Bird Technologies 8072A Series - Manual (Page 9)

Chapter 1
Introduction
This instruction book is intended for use by operators and in-
stallers of the Model 8072A-1 and 8072A-2 load resistor.
Description
The Bird Model 8072A-1 and 8072A-2 Termaline Coaxial
Load Resistor is a dry (air dielectric), conduction cooled
(needs heat sink), type 50-ohm RF (Radio Frequency) line
termination. It is capable of dissipating 300 W of continuous
power when properly mounted to a suitable heat sink. The
load is designed for a reflection-free termination of a trans-
mission line and is efficient in any position. The Model
8072A-1 and 8072A-2 is normally supplied with an N-Type
Female connector.
Installation
Unpacking
and
Inspection
All packages are carefully inspected prior to shipment. If
package shows any sign of damage, promptly inspect the de-
vice. If any damage is visible, notify the shipping carrier and
Bird Electronic of the damage.
Retain the shipping materials for repackaging.
Connections A suitable heat sink is required. It must be of such capacity
that at 300 W of continuous input, the temperature on top of
the load body will not exceed 155°C (311°F). Use an alumi-
num plate of at least 800 sq. in. by 1/8 in. thick (5200cm ² x
3mm) or equivalent.
Attach the load to a suitable heat sink as follows:
1. Apply a thin film of heat transfer compound over
the entire mating surface.
+
NOTE: The film, when flattened, must not ex-
ceed a thickness of 0.001 inch.
2. Mount the load to the heat sink using six mount-
ing screws, preferably stainless steel, and of suit-
able length to include the 1-1/32 inch load body,
heat sink thickness, washer and nut.
1