1
Chapter 1
Introduction
Bird 889x loads are portable, 50 ohm, coaxial RF transmission line termina-
tions, designed for frequency ranges of DC – 2.4 GHz. 889xD loads are
designed for use in the UHF (470 – 860 MHz) band but are otherwise identi-
cal. They provide accurate, dependable, and low reflection line terminations.
Up to 2500 watts of RF power can be dissipated, 5000 watts if the optional
blower assembly is used.
The – 300 is the basic load. The – 315 and – 320 consist of a load with an
installed blower assembly 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 freestand-
ing 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 rug-
ged design minimizes maintenance requirements.
Items Supplied
z
Load Resistor: Pre-filled with coolant at the factory
z
Shipping Plug
z
Vent Plug
z
Instruction Manual
Items Required but not Supplied
z
Coupling Kit:
Connects the load to the RF line
Optional Accessories
z
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)
The blower and control thermoswitch are standard on the –315
and –320 loads.
z
Interlock Thermoswitch:
Automatically shuts off the transmitter to
prevent overheating of the load.
深圳市新朗普电子科技有限公司
www.xLp17.com Email:[email protected]
TEL:0755-83986300 FAX:0755-88850515
QQ：55178055 285480356
深圳市新朗普电子科技有限公司
www.xLp17.com Email:[email protected]
TEL:0755-83986300 FAX:0755-88850515
QQ：55178055 285480356
