MFJ -993BRT Instruction Manual
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MFJ -993BRT Instruction Manual

300 watt intellituner remote automatic antenna tuner
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300 Watt IntelliTuner
TM
Tuner
Remote Automatic Antenna
MFJ-993BRT
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
Version 1A
© 2011 MFJ Enterprises, Inc.

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Summary of Contents for MFJ MFJ-993BRT

  • Page 1 300 Watt IntelliTuner Tuner Remote Automatic Antenna MFJ-993BRT 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 Version 1A © 2011 MFJ Enterprises, Inc.
  • Page 2 MFJ-993BRT Legal Limit IntelliTuner Automatic Remote Antenna Tuner Instruction Manual DISCLAIMER Information in this manual is designed for user purposes only and is not intended to supersede information contained in customer regulations, technical manuals/documents, positional handbooks, or other official publications. The copy of this manual provided to the customer will not be updated to reflect current data.

  • Page 3: Table Of Contents

    MFJ-993BRT Legal Limit IntelliTuner Automatic Remote Antenna Tuner Instruction Manual Table of Contents THE BASICS ........................1 Introduction .................................1 Features..................................2 Specifications................................2 INSTALLATION ......................3 OPERATION........................5 Tuning Resolution ..............................6 Transceiver Foldback Circuit ............................6 Grounding Hints ................................7 Antenna System Hints ..............................7 Location ..................................7...
  • Page 4 MFJ-993BRT Legal Limit IntelliTuner Automatic Remote Antenna Tuner Instruction Manual NOTES © 2011 MFJ Enterprises, Inc MFJ-993BRT Version 1A...

  • Page 5: The Basics

    The MFJ-993BRT lets you rapidly tune almost any unbalanced or single-wire antenna automatically. Balanced feedlines may be used with an MFJ-912 1.5 kW 4:1 balun connected to the MFJ-993BRT antenna output. MFJ's exclusive InstantRecall...

  • Page 6: Features

    90-foot or longer antenna on 160 meters 25-foot or longer antenna on 80-meters 8-foot or longer antenna on 40-10 meters. Note: The optional MFJ-2904 external inductor extends the MFJ-993BRT tuning range to 160 meters for popular 43-foot verticals. • SWR matching range: up to 4:1 for < 50 ohms and up to 32:1 for > 50 ohms •...

  • Page 7: Installation

    Water may accumulate and seep into the tuner. 3. Connect the tuner to the transceiver, the amplifier, the MFJ-4117 Bias Tee (note the orientation of the Bias TEE) and the antenna with 50-ohm coaxial cables capable of handling the RF power levels expected.
  • Page 8 6. If a Lightning Surge Suppressor is used in line with the feed line to the tuner make sure it is the type that will pass DC such as the MFJ-272 as DC power is supplied through the feed line.

  • Page 9: Operation

    Instruction Manual Operation 1. Turn on the MFJ-993BRT power via the MFJ-4117 Bias TEE. With power off the Tuner is in Bypass mode. With power on the MFJ-998 wakes up in bypass mode until RF is supplied to the tuner.

  • Page 10: Tuning Resolution

    MFJ-993BRT 300 Watt IntelliTuner Automatic Remote Antenna Tuner Instruction Manual Tuning Resolution Meter Frequency Range (MHz) Memory Resolution 1.800-2.000 75/80 3.500-4.000 5.3305, 5.3465, 5.3665, 5.3715, and 5.4035 5 memory locations 7.000-7.300 10.100-10.150 14.000-14.350 18.068-18.168 21.000-21.450 24.890-24.990 28.000-29.700 Figure 8 Tuning Window Resolution Chart The memory resolution for non-amateur frequency bands between 160 and 10 meters is approximately 0.2 percent of the lower frequency of each band.

  • Page 11: Grounding Hints

    A good earth ground and RF ground should always be connected to the case of the MFJ-993BRT. A wing-nut post marked GROUND is provided for ground connections. For safety, please use good DC and RF grounds.
  • Page 12 MFJ-993BRT 300 Watt IntelliTuner Automatic Remote Antenna Tuner Instruction Manual The following suggestions will reduce the difficulty in matching an antenna with a tuner: • Never center feed a half-wave multi-band antenna with a high impedance feedline that is close to an odd multiple of a quarter-wave long.

  • Page 13: Appendices

    3. Release the buttons after 2 or 3 seconds. 4. Resume with normal operation. Note: Resetting to factory defaults does not erase the antenna memories. Note: If the MFJ-993BRT is not behaving properly or acting erratic, try resetting the tuner to factory defaults. Total Reset To erase both antenna memories and reset to factory defaults, press and hold down the [TUNE], [C-UP] and [L-UP] buttons while turning the power on.

  • Page 14: Delete Entire Antenna Memory

    MFJ-5409: 6 feet long RS-232 cable, female DB-9 to male DB9 connector • MFJ-5803: 3 feet long RG-58 A/U 50-ohm coax cable with a PL-259 connector on each end • MFJ-5806: 6 feet long RG-58 A/U 50-ohm coax cable with a PL-259 connector on each end •...

  • Page 15: Full 12-Month Warranty

    MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have the discretion to deny warranty without dated proof-of- purchase.
  • Page 16 MFJ-993BRT Manual Version 1A Printed In U.S.A. 10/2011 MFJ ENTERPRISES, INC 300 Industrial Park Road Starkville, MS 39759...

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