Bird Technologies 8327-300 - Manual (Page 11)

Chapter 1
Introduction
This publication refers to the Tenuline Attenuator Model 8327-300. This chapter
contains introductory information including product specifications; items supplied;
and accessory items available.
Purpose and
Function
The Model 8727-300 Attenuator is a low-refection resistance network for application
in reducing RF power by known and controlled amounts. The radiator has rhombic
shaped cooling fins spaced evenly along its length for the most efficient cooling. This
attenuator is useful for lowering a high input RF power to a level suitable for feeding
into an oscilloscope, frequency counter or similar device. The attenuator is designed
to match the most commonly used 50 ohm transmission line systems.
Description A system of resistive film-on-ceramic cylindrical resistors immersed in a dielectric
coolant constitutes the RF section assembly. By convection, the coolant carries the
heat generated in the various resistor elements to the walls of the coolant housing.
The housing is encased in a set of radiating fins which are attached to its outer
surface. The radiating fin surfaces dissipate the heat of the coolant into the sur-
rounding air.
The unit may be used for isolation of power sources up to 1000 W and for low level
monitoring. The low power value obtained at the output of the attenuator can easily
be read on an oscilloscope or terminated in a small RF load resistor.
This attenuator does not require any external source of power or utilities for cooling
purposes. It is a self-contained instrument intended to be fully cooled by natural
convection in normal ambient air with a power input of 1000 W. The front and rear
panels of the unit have mounting flanges. These flanges act as supports for optional
fixed mount. Mounting holes are provided for this purpose. Mounting of this unit is
described in Chapter 3 - Installation.
Items Supplied The following items are supplied with the Model 8327-300
s LC Female connector - input end
s N Female connector - output end
s Instruction Manual
Items Required The following items are required to put the Model 8327-300 into service.
s Multimeter
s Screwdrivers
s Matching connectors on the coaxial transmission line
Optional Items The following items are available as optional equipment.
s Overload thermoswitch, P/N 2450-056 for protection against burnout.
s Quick-Change connectors for convenient and easy interchange with other “AN”
type “QC” connectors. Refer to the list in the Maintenance Chapter.
1