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MFJ MFJ-989D User Manual

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INSTRUCTION MANUAL
CAUTION: Read All Instructions Before Operating Equipment
COPYRIGHT 2014 MFJ ENTERPRISES, INC.
C
Model MFJ-989D
VERSION 2A
MFJ ENTERPRISES, INC.
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-5869 Fax: 662-323-6551
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MFJ MFJ-989D Specifications

General IconGeneral
BrandMFJ
ModelMFJ-989D
CategoryTuner
LanguageEnglish

Summary

Disclaimer

Disclaimer

Legal disclaimer regarding manual information and updates.

Introduction to MFJ-989D

Circuit Overview

Details the five integrated station accessories: SWR/Wattmeter, Antenna Selector, Dummy Load, Tuner, and Balun.

MFJ-989D Specifications

Power Requirements

Explains the use of a 9V battery or 12VDC external source for meter operation.

Front Panel Layout and Controls

Key Front Panel Controls

Identifies and describes the function of front panel controls like tuning capacitors, inductor, and selectors.

Rear Panel Connections

Rear Panel Port Functions

Details the purpose and connection types for rear panel ports like Transmitter, Coax, Bal Line, and Meter Lamp.

Installation Guidelines

Installation Placement and Safety

Provides advice on tuner placement, cable connections, grounding, and safety warnings.

Operating the SWR/Wattmeter

Measuring Power and SWR

Guides users on how to read power scales and calculate SWR using the meter.

Antenna Selector Operation

Explains how the selector routes signals to different antenna outputs or the dummy load.

Dummy Load Operation

Dummy Load Uses

Details the two primary functions: normalizing transmitters and measuring power.

1:1 Balun Functionality

Describes the balun's construction and role in connecting balanced feedlines.

T-Network Theory

T-Network Configuration and Principles

Explains the T-network's design and the "C-high L-low" rule for tuning.

Step-By-Step Tuning Procedure

Tuning Preparation and Steps

Provides a detailed procedure for tuning the antenna for minimum SWR.

High-Power Amplifier Interaction

Amplifier Tuning and Safety

Discusses tuning with amplifiers and specific warnings for "BIG" amplifiers.

Tuner Operating Notes

Tuning Range and Logging

Covers tuning limitations, the C-high L-low rule, and the importance of logging settings.

Critical Operational Warnings

Summarizes essential safety warnings for operating the tuner safely.

Troubleshooting Common Issues

SWR, Arcing, and RFI Solutions

Addresses common problems like high SWR, arcing, RFI, and grounding.

Antenna System Hints

Offers advice on antenna location and managing high-impedance loads.

Correcting Matching Problems

Feedline and Dipole Strategies

Provides guidance on feedline adjustments and dipole feeding for better matching.

Factory Technical Assistance

Lists contact details for MFJ technical service and factory support.

Tuner Log Usage

Recording Tuner Settings

Explains the purpose and use of the tuner log chart for efficient setup.

Notes Section

Notes Section

Placeholder for user notes or additional remarks.

Full 12 Month Warranty

Warranty Terms and Service

Outlines the warranty period, terms, proof of purchase, and service procedures.

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