Bird Technologies 8920 Series - Manual (Page 11)

1
Chapter 1 Introduction
Bird 8920 Series Loads are portable, 50 ohm, coaxial RF transmission line terminations, designed for frequency
ranges of DC – 1 GHz. Bird 8920D Series Loads are identical, except that they are designed for the UHF (470 – 860
MHz) band. 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 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
•
Load Resistor: Pre-filled with coolant at the factory
•
One Shipping Plug
•
One Vent Plug
•
Instruction Manual
Items Required but not Supplied
•
Coupling Kit: Connects the load to the RF line
Optional Accessories
•
Interlock Thermoswitch: Automatically shuts off the transmitter to prevent over-
heating of the load
Figure 1 Bird 8920 Series Outline Drawing
VENT PLUG
INTERLOCK
THERMOSWITCH
(OPTIONAL)
26-7/8”
(681mm)
28-1/4”
(718mm)
8-3/8”
(212mm)
DEPENDS ON
CONNECTOR
7”
(178mm)
9-1/8”
(241mm)
(4) MTG. HOLES
3/8” (10 mm)