Ten-Tec 238B - User Manual

The model 238A and the model 238B tuners are
Identical except for color.

Summary

Installation

1-3 Transmitter Connection

Guidance on connecting the transmitter's coaxial output to the tuner's input connector.

1-4 Ground Connection

Procedure for connecting the station ground system to the tuner's GND terminal.

1-5 Antenna Connections

Instructions for connecting various types of antenna feedlines to the tuner's terminals.

Operating Instructions

2-2 Front Panel Controls

2-3 Antenna Matching Procedure

Procedure to quickly match almost any antenna system using minimum transmitter power.

2-4 Antenna Selection

Safety Precautions and Cautions

Important safety warnings regarding high voltages, high RF currents, and switching under power.

Alignment and Calibration

2-8.1 SWR Bridge Alignment

Details the steps to adjust the SWR bridge for a null, including component references.

2-8.2 Wattmeter Calibration

Outlines the procedure to calibrate the built-in wattmeter using an external calibrated wattmeter.

Illustrations and Circuit Schematics

3-2 Circuit Description

3-3 Tuner Configurations

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