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Summary of Contents for MFJ IntelliTuner MFJ-994BRT
- Page 1 Model MFJ-994BRT 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 2010 MFJ ENTERPRISES, INC. VERSION 1A © 2011 MFJ Enterprises, Inc.
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Page 2: Table Of Contents
MFJ-994BRT HF Automatic Remote Antenna Tuner Instruction Manual Contents THE BASICS Introduction ............................1 Features ............................2 Specifications ........................... 2 Fast Start............................3 Internal components......................... 4 C-UP and C-DN Buttons ..................... 4 L-UP and L-DN Buttons ...................... 4 AUTO Button........................4 TUNE Button ........................ -
Page 3: The Basics
SWR tuning accuracy occurring at tuning power levels of 10-20 watts. Manual tuning is also available for “touching up” the tuning if desired. The MFJ-994B tuner enters a “sleep” mode when idle and when no transmit signal is present, turning off the microprocessor clock to avoid the generation of spurious signals. -
Page 4: Features
MFJ-994BRT HF Automatic Remote Antenna Tuner Instruction Manual Features • Automatically matches antennas from 12 to 800 ohms impedance • Handles 600 watts PEP SSB/600 watts CW/500 watts constant carrier • Tunes in less than 15 seconds, usually less than 5 seconds •... -
Page 5: Fast Start
Do not transmit with a high SWR for extended periods of time. ● 1. Connect the transmitter to the “RF IN/OUT” coaxial connector on the MFJ-4117 Bias-Tee using a 50-ohm coaxial cable. (See Figure 1) This is the RF signal input connector. -
Page 6: Internal Components
SWR is greater than 2:1. The MFJ-994BRT has been pre-set with default settings at the MFJ Factory. However, if you remove the unit from the box, you can change the default settings as well as verify proper operation of the unit. -
Page 7: Connections
Do not be alarmed. • ANT Button: Used in conjunction with other buttons for changing functions in the MFJ-994BRT. Note: When the tuner power is OFF, the tuner is in bypass mode and RF from the transmitter goes directly to the antenna with no matching. -
Page 8: Installation
RF burns if the terminal is touched when transmitting. Be sure to locate the tuner so this terminal cannot accidentally be contacted during operation. 2. Install the MFJ-4117 Bias-Tee between the transmitter and the antenna. Use a 50-ohm coaxial cable (such as RG-58) to connect the transmitter. See Figure 1. -
Page 9: Miscellaneous
L- network is properly tuned. These limits are built into the MFJ-994BRT to prevent matching of extreme load impedance outside the tuner’s specification, which may result in excess voltage and/or current across the tuner’s components. -
Page 10: Tuner Status Indicators
MFJ-994BRT HF Automatic Remote Antenna Tuner Instruction Manual Morse Code (Only available when the MFJ-994BRT cover is removed) If not enough power is applied for tuning (less than two watts); “QRO” (dah-dah-di-dah di-dah-dit dah- dah-dah) will be sent on CW. Increasing the input power above two watts ends this message. -
Page 11: 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-994BRT. 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. - Page 12 MFJ-994BRT HF Automatic Remote Antenna Tuner Instruction Manual similar problem occurs if the antenna has an extremely high impedance and the transmission line is a multiple of a half-wavelength. The half-wavelength line repeats the very high antenna impedance at the tuner.
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Page 13: Appendices
MFJ-994BRT HF Automatic Remote 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 L-UP POWER Press and hold to start the self test. -
Page 14: Total Reset
30 seconds. This test also can be used to test the MFJ-994RC 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-994RC instead of the front-panel buttons when prompted. -
Page 15: Power Down Circuit Test
MFJ-994BRT HF Automatic Remote Antenna Tuner Instruction Manual 7. The unit then tests its non-volatile memory. This will reset the unit to its factory default settings. 8. If the unit is okay, both meter needles will go to full scale. If there is a problem, the forward needle will bounce and the reflected needle mark will indicate the failure. -
Page 16: Frequency Counter Calibration
Do not touch anything inside the tuner during operation! Serious, painful RF burns can result. WARNING: Never operate the MFJ-994B 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 17: Swr Bridge Calibration
WARNING: Do not touch anything inside the tuner during operation! Serious, painful RF burns can result. WARNING: Never operate the MFJ-994B 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 18: 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 19: Block Diagram
MFJ-994BRT HF Automatic Remote Antenna Tuner Instruction Manual © 2011 MFJ Enterprises, Inc. - Page 20 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.
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