1
Chapter 1
Introduction
This publication refers to the Termaline Load Resistor models 8201 and 8203.
The differences between the models are listed in the specifications. Both
models will generally be referred to as a load throughout this manual.
Purpose and Function
These loads are portable, general purpose 50 ohm coaxial transmission line
terminations. They are self-contained units requiring no outside power source
or additional equipment. The Model 8201 load provides an accurate,
dependable, and practically non-reflective termination for testing and adjusting
transmitters under non-radiating conditions from DC to 2500 MHz and the
Model 8203 from DC to 1000 MHz.
Some examples of the uses of these loads are:
As a substitute antenna.
For tuning RF transmitters - under non-radiating conditions.
For making routine tests and adjustments.
As a substitute for any 50 ohm circuit loading element.
To measure, with a suitable indicating device, the power output of any
coaxially transmitted RF signal within its rating.
Description
These models are rectangular in shape with transverse fins encasing an oil-
dielectric-filled coolant cylinder. A retractable handle is recessed in the radiator
fins. Extra thick fins at the front and rear are bent 90° to form bottom mounting
flanges. These flanges are supports for free standing use or brackets for fixed
mounting. Flange holes are provided for this purpose.
Performance and Capabilities
The Model 8201 Termaline Load Resistor can absorb and dissipate up to 500 W
of RF power continuously over a frequency range of DC to 2500 MHz. It will
show a maximum VSWR of 1.1 to 1.0 from DC to 1000 MHz and 1.25 to 1.0 from
1000 to 2500 MHz.
