Bird Technologies 8320 - Manual (Page 11)

Chapter 1
Introduction
Purpose and
Function
The Series 8320 Tenuline Attenuator are low reflection re-
sistance networks for use in reducing RF power in 50 ohm
transmission lines by known and controlled amounts. They
are self-contained instruments that require no external
source of power or utility service. The radiators having cool-
ing fins spaced evenly along their lengths for efficient cool-
ing. These attenuators are useful for lowering a high input
RF power to a level suitable for feeding into a scope, fre-
quency counter or similar device.
Performance
Characteristic
s and
Capabilities
Relying only on ambient air currents, these attenuators will
safely absorb, and dissipate harmlessly as heat, up to their
maximum rated input power. Over the frequency range of
dc to 500 MHz, the power output will be reduced by 30 dB
(99.9 percent) ± 0.5 dB. Up to 500 MHz, the input VSWR
will not exceed 1.1 and the out put VSWR 1.15.
Dimensions
and Weight
The dimensions and weight of these attenuators are given
in the Specifications. The weights given are net weights.
Therefore, the shipping weights will be approximately 20
percent higher.
Power and
Utility
Requirements
These attenuators are passive devices that are self-con-
tained; therefore, do not need any external source of power
or utilities to function.
Environmenta
l
Requirements
Operate these attenuators in a dust and vibration free envi-
ronment. The ambient temperature range should remain be-
tween -40°C and +45°C (-40°F and 113°F) for proper
operation. Allow at least 6 inch (150 mm) of clearance
around the unit to permit an unimpeded access of convec-
tion air currents for adequate heat dissipation.
Items
Furnished
The Series 8320 Attenuators are equipped with a Bird
Quick-Change “QC” design connectors. Female N type con-
nectors are normally supplied for the input and output but
may be conveniently and easily interchanged with other AN
type “QC” connectors. This instruction book is the only other
item furnished as standard equipment.
Items
Required
The only other items required are two matching connectors
on the coaxial transmission line to which the load will be
connected.
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