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Related Manuals for MFJ MFJ-926B
Summary of Contents for MFJ MFJ-926B
- Page 1 Model MFJ-926B INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment MFJ ENTERPRISES, INC. 300 Industrial Park Road Starkville, M S 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 C O P Y R IG H T 2 0 10 M FJ E N T E R P R IS E S , IN C .
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Page 2: Table Of Contents
MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual Contents THE BASICS Introduction ............................1 Features ............................2 Specifications ...........................2 Fast Start............................3 Internal Components ........................4 SWR LED ...........................4 TUNE LED .........................4 TUNE Button ........................4 Automatic/Semi-Automatic Tuning Mode.............4 ANT Button.........................5 POWER Button ........................5 Connections ............................5 Transmitter ..........................5... - Page 3 MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual SWR Bridge Calibration.........................15 In Case of Difficulty........................16 Technical Assistance ........................17 List of Accessories .........................17 Limited Warranty ...........................19 FIGURES Figure 1. Installation Block Diagram ....................3 Figure 2. Power-On Operations.....................11 TABLES Table 1. Memory Resolution......................7 Table 2.
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Page 4: The Basics
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), the MFJ-926B tuner settings are instantly restored and you’re ready to operate in milliseconds. -
Page 5: Features
MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual Features Automatically matches antennas from 6 to 1600 ohms impedance (SWR up to 32:1) • Handles 200 watts SSB/CW • Tune in less than 15 seconds, usually less than 5 seconds •... -
Page 6: 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 7: Internal Components
SWR is greater than 2:1. The MFJ-926B 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 8: Ant Button
MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual ANT Button: Used in conjunction with other buttons for changing functions in the MFJ-926B. • POWER Button: Used to turn the power on and off. When the power is off, the tuner is placed in •... -
Page 9: 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 10: Miscellaneous
L- network is properly tuned. These limits are built into the MFJ-926B 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 11: Morse Code And Flashes
MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual 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 as indicated on the green LED. Increasing the input power above two watts ends this message. -
Page 12: 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-926B. 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 13 MFJ-926B HF Automatic Remote 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.
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Page 14: Appendices
MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual Appendices POWER-ON OPERATIONS (Press and hold buttons while turning on the power.) Press and hold TUNE POWER to start the self test. Press and hold TUNE POWER to delete current antenna memory. -
Page 15: Delete Entire Antenna Memory
5. Flash three times and resume normal operation. Self Test A self-test routine will check the functions of the MFJ-926B. This routine checks the LEDs, the internal buttons, the internal memory, and the power-down circuitry. During the self-test, you may stop the test by turning off the unit;... -
Page 16: Power-Down Circuit Test
MFJ-926B HF Automatic Remote Antenna Tuner Instruction Manual 4. Release the [TUNE] button. The unit then checks for short circuits, power-down detection level, and wakeup circuitry. 5. Press [ANT] button and the green LED should blink once. 6. Press [TUNE] button and the green LED should blink once. -
Page 17: Relay Test
2. Remove the cover from the tuner (6 screws) with a Phillips screwdriver. 3. 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 18: Frequency Counter Calibration
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: List Of Accessories
List of Accessories MFJ-1312D: 12 VDC 500mA power supply • MFJ-4117: BiasTee DC power injector with on/off switch (included with the MFJ-926B) • MFJ-5803: 3 feet long RG-58 A/U 50-ohm coax cable with a PL-259 connector on each end •... - 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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