Bird Technologies 8000 Series - Manual (Page 15)

Chapter 3
Installation
General
These loads may be used for portable operation or fixed in-
stallation. The Models 8080, 8085 and 8164 are, in general,
light enough to be attached directly to the mating RF con-
nector of another device such as a Bird Thruline Wattmeter
or simply set on the workbench like the Models 8166, 8173,
and 8431. Attach the load resistor as close as possible to the
transmitter’s output and use only suitable connectors. Try
to connect direct to minimize cable length and avoid the use
of adapters as much as possible. The Model 8166, because of
its weight, has a provision for special mounting. The hous-
ing has four tapped mounting holes on one side. They are
1/2 inch (13 mm) deep for 8-32 screws and arranged in a
6-3/8 x 1-3/4 inch (162 x 44.4 mm) rectangle. The Model
8431, mounted horizontally, will dissipate up to 500 Watts,
and mounted vertically, up to 600 Watts. Model 8173 should
be operated only in a horizontal position.
The Model 8163 Termaline Load Resistor is identical to the
Model 8164 load electrically and physically except for
mounting holes. The Model 8163 load resistor has four
mounting holes with Heli-Coil stainless steel inserts to ac-
commodate 8-32 mounting screws. These mounting holes
are located two on the lower front face of the unit and two
on the lower rear face.
Mounting
Location
Allow at least six inches of clearance around these units to
permit an unimpeded access of natural convection of air for
adequate heat dissipation. Place the loads to permit the
shortest possible cable length between the unit and the
transmitting equipment.
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