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Table of Contents
Related Manuals for MFJ Legal Limit IntelliTuner MFJ-998RT
Summary of Contents for MFJ Legal Limit IntelliTuner MFJ-998RT
- Page 1 Legal Limit IntelliTuner Tuner Remote Automatic Antenna MFJ-998RT 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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Page 2: Table Of Contents
Memory Menu IntelliTune Menu SWR Beep Menu Beep Menu Refresh Menu Radio Interface Menu LC Limit Menu Setup Operation Manual Tuning Morse Code and Beeps Transceiver Foldback Circuit Grounding Hints Antenna System Hints © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... - Page 3 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. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
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Page 4: 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 5: Features
Dimensions (approx.): 13 ¾ × 6 ¼ × 18 in. (350 × 159 × 457 mm) (width/height/depth) including connectors • Weight (approx.): 9 lb. 8 oz. (4.3 kg) • Operating Temperature -40 to +160 degrees F † Specifications and design are subject to change without notice. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... -
Page 6: Fast Start
Never exceed tuner specifications. • Do not transmit with a high SWR for extended periods of time. Connect the MFJ-998RT to the transceiver, the amplifier, and the antenna as shown in Figure 1 and per the following directions: Figure 1 Basic Setup 1. -
Page 7: Installation
Water may accumulate and seep into the tuner. If mounted with the connectors toward the bottom then take the cover off and place it with the MFJ logo upright so any water that may get into the tuner will have a chance of draining out at the bottom of the cover. -
Page 8: Operation
Note: When attempting to tune the Tuner will not tune and go into bypass when the forward power exceeds 75 watts and the SWR is greater than 3.0, or when the forward power exceeds 125 watts while tuning regardless of the SWR. See “Morse Code and Beeps” Page 16 © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... -
Page 9: Internal Controls
The internal control panel is used for testing and specialized setup and is not available for normal operation of the MFJ-998RT. The analog meter is not included in the remote tuner. The other functions are available only when the cover is removed for testing. - Page 10 Do not be alarmed. • POWER Button: Used to turn the power on and off. The MFJ-998RT should normally be left in the ON position and switched remotely. When the power is off, the tuner is placed in bypass mode, When turning on the power, the tuner powers up in the bypass mode and displays the target SWR on the main screen.
- Page 11 MFJ-998RT Legal Limit IntelliTuner Automatic Remote Antenna Tuner Instruction Manual Figure 2 Mode Button Flow Chart © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
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Page 12: The Menus
These instructions are for setup and testing and the functions are not available for normal operation of the MFJ-998RT. When accessing these settings and controls do not touch any of the components other than the switches because of the chance of high RF voltages when tuning. Do not leave the cover off for normal operation. -
Page 13: L-Network Menu
Auto/Semi: A small “S” appears to indicate semi-automatic mode (29); nothing appears to indicate automatic mode. • StickyTune: When StickyTune is ON, a bar appears on top of the Auto/Semi indicator (30). © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... - Page 14 MFJ-998RT Legal Limit IntelliTuner Automatic Remote Antenna Tuner Instruction Manual Figure 6 LCD Display © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
- Page 15 MFJ-998RT Legal Limit IntelliTuner Automatic Remote Antenna Tuner Instruction Manual Figure 7 Display Tuner Indicators Enlarged © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
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Page 16: Setup Mode Menus
When testing high RF voltages may be present. Do not leave the cover off for normal operation. The setup mode menus allow you to set up how the MFJ-998RT works and behaves. There are 13 setup mode menus arranged in a “wrap-around” structure. To access these setup menus, press and hold the [MODE] button for two seconds. -
Page 17: Intellitune Tm Menu
When the refresh function is ON, the display is updated while tuning is in progress. Because the display is not available for remote operation it is recommended that it is left off for quicker tuning. Default is OFF. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... -
Page 18: Radio Interface Menu
Pressing [C-DN] and [L-DN] simultaneously or pressing [TUNE] quickly places the tuner in bypass mode; i.e. zero inductance and zero capacitance. RF from the transmitter goes directly to the antenna with no © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... -
Page 19: Morse Code And Beeps
20 watts or less for tuning. At higher power levels, the reflected power occurred during tuning can damage your transceiver and causes component © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A... -
Page 20: Grounding Hints
For operator safety, a good outside earth ground or water pipe ground should always be installed and connected to the case of the MFJ-998RT. Make certain the safety ground also connects to the transmitter and other station accessories. A wing-nut post marked GROUND is provided for ground connections. For safety, please use good DC and RF grounds. - Page 21 The best way to operate 160 meters with an 80 or 40 meters antenna is to load either or both feedline wires (in parallel) as a longwire. The antenna will act like a “T” antenna worked against station ground. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
- Page 22 • SWR Beep Off • Beep On • Refresh Off • Radio Interface Off • Push Tune <0.5s To Bypass † These settings are stored separately for antenna banks 1 and 2. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
- Page 23 3. Release the buttons when DEFAULTS RESET appears on the display. 4. Resume with normal operation. Note: Resetting to factory defaults does not erase the antenna memories. Note: If the MFJ-998RT 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 24 7. If the power-down detection circuitry is okay, a repetitive message PASS will be displayed and sent as Morse code (di-dah-dah-dit di-dah di-di-dit di-di-dit). If there is a problem, message PD FAIL will be displayed and sent as Morse code repetitively. 8. Turn the power off. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
- Page 25 To calibrate the frequency counter, you will need a transmitter, a 50-ohm dummy load, two 50-ohm SO- 239 coax cables, a Phillips screwdriver, and a tuning tool or small flat blade screwdriver. © 2011 MFJ Enterprises, Inc MFJ-998RT Version 1A...
- Page 26 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 27 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 28 MFJ-998RT Manual Version 1A Printed In U.S.A. 09/2011 MFJ ENTERPRISES, INC 300 Industrial Park Road Starkville, MS 39759...