Bird Technologies 8833-300 - Manual (Page 5)

Introduction
1.1 Purpose and Function
The Model 8833-300 Termaline Load Resistor is
designed as a low reflection and nonradiating termi-
nation for coaxial transmission lines. It is a useful aid
in the tuning and troubleshooting of transmission
equipment within its rating.
1.2 Description
The Model 8833-300 RF Load is fully self-contained.
No additional equipment or outside power source is
required. Attached to the front and rear panels of the
rhombic-shaped radiator are mounting flanges.
These flanges act as supports for free standing use
in portable applications, or as mounting brackets for
optional fixed installation. There are mounting slots
provided in the flanges for this purpose, see Section
2 - Installation. Convenient carrying tabs are also
provided at each end of the radiator.
1.3 RF Input
The RF input connection is on the lower front face
of the unit. The Model 8833-300 is designed for use
with coaxial cable using large LC or LT connectors.
A female LC connector is installed at the factory, a
female N connector is also supplied. Bird Quick-
Change “QC” connectors, and how to change them,
are described in Section 5 - Maintenance.
1.4 Coolant
The load unit is filled with a specially selected dielec-
tric coolant chosen for its desirable thermal charac-
teristics and dielectric properties.
1.5 Vent
The coolant inlet, when capped with the vent plug,
relieves internal pressure resulting from expansion of
heated coolant.
1.6 Items Supplied
Model 8833-300 RF Load Resistor
Female LC Connector (installed)
Female N Connector
Shipping Plug with O-Ring Seal (installed)
Vent Plug with O-Ring Seal (attached by chain)
Coolant (installed)
Interlock Thermoswitch (optional)
1.7 Specifications
Refer to Table-1 for operational specifications.
Power Rating 1000 W continuous duty
RF Input Impedance 50 ohm
Input Connector Bird “QC” type, female LC normally supplied installed. Female N supplied as an
accessory.
Frequency Range DC - 2.5 GHz
VSWR
dc-1 GHz
1-2.5 GHz
1.10:1.0
1.25:1.0
Ambient Temperature -40°C to +45°C (-40°F to +113°F)
Dimensions 21-45/64"L x 7-1/8"W x 17-3/16"H (551 x 181 x 437 mm)
Weight 54 lb 10 oz (24.8 kg)
Finish Light navy gray (MIL-E-15090C)
Cooling Method Liquid dielectric and natural air convection
Table - 1
Specifications
RF Load Resistor Model 8833-300
Page 5