Bird Technologies 8890-320 Series - Manual (Page 13)

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Chapter 1 Introduction
The Bird 8890 series loads are portable, 50 ohm, coaxial RF transmission line terminations, designed for frequency
ranges of DC – 2.4 GHz. The 8890 series D loads are designed for use in the UHF (470 – 860 MHz) band, otherwise
they are identical to the stanard series. These loads provide accurate and dependable low reflection line termina-
tions. Power is dissipated at a level of up to 2500 watts of RF, 5000 watts if the optional blower assembly is used.
The 8890 series –300 is the basic load. The –315 and –320 models consist of a load with an installed blower assem-
bly for 115 or 230 VAC lines, respectively.
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 vent plug at the top of the unit
relieves internal pressure from coolant expansion. The load’s simple and rugged design minimizes maintenance
requirements.
Items Supplied
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Load Resistor
Note: Pre-filled with coolant at the factory
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Shipping Plug
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Vent Plug
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Instruction Manual
Items Required but not Supplied
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Coupling Kit: Connects the load to the RF line
Optional Accessories
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Bird BA-310 Blower Assembly: Doubles the RF power capacity of the load. Includes control thermoswitch
and detachable 3-wire power cable (without male plug for 230 Vac cable)
Note: The blower and control thermoswitch are standard on the –315 and –320 loads.
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Interlock Thermoswitch: Automatically shuts off the transmitter to prevent overheating of the load.