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MFJ IntelliTuner -991 Instruction Manual

Automatic antenna tuner
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IntelliTuner
TM
Automatic Antenna Tuner
Model MFJ-991
INSTRUCTION MANUAL
CAUTION: Read All Instructions Before Operating Equipment
MFJ ENTERPRISES, INC.
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-5869 Fax: 662-323-6551
C
COPYRIGHT
2004 MFJ ENTERPRISES, INC.
VERSION 1B

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Summary of Contents for MFJ IntelliTuner MFJ-991

  • Page 1 IntelliTuner Automatic Antenna Tuner Model MFJ-991 INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment MFJ ENTERPRISES, INC. 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 COPYRIGHT 2004 MFJ ENTERPRISES, INC. VERSION 1B...

  • Page 3: Table Of Contents

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Contents THE BASICS Introduction............................1 Features............................2 Specifications........................... 2 Fast Start ............................3 Front Panel............................4 SWR/Wattmeter........................4 C-UP and C-DN Buttons ....................4 L-UP and L-DN Buttons..................... 4 AUTO Button ........................4 TUNE Button........................
  • Page 4 Figure 1. Installation Block Diagram....................3 Figure 2. MFJ-991 Front Panel....................... 4 Figure 3. Button Action ........................5 Figure 4. MFJ-991 Back Panel ....................... 6 Figure 5. Alinco Interface Cable..................... 7 Figure 6. Icom Interface Cable ....................... 7 Figure 7. SWR/Wattmeter ......................8 Figure 8.

  • Page 5: The Basics

    If so, tuning is instantaneous and you’re ready to operate. If not, MFJ’s IntelliTune algorithm (based on MFJ’s famous SWR Analyzer technology) kicks in. It measures the complex impedance of your antenna.

  • Page 6: Features

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Features • Automatically matches antennas from 6 to 3200 ohms impedance • Handles 150 watts PEP SSB/100 watts CW • Tune in less than 15 seconds, usually less than 5 seconds • Over 1000 non-volatile memories for tuner settings •...

  • Page 7: Fast Start

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Fast Start WARNINGS ● Never operate the tuner with its cover removed. Contact with the components inside the tuner while transmitting will result in painful RF burns. ● Locate the tuner so that the rear terminals are not accessible during operation. The single wire connection may have high voltage while transmitting.

  • Page 8: Front Panel

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Front Panel C-UP L-UP AUTO POWER 3.0 2.0 MFJ IntelliTuner C-DN L-DN TUNE Hi x1 Lo x.1 400-3083 AUTOMATIC ANTENNA TUNER BYPASS 300 / 30 150 Watts PEP SSB / 100 Watts CW...

  • Page 9: Tune Button

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Press and hold [TUNE] for 0.5 to 2 seconds to start the automatic tuning process. The transmitter must be keyed first with at least five watts of power. When the SWR is already below the target SWR, pressing [TUNE] will fine-tune the match for a lower SWR, if possible.

  • Page 10: Back Panel

    A female DB-9 connector for connecting to the MFJ-993RC Remote Control, Remote Port: allowing remote operation of the tuner. The MFJ-993RC duplicates all the front panel buttons except [POWER]. In addition, there are two LEDs on the remote control. The red Tuning LED lights to indicate tuning is in progress and the green SWR LED lights when the SWR is below the target SWR.

  • Page 11: Transmitter

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual cable provides power and control between an Alinco radio and the MFJ automatic tuner. Supported Alinco radios are DX-70, DX-77, and any Alinco radio that supports the Alinco EDX-2 tuner. Pin 1 (Ground) connects to the Sleeves of both 3.5 mm Stereo Phone Plug and Power Plug.

  • Page 12: Installation

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Installation WARNING ● Never operate the tuner with its cover removed. Contact with the components inside the tuner while transmitting will result in painful RF burns. ● Locate the tuner so that the rear terminals are not accessible during operation. The single wire connection may have high voltage while transmitting.

  • Page 13: Setup

    12 for more details. Setup You can set up how the MFJ-991 tuner works and behaves. In addition to displaying power and SWR, the meter also indicates tuner status when you make setup changes. The meter needles bounce, or rise to one point and stay, to provide information.

  • Page 14: Meter Range

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Meter Range You can select a meter scale range or use auto range. In the 30 watts (low) range, the forward full scale is 30 watts and the reflected full scale is 6 watts (divide the meter reading by 10). In the 300 watts (high) range, the forward full scale is 300 watts and the reflected full scale is 60 watts.

  • Page 15: Component Limit

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Component Limit The upper limits of inductance (L) and capacitance (C) are factory-limited according to frequency and maximum power rating; i.e., higher frequencies need less inductance and less capacitance when the L- network is properly tuned. Pressing [C-UP] and/or [L-UP] allows capacitance and inductance to be increased only to these limits.

  • Page 16: Tuner Status Indicators

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Tuner Status Indicators If not enough power is applied for tuning (less than 5 watts), the Forward Power needle will bounce to the 100-watt mark. When input power is too high, the tuner enters a self-protection mode and the Forward Power meter needle bounces to 300-watt mark (full scale).

  • Page 17: Grounding Hints

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Grounding Hints To minimize RFI, single wire feedlines (such as used with Windom or longwire antennas) should be kept away from other wiring. Radiation will be minimized if the single wire feeder runs parallel and reasonably close to the wire that connects the tuner to the outdoor ground.
  • Page 18 MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual wavelength feedline converts the low antenna impedance to a very high impedance at the tuner. A similar problem occurs if the antenna has an extremely high impedance and the transmission line is a multiple of a half-wavelength.

  • Page 19: Appendices

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual Appendices POWER-ON OPERATIONS (Press and hold buttons while turning on the power.) Press and hold to get the firmware version number. C-UP POWER Press and hold L-UP POWER to start the self test.

  • Page 20: Delete Antenna Memory

    30 seconds. This test also can be used to test the MFJ-993RC Remote Control. Make sure to lock in the [AUTO] button on the tuner before starting the self-test, and press the buttons on the MFJ-993RC instead of the front-panel buttons when prompted.

  • Page 21: Power Down Circuit Test

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual 5. The test begins by the forward needle of the meter going up slowly to full scale and then drops to zero, followed by the reflected needle going up slowly to full scale and then dropping to zero. This tests the meter.

  • Page 22: Relay Test

    To calibrate the wattmeter, you will need a Phillips screwdriver and a tuning tool or small flat blade screwdriver. WARNING: Never operate the MFJ-991 with its cover removed; dangerous voltages and currents can be present during operation. Never exceed tuner specifications.

  • Page 23: Swr Bridge Calibration

    WARNING: Do not touch anything inside the tuner during operation! Serious, painful RF burns can result. WARNING: Never operate the MFJ-991 with its cover removed; dangerous voltages and currents can be present during operation. Never exceed tuner specifications. Note: The trimmers involved in this calibration are located on the main circuit board in front of the TRANSMITTER connector;...

  • Page 24: Frequency Counter Calibration

    WARNING: Do not touch anything inside the tuner during operation! Serious, painful RF burns can result. WARNING: Never operate the MFJ-991 with its cover removed; dangerous voltages and currents can be present during operation. Never exceed tuner specifications. 1. Turn off the power to the tuner and the transmitter.

  • Page 25: Technical Assistance

    If you have any problem with this unit first check the appropriate section of this manual. If the manual does not reference your problem or your problem is not solved by reading the manual, you may call MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869. You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask.

  • Page 26: Circuit Block Diagram

    MFJ-991 IntelliTuner Automatic Antenna Tuner Instruction Manual © 2004 MFJ Enterprises, Inc.
  • Page 27 MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.
  • Page 28 MFJ ENTERPRISES, INC. MFJ-991 Manual 300 Industrial Park Road Version 1B Starkville, MS 39759 Printed In U.S.A. 03/2004...

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