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Chapter 1
Introduction
The Model 8745/46 Termaline Load Resistor is designed as a compact, low-
reflection, and non-radiating termination for RF transmission lines. Cooled by
internal water flow, it generates almost no surface heat, making installation
space minimal and convenient. The load can safely dissipate up to 20 kilowatts
of continuous power when used in a 50 ohm coaxial transmission line system.
Purpose and Function
Each model uses a 3-1/8 inch connector (refer to the Specifications for individ-
ual models) and will maintain a VSWR of less than 1.1 to 1.0 from 1000 Hz up
to 900 MHz. This load is intended for us-e on CW, AM, FM, SSB, and TV mod-
ulation envelopes, and within certain limitation on radar or pulse modes.
Information on applications involving pulse-type signals should be obtained
directly from Bird Electronic Corporation.
The Model 8745 and 8746 equipment consists of:
z
Load resistor
z
Instruction Manual
Note:
Refer to Figure 1 on page 10 for identification of the load.
Optional Equipment
An accessory protective Control System is available as optional equipment.
When properly installed, this system protects the load by shutting off the RF
power when water flow is too low or interrupted. Discussions of the flow con-
trol pertaining to Installation and Maintenance should be ignored when not
applicable. The Models 8745 and 8746 Termaline Load Resistor has the fea-
ture of field replacement of the resistor, described in Chapter 5, Maintenance.
Direct Power Measurement
When used in conjunction with a Bird Model 4600A or 4805A Thruline Watt-
meter, these load resistors may be used for direct reading power measure-
ments up to 20 kilowatts.
Summary of Contents for TERMALINE 8745 Series
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