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Ten-Tec
Tuner
238B
Ten-Tec 238B User Manual
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The model
238A and the mo
del 238B
tuners are
Identical e
xcept for color.
2
Table of Contents
Table of Contents
3
List of Illustrations
4
Specifications
5
Installation
6
Introduction
6
Unpacking
6
Ground Connection
6
Meter Lighting
8
Front Panel
8
Rear Panel
8
Operating Instructions
9
Front Panel Control Functions
9
Capacitor
9
SWR Set
9
Antenna
10
Power SWR Meter
10
Operating Hints
10
Antenna Systems Matching Theory
11
The Antenna
11
The Transmission Line
12
Effect of the Transmission Line on Antenna Impedance
13
Standing Wave Ratio
14
Overall Summary
14
Alignment and Calibration
15
SWR Bridge
15
Wattmeter Calibration
15
Illustrations and Circuit Schematics
16
Circuit Description
16
Schematic Diagram
17
Tuner Configurations
18
Tuner Configuration Diagrams
18
Bottom Copper
19
Top Silk Screen
19
Top Copper
19
Master Parts List
20
Final Assembly Parts List
20
PC Board Parts List
20
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Ten-Tec 238B Specifications
General
Type
Antenna Tuner
Frequency Range
1.8 - 30 MHz
Tuning Method
Manual
Connectors
SO-239
Power Handling PEP
300 W
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