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MFJ-939I
Instruction Manual
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MFJ MFJ-939I Instruction Manual

MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
Contents
The Basics .....................................................................................................................................................................1
Introduction...........................................................................................................................................................1
Models ..................................................................................................................................................................2
Features .................................................................................................................................................................2
Specifications ........................................................................................................................................................2
Fast Start........................................................................................................................................................................3
Front Panel.....................................................................................................................................................................4
Automatic/Semi-Automatic Tuning Mode............................................................................................................5
Back Panel .....................................................................................................................................................................6
Installation .....................................................................................................................................................................7
General Tuner Setup and Cabling .........................................................................................................................8
Operation .......................................................................................................................................................................9
MFJ-939I Icom ..................................................................................................................................................9
Icom Radio Interface............................................................................................................................9
Connections.................................................................................................................................9
MFJ-939K Kenwood........................................................................................................................................11
Kenwood Radio Interface ..................................................................................................................11
Connections...............................................................................................................................11
MFJ-939Y Yaesu .............................................................................................................................................13
Yaesu Radio Interface MFJ-5114Y ...................................................................................................14
Connections...............................................................................................................................14
Connections for the FT-100 ......................................................................................................15
Connections for FT-450 ............................................................................................................15
Connections for FT-857 or FT-897 ...........................................................................................15
Connections for FT-950 ............................................................................................................16
MFJ-939Y3 FT-1000MP FT-2000 FT-9000.....................................................................................................18
Yaesu Radio Interface MFJ-5114Y3 .................................................................................................18
Connections...............................................................................................................................18
Connections for FT-1000MP series of radios............................................................................19
Connections for FT-2000 series of radios .................................................................................19
Connections for FTDX-9000 series of radios............................................................................20
MFJ-939Y4 FT-2000 ........................................................................................................................................21
Yaesu Radio Interface MFJ-5114Y4 .................................................................................................21
Connections for FT-2000 series of radios .................................................................................21
Modification For Use With Alinco .....................................................................................................................22
Alinco Radio Interface .......................................................................................................................22
Connections...............................................................................................................................22
Operation...................................................................................................................................22
Miscellaneous ..............................................................................................................................................................23
ANTENNA MEMORY ......................................................................................................................................23
INTELLITUNETM ALGORITHM ......................................................................................................................23
LC Limits ............................................................................................................................................................23
MORSE CODE AND BEEPS ............................................................................................................................24
TRANSCEIVER FOLDBACK...........................................................................................................................24
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
GROUNDING HINTS........................................................................................................................................25
ANTENNA SYSTEM HINTS............................................................................................................................25
Appendices ..................................................................................................................................................................27
Resetting the Tuner .............................................................................................................................................27
Self Test ..............................................................................................................................................................28
Power-Down Circuit Test ...................................................................................................................................29
Relay Test ...........................................................................................................................................................30
Frequency Counter Calibration ...........................................................................................................................30
SWR Bridge Calibration .....................................................................................................................................31
Jumper Settings ...................................................................................................................................................32
IN CASE OF DIFFICULTY ...............................................................................................................................33
TECHNICAL ASSISTANCE .............................................................................................................................33
LIST OF ACCESSORIES ..................................................................................................................................33
FULL 12-MONTH WARRANTY ..............................................................................................................................35
Figures
Figure 1 General Setup ...............................................................................................................................................3
Figure 2 MFJ-939 Front Panel....................................................................................................................................4
Figure 3 Button Action ...............................................................................................................................................5
Figure 4 MFJ-939 Back Panel. ...................................................................................................................................6
Figure 6 General Setup ...............................................................................................................................................8
Figure 7 Icom Interface Cable. ...................................................................................................................................9
Figure 8 Kenwood Interface Cable ...........................................................................................................................12
Figure 9 Yaesu Interface Cable (FT-100/-450/-857/-897/-950). ..............................................................................14
Figure 10 Yaesu Interface Cable (1000MP/2000/9000 series)...................................................................................19
Figure 11 Yaesu Interface Cable (FT-2000 series).....................................................................................................21
Figure 12 Alinco Interface Cable. ..............................................................................................................................22
Figure 13 Power-On Operations. ................................................................................................................................27
Figure 14 Block Diagram ...........................................................................................................................................34
Tables
Table 1 Icom...............................................................................................................................................................9
Table 2 Kenwood......................................................................................................................................................11
Table 3 Yaesu ...........................................................................................................................................................14
Table 4 Y3 Interface.................................................................................................................................................18
Table 5 Y4 Interface.................................................................................................................................................21
Table 6 Alinco ..........................................................................................................................................................22
Table 7 Memory Resolution .....................................................................................................................................23
Table 8 Tuner Beeps.................................................................................................................................................24
Table 9 Failure Messages. ........................................................................................................................................29
Table 10 Jumper JP1 Setting ......................................................................................................................................32
Table 11 Jumper JP2 Setting ......................................................................................................................................32
Table 12 Jumper JP4 Setting ......................................................................................................................................32
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
Notes:
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
THE BASICS
Introduction
The MFJ-939 Plug&Play IntellitunerTM a simple to install and convenient antenna tuner for use with Icom, Alinco, Kenwood, or Yaesu radios. The MFJ-939 comes complete with interface cable and programmed for your particular radio.
The MFJ-939 Plug&Play IntelliTunerTM lets you rapidly tune any unbalanced or single-wire antenna automatically. MFJ's exclusive InstantRecallTM, IntelliTuneTM and AdaptiveSearchTM algorithms give you fast automatic tuning with more than 20,000 non-volatile VirtualAntennaTM memories. The antenna has eight banks of memory; with over 2500 non-volatile memories for tuner settings.
The tuner includes a highly efficient switching L-network with wide matching capability, 1.8 to 30 MHz coverage, a radio interface port, and heavy-duty 10 amp/1000 volt relays. It is rated at 200 watts SSB/CW.
A maximum of 256 values of inductance and 256 values of capacitance are available. With the capacitance switched between the input and output side, this provides a total of 131,072 L/C tuning combinations. The nominal tuning ranges are 0 to 24 µH and 0 to 3900 pF.
The MFJ-939 Plug&Play IntelliTuner 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, the tuner settings are instantly restored and you’re ready to operate in milliseconds. The antenna has two sets of four banks of memory, which can learn and remember more than 2500 frequencies and tuner settings. A total of 20000 settings.
TM
learns and remembers. When you transmit, it automatically
When you key your transmitter, MFJ’s InstantRecallTM checks its memory to see if you have operated on that frequency before. If so, tuning is instantaneous and you’re ready to operate. If not, MFJ’s
IntelliTuneTM algorithm (based on MFJ’s famous SWR Analyzer technology) kicks in. It measures the
complex impedance of your antenna. Next, it calculates the components it needs and instantly snaps them in. Finally, it fine-tunes to minimize SWR, and you’re ready to operate – typically in a fraction of a second.
If the antenna impedance is not within the tuner’s measurement range, MFJ’s AdaptiveSearchTM algorithm goes into action. Frequency is measured and relevant components values are determined. Only those values are searched for fast tuning. If it still cannot find a match, the search is performed again using a different search pattern.
The minimum power to tune is approximately two watts, with maximum SWR tuning accuracy occurring at tuning power levels of 10-20 watts.
Like all MFJ’s IntelliTunersTM, the MFJ-939 supports radio tuner interfaces that are compatible with Alinco EDX-2 tuner, Icom AH-3 and AH-4 tuners, Kenwood AT-300 tuner, Yaesu FC-30 tuner, and Yaesu FH-1 and FH-2 remote controls.
When your station radio is upgraded or changed the MFJ-939 can be changed from one radio model to another with the optional interface cables MFJ-5114A (for Alinco), MFJ-5114I (for Icom), MFJ-5114K (for Kenwood); and MFJ-5114Y/Y3/Y4 (for Yaesu) that are available from MFJ Enterprises, Inc. So as the station changes the tuner can change with the station.
The MFJ-939 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.
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
Models
MFJ-939I Icom IC-706, IC-707, IC-718, IC-725, IC-728, IC-736, IC-738, IC-746, IC-756, IC-7000 and compatibles MFJ-939K Kenwood TS-50S, TS-450S, TS-480HX, TS-570S, TS590, TS-690S, TS-850S, TS-870S, TS-2000, and compatibles MFJ-939Y Yaesu FT-100, FT-450, FT-847, FT-857, FT-897, FT-950, and compatibles MFJ-939Y3 Yaesu FT-1000MP and FTdx-9000 MFJ-939Y4 Yaesu FT-2000, and FT-5000
Features
• Automatically matches antennas from 6 to 1600 ohms impedance (SWR up to 32:1)
• Handles 200 watts SSB/CW
• Tunes in less than 15 seconds, usually less than 5 seconds
• Over 20,000 non-volatile memories for tuner settings
• Eight memory banks with over 2500 memories per bank
• Highly efficient switching L-network matching circuit
• 1.8 to 30 MHz continuous frequency coverage
• Audio SWR meter
• Built-in frequency counter for remembering frequency-specific matching values
• Built-in radio interface circuitry for compatible radios
• SO-239 coax fed antenna connector
• SO-239 coax to single wire adaptor
Specifications
• Impedance matching range : 6 to 1600 ohms
• SWR matching range : Up to 8:1 for < 50 ohms and up to 32:1 for > 50 ohms
• Minimum power for tuning : 2 watts
• Maximum power while tuning : 100 watts with fold back, 20 watts without fold back
• RF power limit : 200 watts SSB/CW
• Frequency range : 1.8 to 30 MHz continuous coverage
• Frequency counter accuracy : ±1 kHz across HF bands
• A/D conversion resolution : 8-bit
• Capacitance range : 0 to 3961 pF nominal (256 values)
• Inductance range : 0 to 24.86 µH nominal (256 values)
• Relay rating : 10 amp 1000 volts
• Relay electrical life : 100,000 operations
• Relay mechanical life : 10 million operations
• Memory endurance : 1 million erase/write cycles
• Memory data retention : > 200 years
• Power supply requirements : 12 - 15 volts DC
• Current consumption : 750 mA or less
• Dimensions : 6 1/2 × 2 1/8 × 8 1/4 in; 165 × 54 × 210 mm (w × h × d)
• Weight : Approx. 2.3 lb; 1.04 kg
† Specifications and design are subject to change without notice.
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
FAST START
WARNING
● Never operate the tuner with its cover removed. Contact with the components inside the
tuner while transmitting will result in painful RF burns.
● Locate the tuner so that the rear terminals are not accessible during operation. The single wire connection may have high voltage while transmitting.
● Disconnect all antennas from the tuner during lightning storms.
● Always tune with low power (2-20 watts). Apply maximum power only after tuning up.
● Never exceed tuner specifications.
1. Connect the MFJ-939 to the interface cable and connect the interface cable to the radio.
2. Check the radio instructions to verify that the radio can supply 750mA on the 12V line coming to the interface cable. If the radio can not supply 750mA then connect a 12-15VDC power source capable of supplying 750mA to the tuner.
3. Connect your transmitter to the TRANSMITTER connector using a 50-ohm coaxial cable.
4. Connect your coax-fed antenna to the ANTENNA connector using a 50-ohm coaxial cable, or connect your random wire to the ANTENNA connector through the supplied adaptor.
5. Connect your ground connection to the GROUND post.
6. Press the [POWER] button to turn on the MFJ-939 tuner.
7. Press the [ALT] button momentarily until there is one beep. One beep indicates that memory 1 is selected.
8. Key your transmitter to output a carrier of 2-20 watts CW, FM or AM.
9. Press and hold the [TUNE] button for one second to start the automatic tuning process. When completed, check to ensure an SWR of 1.5 or less has been achieved before increasing RF power.
Note: If you have a tuning solution on one band and you then change bands and attempt to
transmit a tuning signal, the previous tuning solution may be sufficiently severe such that no power is detected by the MFJ-939 (the MFJ-939 will tell you to increase power). When this occurs, simply bypass the MFJ-939 and then initiate a tune.
10. You are ready to transmit with full power.
Note: During the automatic tuning process, the tuner will make some noise. These are the
relays switching at a very high rate and this is normal. Do not be alarmed.
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. The tuner also powers up in the bypass mode. When the tuner power is ON, pressing [TUNE] quickly places the tuner in bypass mode if desired, which is indicated by one beep.
Figure 1 General Setup
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
MODEL
SWR
Front Panel
MFJ Plug&Play IntelliTuner
TM
TUNE
TUNE
POWERALT
AUTOMATIC ANTENNA TUNER
200 Watts SSB / CW
MFJ-939
Figure 2 MFJ-939 Front Panel.
SWR LED: A green LED that illuminates when the SWR is 1.5 or less.
TUNE LED: A red LED that illuminates when the automatic tuning is in progress.
TUNE Button: Has three different functions based on the length of time you press and hold it before
releasing.
Press [TUNE] quickly (less than 0.5 second) to bypass the tuner. One beep indicates bypass mode, where RF from the transmitter goes directly to the antenna with no matching. A second quick press toggles the tuner back to its last L/C setting, and the tuner responds with two beeps.
Press [TUNE] for 0.5 to 2 seconds to start the automatic tuning process. Tuning starts when [TUNE] is released after the 0.5-2 second hold-time. The transmitter must be keyed first with at least two watts of power. When the SWR is already below the target SWR, pressing [TUNE] will fine-tune the match for a lower SWR, if possible. When the automatic tuning is completed, a series of beeps indicates the tuned SWR where one beep indicates SWR of 1.5 or less, two beeps indicate SWR of 1.6 to 2.0, three beeps indicate SWR of 2.1 to 2.5, and four beeps indicate SWR of 2.6 to 3.0. For SWR above 3.0, “SWR” (di-di-dit di-dah-dah di-dah-dit) will be sent on CW.
Note: You can reverse the two functions above by pressing and holding the [TUNE] button for
approximately 10 seconds. I.e., when the [TUNE] button is pressed and held for 10 seconds. You will hear two beeps. Now pressing [TUNE] momentarily starts the tuning process, and pressing and holding the [TUNE] button for 0.5-2 seconds puts the tuner into the bypass mode.
“StickyTune” allows for one-handed tuning operation. Normal tuning requires keying the transmitter with one hand and using the other hand to push the [TUNE] button to start the tuning process unless a transceiver interface cable is installed. When StickyTune is enabled, the tuning process starts automatically when the transmitter is keyed with at least two watts of power regardless of the SWR. This works in both automatic and semi-automatic modes. To toggle the StickyTune mode on and off, press and hold the [TUNE] button for two seconds. One beep indicates on and two beeps indicate off. Default is off.
Note: StickyTune resets to OFF when the power is cycled or after tuning.
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
BUTTON ACTION
ALT Button: Has two different functions based on the length of time you press and hold it before
releasing. Press [ALT] quickly (less than one second) to select the primary memory bank to use. Press button to toggle between Memory 1 and Memory 2. One beep indicates Memory 1 and two beeps indicate Memory 2.
Press and hold [ALT] for one second to cycle among the four secondary memory banks of the current primary memory selected. The selected bank is indicated by a series of short beeps, where one beep indicates bank A, two beeps indicate bank B, three beeps indicate bank C, four beeps indicate bank D, and five beeps indicate antenna memory is OFF. See “Antenna Memory” on page 11.
Pressing the [ALT] button will switch the antenna or bank only when there is no RF power; also, the tuner setting for the selected antenna and bank, if available, is instantly restored from memory when enabled.
POWER Button: Used to turn the power on and off. When the power is off, the tuner is bypassed
(straight through from TRANSMITTER to ANTENNA). When power is turned on, the tuner powers up bypassed, but will revert to the last stored matching values or begin tuning on application of RF power when the [TUNE] button is pressed – or if Automatic or StickyTune is enabled.
WARNING: Do not turn the power on and off rapidly, otherwise the tuning setting memory can
be corrupted and the unit will have to be reset to factory defaults.
Note: When the tuner power is OFF, the tuner is bypassed and RF from the transmitter goes directly
to the antenna with no matching.
Automatic/Semi-Automatic Tuning Mode
Pressing [TUNE] and [ALT] simultaneously toggles between automatic and semi-automatic tuning mode. One beep indicates automatic mode and two beeps indicate semi-automatic mode. In automatic mode, the tuning routine is automatically started when at least two watts of power is applied and the SWR is greater than 2.5. In semi-automatic mode, the tuning routine starts only when the [TUNE] button is pressed for
0.5 to 2 seconds.
Note: During the automatic tuning process, the tuner will make some noise. These are the relays
switching at a very high rate and this is normal. Do not be alarmed.
Press in to turn power on, out to turn power off.
Press less than 0.5 second to toggle bypass mode; press and hold for 0.5 to 2 seconds to start the
tuning process; press and hold for more than two seconds to toggle the StickyTune on and off.
Press less than one second to toggle between memory 1 and memory 2; press and hold for more
than one second to cycle through the 2 antenna memory banks.
POWER
TUNE
ALT
Press + to toggle between automatic and semi-automatic mode.
TUNE ALT
Figure 3 Button Action
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
+13.8 V DC input ( 50 mA)
+13.8 V DC input ( 50 mA)
+13.8 V DC input ( 50 mA)
BACK PANEL
POWER
12VDC 750mA
M FJ E NT ERP R I SES, I NC .
STAR K V ILLE, M S U SA
RADIO
INTERFACE
+
GROUNDTRANSMITTER ANTENNA
Figure 4 MFJ-939 Back Panel.
• Power: This jack accepts a standard 2.1 × 5.5 mm coaxial plug with positive center and negative sleeve. The tuner requires 12-15 volts DC at up to 750 mA. The use of a regulated supply is not mandatory but is recommended for best performance. An optional 12 volts DC 1.5 amp power supply, the MFJ-1316, is available from MFJ Enterprises, Inc. WARNING: Do not apply voltages
greater than 18 volts to this unit, or permanent damage may result.
Note: When the tuner power is OFF, the tuner is bypassed and RF from the transmitter goes
directly to the antenna with no matching. When turned on, the tuner powers up in bypass mode.
• Radio Interface: An 8-pin modular (RJ-45) connector for connecting to the tuner interface connector of compatible radios. Most radios provide +13.8 VDC power thought its tuner interface connector. If separate power supplies are used to power the MFJ-939, the MFJ-939 should be powered on first (both LEDs blink once) and then turn on the radio, so the radio knows an external tuner is attached. The radio will disable its internal tuner, if it has one, and
Rear Panel View
12345678
Figure 5 Interface Connector
1
2
3
Ground
4
Ground
5
6
Key/TT/TX
7
TX INH
8
Start/TS/RX
7
7
7
use the external tuner.
The Radio Interface works with radios that are compatible with Alinco EDX-2, Icom AH-3 and AH­4, Kenwood AT-300, and Yaesu FC-30, FH-1 and FH-2. When connected to a compatible radio, simply press the [TUNER] or [AT] button on the radio; for FH-1 or FH-2 compatible Yaesu, press the [TUNE] button on the tuner to start the automatic tuning process. The radio will automatically switch to CW mode, transmit a low power (typically 10-30 watts) carrier, and start the tuning process. Once the automatic tuning is completed, the radio will return to its previous mode and power setting.
WARNING: Make sure the +13.8 volts connection on the radio’s tuner port is
• Transmitter: SO-239 connector for coax cable from transmitter or transceiver
• Ground: Wing-nut terminal for RF ground wire connection.
• Antenna: SO-239 connector for coax cable from antenna.
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capable of supplying the 750 mA of current required by the MFJ-939.
Note: To use a WIRE on the Antenna connector, be sure to use the enclosed adaptor.
MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
Installation
WARNING
● Never operate the tuner with its cover removed. Contact with the components inside
the tuner while transmitting will result in painful RF burns.
● Locate the tuner so that the rear terminals are not accessible during operation. A single wire connection may have high voltage while transmitting.
● Disconnect the antenna from the tuner during lightning storms.
● Always tune with low power (2-20 watts). Apply maximum power only after tuning
up.
● Never exceed tuner specifications.
1. Place the tuner in a convenient location at the operating position. When using a random wire antenna the feed through insulators may have high RF voltages. These voltages can cause serious RF burns if the terminals are touched when transmitting. Be sure to locate the tuner so these terminals cannot accidentally be contacted during operation.
2. Install the tuner between the transmitter and the antenna. Use a 50-ohm coaxial cable (such as RG-58) to connect the transmitter to the connector marked TRANSMITTER on the rear of the tuner. See Figure 1 on page 3.
3. Connect the antenna(s) to the tuner as follows:
• Coaxial feedlines to the SO-239 connectors labeled ANTENNA.
• Random wire to the ANTENNA connector on the back of the unit using the enclosed adaptor.
Note: Route all random wire antennas safely to prevent RF burn hazard.
4. A GROUND post is provided for an RF ground connection. See “Grounding Hints” on page 25.
5. Connect a 12 to 15 VDC power source to the input jack labeled POWER if your radio is not capable of supplying 750mA to the tuner. See your radio operations manual.
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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
General Tuner Setup and Cabling
The MFJ-939 comes with the interface cable and the jumpers preset to allow for a quick “Plug and Play” setup.
1 With the radio off connect the interface cable to the radio and MFJ-939.
2 Connect the antenna to the Antenna coax connector as listed on page7.
3 Connect the RF line from the radio coax connector to the MFJ-939 Radio coax connector as
listed on page 7.
4 Ground the unit. See the Grounding Hints section on page 25.
5 Turn on the tuner first then the radio.
6 Follow the radio instruction manual for setting up the operation of an external tuner. See the
Operation, Radio Interface, and Connection information sections for additional details for the radios listed below.
As the station changes the tuner can be reconfigured as listed in the Interface section of each model to function with other radios by replacing the interconnect cable and changing jumpers in the tuner.
Figure 6 General Setup
Modification to Change Radio Model
Changing the MFJ-939 to use with another model of radio is not difficult to do. For the radio model you are changing to obtain the proper interface cable and change the jumpers in the tuner to the positions needed for the new radio. See the section Radio Interface and Connections under the new radio you are changing to for interface model and jumper settings.
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