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MFJ IntelliTuner MFJ-993BRT, Instruction Manual

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MFJ IntelliTuner MFJ-993BRT Instruction Manual Download Page 2

MFJ-993BRT Legal Limit IntelliTuner

TM

  Automatic Remote Antenna Tuner                  Instruction Manual

 

 

© 2011 MFJ Enterprises, Inc                                                                                                                   ii 

 

MFJ-993BRT Version 1A 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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. 
 
Customers using this manual should report errors or omissions, recommendations for improvements, or other comments to: 
 

MFJ Enterprises, 

300 Industrial Park Road, 

Starkville, MS 39759. 

Phone: (662) 323-5869 

FAX: (662) 323-6551. 

Business hours: 

M-F 8:00 AM-4:30 PM CST. 

 

 

 
 

Summary of Contents for IntelliTuner MFJ-993BRT

Page 1: ...c Antenna Tuner 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: ...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 Customers using this manual should report errors or omissions recommendations for improvements or other comments to MFJ Enterprises 300 Industrial Park Road Starkville MS 39759 Phone 662 323 58...

Page 3: ... 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 Matching Problems 7 APPENDICES 9 Resetting the Tuner 9 Factory Defaults 9 Factory Default Reset 9 Total Reset 9 Delete Entire Antenna Memory 10 List of Accessories 10 FULL 12 MONTH WARRANTY 11 ...

Page 4: ...MFJ 993BRT Legal Limit IntelliTunerTM Automatic Remote Antenna Tuner Instruction Manual 2011 MFJ Enterprises Inc iv MFJ 993BRT Version 1A NOTES ...

Page 5: ...sign your own fixed matching network if desired Like all MFJ IntelliTuners TM the MFJ 993BRT learns and remembers When you transmit it automatically adjusts for minimum SWR and remembers the frequency and tuner settings safely stored in non volatile memory The next time you operate on that frequency or close to it and antenna these tuner settings are instantly restored and you re ready to operate ...

Page 6: ...ot 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 Minimum power for tuning 5 watts Maximum power while tuning 100 watts with foldback 20 watts without foldback RF power limit 300 watts PEP SSB 150 watts CW Frequency rang...

Page 7: ... such a way that it will not come in contact with people pets or shrubbery The Wire terminal will have high RF voltages on it in use These voltages can cause serious RF burns if the terminals are touched when transmitting 2 The tuner can be mounted vertical or with the plastic cover up Do not mount with the cover face down Water may accumulate and seep into the tuner 3 Connect the tuner to the tra...

Page 8: ...is the type that will pass DC such as the MFJ 272 as DC power is supplied through the feed line 7 Connect a 12 15V power supply to the DC input of the MFJ 4117 BIAS TEE to supply power to the tuner The station supply or an MFJ 1316 will work The supply needs to be capable of supplying 1 4A The use of a regulated supply is not mandatory but is recommended for best performance An optional 12 volts D...

Page 9: ...window then the tuner will retune as in the initial tuneup Note The MFJ 993BRT will sometimes not tune when changing bands This can occur if the MFJ 993BRT tuning solution for the previous band results in a very high SWR on the new band This very high SWR can reflect all input power from your transceiver The solution is to simply cycle power to the MFJ 993BRT when changing bands This drops the MFJ...

Page 10: ...ry default states To achieve this turn power off press and hold TUNE C UP and L UP buttons while turning on the power A TOTAL RESET message will appear Transceiver Foldback Circuit Any in line amplifier must ALWAYS be bypassed prior to tuning Modern transceivers with solid state finals usually have a foldback circuit to protect the final transistors from high SWR which can damage or destroy them A...

Page 11: ...les in the technical literature that can advise on how to properly ground the antenna system for both lightning and RF signals Antenna System Hints Location For the best performance an end fed wire antenna should be at least one quarter wavelength long at the operating frequency Horizontal dipole antennas should be at least a half wavelength long and located as high and clear as possible While goo...

Page 12: ...id problems a dipole antenna should be a full half wave on the lowest band On 160 meters an 80 or 40 meters antenna fed the normal way will be extremely reactive with only a few ohms of feedpoint resistance Trying to load an 80 meters half wave dipole or shorter antenna on 160 meters can be a disaster for both your signal and the tuner The best way to operate 160 meters with an 80 or 40 meters ant...

Page 13: ...meter Setup Menu Target SWR Inductance 0 µH Capacitance 0 pF Antenna 1 Tuning Mode Automatic Target SWR 1 5 Auto Tune SWR 0 5 above target SWR Amp Bypass SWR 2 0 Meter Range Auto range Peak Hold On Memory Bank 1A IntelliTune On SWR Beep Off Beep On Refresh Off Radio Interface Off Push Tune 0 5s To Bypass Sticky Tune On Factory Default Reset To reset the tuner to these defaults 1 Turn off the power...

Page 14: ...a memory or press the NO L DN button to cancel Release the button to resume normal operation List of Accessories MFJ 912 1 5 kW 4 1 balun MFJ 2904 160 Meter Tuning Range Extender for 43 foot Verticals MFJ 1316 12 VDC 1 5 amp power supply 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 ...

Page 15: ...or money order must be provided to cover postage and handling 4 This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling 662 323 5869 5 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 6 Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board produ...

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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