BIRD TERMALINE 8135, Инструкция

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Chapter 1
Introduction
Purpose and
Function
The Bird Model 8135 TERMALINE Load Resistor is a por-
table, general purpose 50 ohm coaxial transmission line ter-
mination. It is a self-contained unit requiring no outside
power source or additional equipment. This coaxial load re-
sistor provides an accurate, dependable, and practically
non-reflective termination for adjustment, standby, and
testing of transmitters under nonradiating conditions.
Performance
Characteristic
s and
Capabilities
The Model 8135 can absorb up to 150 watts continuously
and dissipate it harmlessly as heat over a frequency range
of dc to 4000 MHz. It is designed to show low reflectivity
throughout this range. The VSWR will be 1.1 to 1.0 maxi-
mum from dc to 1000 MHz, 1.2 to 1.0 maximum from 1000
to 2500 MHz and 1.3 to 1.0 maximum from 2000 to 4000
MHz.
Dimensions
and Weight
The Model 8135 is 8-13/16 inches long, 4 inches wide, and
6-7/16 inches high (224 x 102 x 164 mm). It has a weight of
6 lb (2.7 kg) net and a shipping weight of 8 lb (3.6 kg).
Power and
Utility
Requirements
Being a passive electronic device, the Model 8135 needs no
outside source or utility service.
Enviromental
Requirements
The Model 8135 should be used in a dust and vibration-free
environment. The ambient temperature range should be
kept between -40C and +45C (-40F and +113F) for proper
operation. Allow at least 6 inches of clearance around the
load to permit an unimpeded access of convection air cur-
rents to the load.
Items
Furnished
The RF input connector, located on the front face of the unit,
is a Female N. It is a special “Quick-Change” design permit-
ting rapid and easy interchange with other Bird AN type
“QC” connectors. This instruction book is the only other
item provided.
Items
Required
The only other item required is a matching connector on the
coaxial transmission line.
Tools and
Test
Equipment
Only simple tools like screwdrivers are needed to disassem-
ble the Model 8135. A resistance bridge or ohmmeter with
an accuracy of one percent or better at 50 ohms is useful for
checking the resistance value of the RF section assembly.
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