor: Pre-filled with coolant at the factory
Two Shipping Plugs
Two Vent Plugs
Instruction Manual
Items Required but not Supplied
Coupling Kit: Connects the load to the RF line
Optional Accessories
Interlock Thermoswitch: Automatically shuts off the RF generator to prevent overheating of the load
Figure
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8920 Series Outline Drawing
