Super-Compact IntelliTuner
Automatic Antenna Tuner
TM
Model MFJ-925
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
COPYRIGHT
C
2006-2010 MFJ ENTERPRISES, INC.
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 8-4:30 CST.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Contents
THE BASICS
Introduction...................................................................................................................................... 1
Features............................................................................................................................................ 2
Specifications................................................................................................................................... 2
Fast Start .......................................................................................................................................... 3
Front Panel....................................................................................................................................... 4
SWR LED ........................................................................................................................... 4
TUNE LED ......................................................................................................................... 4
TUNE Button...................................................................................................................... 4
StickyTuneTM .......................................................................................................... 4
Automatic/Semi-Automatic Tuning Mode ............................................................ 5
ALT Button......................................................................................................................... 5
POWER Button................................................................................................................... 5
Back Panel ....................................................................................................................................... 6
Power .................................................................................................................................. 6
Radio Interface.................................................................................................................... 6
Jumper JP2............................................................................................................. 7
Jumper JP4............................................................................................................. 7
Transmitter........................................................................................................................ 10
Antenna............................................................................................................................. 10
Ground .............................................................................................................................. 10
Installation ..................................................................................................................................... 10
MISCELLANEOUS
Antenna Memory ........................................................................................................................... 11
IntelliTuneTM Algorithm ................................................................................................................ 11
LC Limits....................................................................................................................................... 11
Morse Code and Beeps .................................................................................................................. 12
Transceiver Foldback..................................................................................................................... 12
Grounding Hints ............................................................................................................................ 13
Antenna System Hints.................................................................................................................... 13
Location ............................................................................................................................ 13
Matching Problems ........................................................................................................... 13
© 2006-2010 MFJ Enterprises, Inc.
i
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
APPENDICES
Resetting the Tuner ........................................................................................................................ 15
Factory Defaults................................................................................................................ 15
Delete Entire Antenna Memory ........................................................................................ 16
Delete Antenna Memory Bank ......................................................................................... 16
Total Reset ........................................................................................................................ 16
Self Test ......................................................................................................................................... 17
Power-Down Circuit Test .............................................................................................................. 18
Relay Test ...................................................................................................................................... 18
Frequency Counter Calibration...................................................................................................... 19
SWR Bridge Calibration ................................................................................................................ 20
Alinco Radio Interface................................................................................................................... 21
Connections ...................................................................................................................... 21
Operation .......................................................................................................................... 21
Icom Radio Interface...................................................................................................................... 22
Connections ...................................................................................................................... 22
Operation .......................................................................................................................... 22
Kenwood Radio Interface .............................................................................................................. 23
Connections ...................................................................................................................... 23
Operation .......................................................................................................................... 23
Yaesu Radio Interface/MFJ-5114Y ............................................................................................... 24
Connections for FT-100.................................................................................................... 24
Operation for FT-100........................................................................................................ 24
Connections for FT-450.................................................................................................... 25
Operation for FT-450........................................................................................................ 25
Connections for FT-857 or FT-897................................................................................... 26
Operation for FT-857 or FT-897....................................................................................... 26
Connections for FT-950.................................................................................................... 27
Operation for FT-950........................................................................................................ 27
Yaesu Radio Interface/MFJ-5114Y3 ............................................................................................. 28
Connections for FT-1000MP series of radios ................................................................... 28
Operation for FT-1000MP series of radios ....................................................................... 28
Connections for FT-2000 series of radios......................................................................... 28
Operation for FT-2000 series of radios............................................................................. 29
Connections for FTDX-9000 series of radios..................................................................... 29
Operation for FTDX-9000 series of radios......................................................................... 30
Yaesu Radio Interface/MFJ-5114Y4 ............................................................................................. 30
Connections for FT-2000 series of radios......................................................................... 30
Operation for FT-2000 series of radios............................................................................. 30
In Case of Difficulty ...................................................................................................................... 31
Technical Assistance...................................................................................................................... 31
List of Accessories......................................................................................................................... 31
Circuit Block Diagram................................................................................................................... 32
ii
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
FIGURES
Figure 1. Typical Installation Block Diagram ................................................................................ 3
Figure 2. MFJ-925 Front Panel....................................................................................................... 4
Figure 3. Button Action .................................................................................................................. 5
Figure 4. MFJ-925 Back Panel ....................................................................................................... 6
Figure 5. Radio Interface Connector............................................................................................... 6
Figure 6. Alinco Interface Cable..................................................................................................... 7
Figure 7. Icom Interface Cable ....................................................................................................... 8
Figure 8. Kenwood Interface Cable ................................................................................................ 8
Figure 9. Yaesu Interface Cable (FT-100/-450/-857/-897/-950) .................................................... 9
Figure 10. Yaesu Interface Cable (MP/2000/9000 series) .............................................................. 9
Figure 11. Yaesu Interface Cable (FT-2000 series) ........................................................................ 9
Figure 12. Power-On Operations .................................................................................................. 15
Figure 13. MFJ-925 Circuit Block Diagram................................................................................. 32
TABLES
Table 1.
Table 2.
Table 3.
Table 4.
Jumper JP2 Setting............................................................................................................ 7
Memory Resolution ........................................................................................................ 11
Tuner Beeps .................................................................................................................... 12
Failure Messages............................................................................................................. 17
© 2006-2010 MFJ Enterprises, Inc.
iii
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
THIS PAGE IS LEFT BLANK INTENTIONALLY
iv
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
The Basics
Introduction
The MFJ-925 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-925 IntelliTunerTM 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, the tuner settings are instantly
restored and you’re ready to operate in milliseconds. The antenna has four banks of memory, which can
learn and remember more than 2500 frequencies and tuner settings.
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-925 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. Optional interface cables MFJ-5114A (for Alinco), MFJ-5114I
(for Icom), MFJ-5114K (for Kenwood); and MFJ-5114Y/Y3/Y4 (for Yaesu) are available from MFJ
Enterprises, Inc.
The MFJ-925 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.
© 2006-2010 MFJ Enterprises, Inc.
1
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
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
Built-in bias tee
SO-239 coax fed antenna connector
SO-239 coax to single wire adaptor
Specifications
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Impedance matching range
SWR matching range
Minimum power for tuning
Maximum power while tuning
RF power limit
Frequency range
Frequency counter accuracy
A/D conversion resolution
Capacitance range
Inductance range
Relay rating
Relay electrical life
Relay mechanical life
Memory endurance
Memory data retention
Power supply requirements
Current consumption
Dimensions
Weight
†
Specifications and design are subject to change without notice.
2
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
6 to 1600 ohms
Up to 8:1 for < 50 ohms and up to 32:1 for > 50 ohms
2 watts
100 watts with foldback, 20 watts without foldback
200 watts SSB/CW
1.8 to 30 MHz continuous coverage
±1 kHz across HF bands
8-bit
0 to 3961 pF nominal (256 values)
0 to 24.86 μH nominal (256 values)
10 amp 1000 volts
100,000 operations
10 million operations
1 million erase/write cycles
> 200 years
12 - 15 volts DC
750 mA or less
6 1/2 × 2 1/8 × 8 1/4 in; 165 × 54 × 210 mm (w × h × d)
Approx. 2.3 lb; 1.04 kg
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact 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-925 to a 12-15 VDC voltage source capable of supplying at least 750 milli-amps.
2. Connect your transmitter to the TRANSMITTER connector using a 50-ohm coaxial cable.
3. 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.
4. Connect your ground connection to the GROUND post.
5. Press the [POWER] button to turn on the MFJ-925 tuner.
6. Press the [ALT] button momentarily until there is one beep. One beep indicates that memory 1 is
selected.
7. Key your transmitter to output a carrier of 2-20 watts CW, FM or AM.
8. 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-925 (the MFJ-925 will tell you to increase power).
When this occurs, simply bypass the MFJ-925 and then initiate a tune.
9. 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.
Antenna
Transmitter
MFJ-925
50-ohm Coax
RF Ground
12 VDC
Figure 1. Typical Installation Block Diagram.
© 2006-2010 MFJ Enterprises, Inc.
3
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Front Panel
TUNE
MFJ IntelliTunerTM
ALT
POWER
SWR TUNE
AUTOMATIC ANTENNA TUNER
200 Watts SSB / CW
MODEL
MFJ-925
Figure 2. MFJ-925 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:
4
StickyTune resets to OFF when the power is cycled or after tuning.
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
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.
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.
BUTTON ACTION
Press
POWER
Press
TUNE
in to turn power on, out to turn power off.
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
ALT
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.
Press
TUNE
+
ALT
to toggle between automatic and semi-automatic mode.
Figure 3. Button Action.
© 2006-2010 MFJ Enterprises, Inc.
5
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Back Panel
POWER
12VDC
750mA
MFJ ENTERPRISES, INC.
STARKVILLE, MS USA
RADIO
INTERFACE
+
TRANSMITTER
GROUND
ANTENNA
Figure 4. MFJ-925 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. The MFJ-925 also accepts 12 volts
that is impressed on the incoming coax cable using an MFJ-4116 or MFJ-4117 Bias Tee for remote
operation.
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-925, the
MFJ-925 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 use the external tuner.
Rear Panel View
12345678
1
+13.8 V DC input (750 mA)
2
+13.8 V DC input (750 mA)
3
+13.8 V DC input (750 mA)
4
Ground
5
Ground
6
Key/TT/TX
7
TX INH
8
Start/TS/RX
Figure 5. Radio Interface Connector.
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 capable of
supplying the 750 mA of current required by the MFJ-925.
6
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Jumper JP2
Jumper JP2, located behind the front panel circuit board, selects the radio to be connected to the
Radio Interface connector. Set this jumper to the “I” position to interface with radios that are
compatible with the Alinco EDX-2 tuner, Icom AH-3 and AH-4 tuners, Yaesu FT-1000MP series,
FT-2000 series, FTDX-9000 series, and any radios that are compatible with Yaesu FH-1 or FH-2
remote control. Set the jumper to the “K” position to interface with radios that are compatible with
Kenwood AT-300 tuner. Set the jumper to the “Y” position to interface with radios that are
compatible with Yaesu FC-30 tuner. If no connection is connected to the Radio Interface connector,
set the jumper to the “0” position to disable the interface. Default is “0”.
Jumper JP2
0
I
K
Y
1
2
3
4
To Interface
No Radio Interface
Alinco
Icom
Yaesu FT-1000MP/-2000/-9000
Yaesu FT-2000
Kenwood
Yaesu FT-100/-450/-857/-897/-950
Reserved
Reserved
Reserved
Reserved
Using
-MFJ-5114A
MFJ-5114I
MFJ-5114Y3
MFJ-5114Y4
MFJ-5114K
MFJ-5114Y
-----
Table 1. Jumper JP2 Setting.
Jumper JP4
Jumper JP4, located about one inch or 3 cm in front of the Radio Interface connector, inside the MFJ925 must be configured properly when interfacing to the various radios. Normally this jumper is
installed and is the factory default. Remove this jumper when interfacing to an Icom IC-7000.
Make sure this jumper is installed when interfacing to Kenwood radios and FC-30 compatible Yaesu
radios using the MFJ-5114K and MFJ-5114Y interface cables, respectively. For the other radios, the
position of jumper JP4 is irrelevant.
The MFJ-5114A interface cable provides control signals between an Alinco radio and the MFJ
automatic tuner. Supported Alinco radios are DX-70, DX-77, DX-701, DX-801, and any Alinco
radio that supports the Alinco EDX-2 tuner. Press the radio’s [TUNE] button to start the tuning
process; for DX-70 press [FUNC] then [TUNE]. Refer to “Alinco Radio Interface” on page 21 for
connections and operation.
1 Pin 1 (Ground) connects to pins 4 and 5 of Radio Interface Plug.
2 Pin 2 (+13.8V) connects to pins 2 and 3 of Radio Interface Plug.
3 Pin 3 (Key) connects to pin 6 of Radio Interface Plug.
4 Pin 4 is not connected.
5 Pin 5 (Start) connects to pin 8 of Radio Interface Plug.
Figure 6. Alinco Interface Cable.
© 2006-2010 MFJ Enterprises, Inc.
7
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
The MFJ-5114I interface cable provides control signals between an Icom radio and the MFJ
automatic tuner. Supported Icom radios are IC-706, IC-707, IC-718, IC-725, IC-728, IC-736, IC-738,
IC-746, IC-756, IC-7000, and any Icom radio that supports the Icom AH-3 or AH-4 tuner. Push and
hold the radio’s [TUNER] button for two seconds to start the tuning process. Push [TUNER] quickly
to bypass the tuner. Make sure jumper JP4 is removed for IC-7000. Refer to “Icom Radio
Interface” on page 22 for connections and operation.
1 Pin 1 (Key) connects to pin 6 of Radio Interface Plug.
2 Pin 2 (Start) connects to pin 8 of Radio Interface Plug.
3 Pin 3 (+13.8V) connects to pins 2 and 3 of Radio Interface Plug.
4 Pin 4 (Ground) connects to pins 4 and 5 of Radio Interface Plug.
Figure 7. Icom Interface Cable.
The MFJ-5114K interface provides control signals between a Kenwood radio and the MFJ automatic
tuner. Supported Kenwood radios are TS-50S, TS-450S, TS-480HX, TS-570S, TS-690S, TS-850S,
TS-870S, TS-2000, and any Kenwood radio that supports the Kenwood AT-300 tuner. Push and hold
the radio’s [AT TUNE] button for one second to start the tuning process. Push the [AT TUNE]
quickly to bypass the tuner or to cancel tuning in progress. Make sure jumper JP4 is installed. Refer
to “Kenwood Radio Interface” on page 23 for connections and operation.
Note:
The TS-480HX will automatically reduce its TX power to 100 watts maximum (25 watts
AM) when the radio interface is used.
Note:
For the TS-2000, use the ANT 1 and AT connectors on the radio to connect an external
antenna tuner. If the external tuner is connected to the ANT 2 connector on the radio, the
external tuner will not function with the radio interface.
Kenwood
Rear Panel View
1 Pin 1 (Ground) connects to pin 4 of Radio Interface Plug.
2 Pin 2 (TT) connects to pin 6 of Radio Interface Plug.
3 Pin 3 (Ground) connects to pin 5 of Radio Interface Plug.
1
2
3
4 Pin 4 is not connected.
4
5
6
5 Pin 5 (TS) connects to pin 8 of Radio Interface Plug.
6 Pin 6 (+13.8V) connects to pins 2 and 3 of Radio Interface Plug.
Figure 8. Kenwood Interface Cable.
The MFJ-5114Y interface provides control signals between a Yaesu radio and the MFJ automatic
tuner. Supported Yaesu radios are FT-100, FT-450, FT-857, FT-897, FT-950, and any Yaesu radio
that supports the Yaesu FC-30 tuner. Push and hold the radio’s (TUN) or (TUNE) key to start the
tuning process. Make sure jumper JP4 is installed. Refer to “Yaesu Radio Interface/MFJ-5114Y” on
pages 24 to 27 for connections and operation.
8
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
1 Pin 1 (TX INH) connects to pin 7 of Radio Interface Plug.
2 Pin 2 is not connected.
Yaesu
Rear Panel View
3 Pin 3 (SENSE) connects to pin 5 of Radio Interface Plug.
4 Pin 4 (TX) connects to pin 6 of Radio Interface Plug.
1 2 3
4
5 6
7 8
5 Pin 5 (RX) connects to pin 8 of Radio Interface Plug.
6 Pin 6 (Ground) connects to pin 4 of Radio Interface Plug.
7 Pin 7 is not connected.
8 Pin 8 (+13.8V) connects to pin 3 of Radio Interface Plug.
Figure 9. Yaesu Interface Cable (FT-100/-450/-857/-897/-950).
The MFJ-5114Y3 interface provides control signals between a Yaesu radio and the MFJ automatic
tuner. Supported Yaesu radios are FT-1000MP, FT-1000MP MKV, FT-1000MP MKV Field, FT2000, FTDX-9000, and any Yaesu radio compatible with the Yaesu FH-1 or FH-2 Remote Control.
This cable plugs into the REMOTE jack on the rear panel of the Yaesu radios, and keys the Yaesu
radios in the CW tune mode whenever the MFJ-925’s [TUNE] button is pushed. MFJ recommends
that the Yaesu CW tune setting be set to 10 watts (Yaesu MP menu selection 4-3) during the tune
process when an amplifier is not used. For best accuracy when an amplifier is used, MFJ
recommends that the Yaesu CW tune setting be set to 50 watts for 100-watt transceivers and 75 watts
for 200-watt MKV transceivers during the tune process. If a FH-1 or FH-2 keypad is also used, both
the FH-1/FH-2 and the radio control cable may be plugged in parallel using a 3.5-mm headphone
splitter (mono or stereo is fine). Refer to “Yaesu Radio Interface/MFJ-5114Y3” on pages 28 to 30 for
connections and operation.
1N4148 22.1K
1 Tip (KEY) connects to pin 6 of Radio Interface Plug
4.2V + 0.13V
2 Sleeve (GND) connects to pins 4 and 5 of Radio Interface Plug.
with a diode and a 22.1k ohm 1% resistor in series.
KEY
GND
Figure 10. Yaesu Interface Cable (MP/2000/9000 series).
While the MFJ-5114Y3 works with the FT-2000, the FT-2000 also has a TX REQ input that can be
used. If you prefer to use the TX REQ input, the MFJ-5114Y4 interface provides control signals
between the Yaesu FT-2000 and FT-2000D radios and the MFJ automatic tuner. This cable plugs
into the TX REQ RCA jack on the rear panel of these Yaesu radios, and keys the Yaesu radios in the
CW tune mode whenever the MFJ-925’s [TUNE] button is pushed. MFJ recommends that the Yaesu
tune power setting be set to 20 watts (Yaesu menu 145 tGEn TUN PWR) during the tune process.
Refer to “Yaesu Radio Interface/MFJ-5114Y4” on page 30 for connections and operation.
GND
1 Center pin (KEY) connects to pin 6 of Radio Interface Plug.
2 Ground (GND) connects to pins 4 and 5 of Radio Interface Plug.
KEY
Figure 11. Yaesu Interface Cable (FT-2000 series).
© 2006-2010 MFJ Enterprises, Inc.
9
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
•
Transmitter: SO-239 connector for coax cable from transmitter or transceiver. There is a bias tee
connected to this connector so 12 volts DC can be sent down the coax to power the tuner for remote
operation. An optional bias tee DC power injector, the MFJ-4116 or MFJ-4117, is available from
MFJ Enterprises, Inc.
•
Ground: Wing-nut terminal for RF ground wire connection.
•
Antenna: SO-239 connector for coax cable from antenna.
Note:
To use a WIRE on the Antenna connector, be sure to use the enclosed adaptor.
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 RG58) 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 13.
5. Connect a 12 to 15 VDC power source to the input jack labeled POWER.
10
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Miscellaneous
Antenna Memory
The “memory resolution” is the width of frequency spectrum that the tuner recognizes as being the same
as a tuned frequency already in memory. The memory resolution is approximately 0.1 percent of the
lower frequency of each amateur band. For example, the memory resolution on the 40-meter band (7000
to 7300 kHz) is 7 kHz; if the tuner has memorized a setting for 7050 kHz, it will automatically call up this
setting for any frequency from 7047 to 7053 kHz. Memory resolution is smaller at lower frequency to
accommodate the higher antenna Q and larger at higher frequency where the antenna Q is lower. The
memory resolutions for the HF amateur bands 160 through 10 meters are:
Meter
160
75/80
60
40
30
20
17
15
12
10
Frequency Range (kHz)
1800 – 2000
3500 – 4000
5330.5, 5346.5, 5366.5, 5371.5 and 5403.5
7000 – 7300
10100 – 10150
14000 – 14350
18068 – 18168
21000 – 21450
24890 – 24990
28000 – 29700
Memory Resolution (kHz)
2
4
5 memory locations
7
10
14
18
21
25
28
Table 2. Memory Resolution.
The memory resolution for non-amateur frequency bands between 160 and 10 meters is approximately
0.2 percent of the lower frequency of each band. There are two primary memory banks, each with four
secondary memory banks. Each secondary memory bank has 2500 memory locations. Tuner settings are
stored in memory separately in primary memory 1 and primary memory 2. This provides memory for up
to eight different antennas. See “ALT Button” on page 5. Defaults are memory banks 1A and 2A ON.
IntelliTuneTM Algorithm
When the tuner cannot find an appropriate setting in its memory, it begins its calculation function. It
measures the complex impedance of the antenna (load) at the transmitting frequency, then it calculates the
LC components needed for a match. Then it fine-tunes the components for minimum SWR. If for any
reason the tuner cannot calculate the load impedance, it proceeds to yet another method of calculation.
LC Limits
The upper limits of inductance (L) and capacitance (C) are factory-limited according to frequency and
maximum power rating; i.e., higher frequencies need less inductance and less capacitance when the Lnetwork is properly tuned. These limits are built into the MFJ-925 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.
© 2006-2010 MFJ Enterprises, Inc.
11
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Morse Code and Beeps
If insufficient power is applied for tuning (less than two watts), “QRO” (dah-dah-di-dah di-dah-dit dahdah-dah) will be sent on CW. Increasing the input power above two watts ends this message.
When input power is too high, the tuner enters a self-protection mode. The tuner will not allow any of its
relays to change to prevent damage to your tuner. If too much power is applied when tuning, the tuner
will cease the tuning routine and send “QRP” (dah-dah-di-dah di-dah-dit di-dah-dah-dit) on CW. This
occurs when the forward power exceeds 75 watts and the SWR is greater than 3.0, or when the forward
power exceeds 125 watts regardless of the SWR.
If more than 200 watts is applied to the tuner, the tuner will go into bypass mode and send “QRT” (dahdah-di-dah di-dah-dit dah) on CW.
If the tuning process is activated under these conditions, the tuner will not start the tuning. It will send
the appropriate code on CW.
The following table shows the various tuner beeps:
Function
Primary Memory
Memory Bank
Bypass Toggle
Tuned SWR
StickyTune
Tuning Mode
Indicates By
Indicates By
One Beep
Two Beeps
1
2
Bank A
Bank B
Bank C
Bank D
Off
(1 beep)
(2 beeps)
(3 beeps)
(4 beeps)
(5 beeps)
Bypass Mode
Restore Last L/C Setting
(L = 0 and C = 0)
SWR ≤1.5 SWR ≤2.0 SWR ≤2.5 SWR ≤3.0 SWR >3.0
(1 beep)
(2 beeps)
(3 beeps)
(4 beeps)
(“SWR”)
On
Off
Automatic
Semi-Automatic
By Pressing
[ALT] < 1 second
[ALT] > 1 second
[TUNE] < 0.5 sec.
[TUNE] for
0.5 to 2 seconds
[TUNE] > 2 seconds
[TUNE] + [ALT]
Table 3. Tuner Beeps.
Transceiver Foldback
Modern transceivers with solid-state finals usually have a foldback circuit to protect the final transistors
from damage due to high SWR. A foldback circuit detects the SWR during transmit and reduces the
output power as the SWR rises above a preset threshold, usually 2:1. The higher the SWR the lower the
power is set to prevent damage.
If your transceiver has a foldback circuit, you can simply key down and tune at any power level from 2 to
100 watts. If your transceiver does not have a foldback circuit, you must manually set the power level to
20 watts or less for tuning. At higher power levels, the reflected power occurred during tuning can
damage your transceiver or amplifier and causes component arcing which can damage the relays in the
tuner.
Check your transceiver owner's manual to see if it has a foldback circuit.
amplifier must be bypassed during tuning.
Note:
12
When an amplifier is used, the
MFJ recommends that a transceiver-specific interface cable be used between the MFJ-925
and your transceiver to ensure that tuning only occurs at low power.
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Grounding Hints
To minimize RFI, single wire feedlines (such as used with Windom or longwire antennas) should be kept
away from other wiring. Radiation will be minimized if the single wire feeder runs parallel and
reasonably close to the wire that connects the tuner to the outdoor ground. The antenna feed wire should
be adequately insulated to prevent arcing or accidental contact.
CAUTION
For operator safety, a good outside earth ground or water pipe ground should always be
installed and connected to the case of the MFJ-925. 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, always use good DC and RF grounds. It is particularly important to have a good RF ground
when using a single wire feeder since the tuner needs something to "push" against in order to force
current into the single wire feedline. If a good RF ground is not available, RF will usually find its way
back into the power line (RFI), transmitter audio circuits (RF feedback), or the operator (RF burns).
Metal water pipes and ground rods provide good DC and AC safety grounds, but they are almost useless
for dependable RF grounding.
RF grounds work much better when "spread out" over a large area, especially when they employ multiple
connections directly to the equipment ground point. Metal water pipes, heating ducts, and fences may
work (especially if they are connected together with multiple wires), but the best RF grounds are radial
systems or multi-wire counterpoises. Radials and counterpoises provide large, low resistance surfaces for
RF energy.
RF and lightning travel on the surface of conductors. Braided or woven conductors have high surface
resistance to lightning and RF. Ground leads for RF and lightning should have wide smooth surfaces.
Avoid the use of woven or braided conductors in RF and lightning grounds unless the lead needs to be
flexible.
Antenna System Hints
Location
For the best performance, an end-fed longwire 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 good RF grounds help the signal in almost any transmitting
installation, it is extremely important to have good RF grounds with long wire or other Marconi-style
antennas.
Matching Problems
Most matching problems occur when the antenna system presents an extremely high impedance to the
tuner. When the antenna impedance is much lower than the feedline impedance, an odd quarterwavelength 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
© 2006-2010 MFJ Enterprises, Inc.
13
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
a half-wavelength. The half-wavelength line repeats the very high antenna impedance at the tuner.
Incorrect feedline and antenna lengths can make an otherwise perfect antenna system very difficult or
impossible to tune.
One example where this problem occurs is on 80 meters when an odd quarter-wave (60 to 70 feet) open
wire line is used to feed a half-wave (100 to 140 feet) dipole. The odd quarter-wave line transforms the
dipole's low impedance to over three thousand ohms at the tuner. This is because the mismatched
feedline is an odd multiple of 1/4 wavelength long. The line inverts (or teeter-totters) the antenna
impedance.
A problem also occurs on 40 meters with this same antenna example. The feedline is now a multiple of a
half-wave (60 to 70 feet) and connects to a full-wave high impedance antenna (100 to 140 feet). The halfwave line repeats the high antenna impedance at the tuner. The antenna system looks like several
thousand ohms at the tuner on 40 meters.
This places enormous strain on the balun and the insulation in the tuner, since voltages can reach several
thousand volts. This can cause component arcing and heating.
The following suggestions will reduce the difficulty in matching an antenna with a tuner:
•
Never center feed a half-wave multi-band antenna with a high impedance feedline that is close to an
odd multiple of a quarter-wave long.
•
Never center feed a full-wave antenna with a feedline close to a multiple of a half-wave long.
•
If this tuner will not "tune" a multi-band antenna, add or subtract 1/8 wave of feedline (for the band
that won't tune) and try again.
•
Never try to load a G5RV or center fed dipole on a band below the half-wave design frequency. If
you want to operate an 80-meter antenna on 160 meters, feed either or both conductors as a longwire
against the station ground.
To avoid problems matching or feeding any dipole antenna with high impedance open wire lines, keep the
lines around these lengths. [The worst possible line lengths are shown in brackets]:
160 meters dipole:
80 meters dipole:
40 meters dipole:
35-60, 170-195 or 210-235 feet
34-40, 90-102 or 160-172 feet
42-52, 73-83, 112-123 or 145-155 feet
[Avoid 130, 260 ft]
[Avoid 66, 135, 190 ft]
[Avoid 32, 64, 96, 128 ft]
Some slight trimming or adding of feedline may be necessary to accommodate the higher bands.
WARNING
To avoid 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 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.
14
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Appendices
POWER-ON OPERATIONS
(Press and hold buttons while turning on the power.)
Press and hold
TUNE
Press and hold
TUNE
+
Press and hold
ALT
+
POWER
then press
TUNE 1 time to reset factory defaults.
Press and hold
ALT
+
POWER
then press
TUNE 2 times to delete current memory bank.
Press and hold
ALT
+
POWER
then press
TUNE 3 times to perform total reset.
Press and hold
ALT
+
POWER
then press
TUNE 4 times to test the power-down circuitry.
Press and hold
ALT
+
POWER
then press
TUNE 5 times to test the relays.
Press and hold
ALT
+
POWER
then press
TUNE 6 times to calibrate the frequency counter.
Press and hold
ALT
+
POWER
then press
TUNE 7 times to calibrate the SWR bridge.
For the
ALT
+
ALT
POWER
+
POWER
to start the self test.
+
POWER
to delete current antenna memory.
operations, not pressing
TUNE or pressing it more than seven times
will cancel the operation after idling four seconds, beep two times and then resume normal operation.
Figure 12. Power-On Operations.
Resetting the Tuner
Each time the tuner is powered off, the microprocessor saves all memories and configurations to nonvolatile memory ready to be used the next time the unit is turned on and transmit power is applied. If the
tuner is not working properly, even on initial power on, try resetting to the factory defaults.
Factory Defaults
The unit is shipped with the following default settings:
•
•
•
•
•
†
Inductance
Capacitance
Antenna
Memory
Tuning Mode
0 μH
0 pF on antenna side
1
Banks 1A and 2A on
Automatic
†
†
These settings are stored separately for primary memories 1 and 2.
Note:
Resetting to factory defaults does not erase the antenna memories.
© 2006-2010 MFJ Enterprises, Inc.
15
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
To reset the tuner to these defaults:
1. Turn off the power to the tuner.
2. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
3. Within four seconds of releasing [ALT], press the [TUNE] button once.
4. After releasing [TUNE] for four seconds, beep three times and resume normal operation.
WARNING:
If the MFJ-925 is not behaving properly or is acting erratically, try resetting the
tuner to factory defaults.
Delete Entire Antenna Memory
To delete an entire antenna memory (all four banks), first select the primary memory (1 or 2) that you
want to delete. See “ALT Button” on page 5 for details.
1. Turn off the power to the tuner.
2. Press and hold both the [TUNE] and [ALT] buttons while turning the power on. It takes
approximately three seconds to delete all four memory banks of the current antenna.
3. Beep three times and release the buttons to resume normal operation. Remember that the selected
antenna memory will be lost!
Delete Antenna Memory Bank
To delete an antenna memory bank, first select the primary memory (1 or 2) and the memory bank (A, B,
C or D) that you want to delete. See “ALT Button” on page 5 for details.
1. Turn off the power to the tuner.
2. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
3. Within four seconds of releasing [ALT], press the [TUNE] button two times.
4. After releasing [TUNE] for four seconds, the current memory bank is deleted.
5. The unit will beep three times and resume normal operation. Remember that the selected antenna
memory bank will be lost! However, if the memory is off, no memory bank is deleted; then beep
two times and resume normal operation.
6. Repeat the above procedure to delete the other memory banks, if desired.
Total Reset
To erase both primary memories (all eight banks) and reset to factory defaults:
1. Turn off the power to the tuner.
2. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
3. Within four seconds of releasing [ALT], press the [TUNE] button three times.
4. After releasing [TUNE] for four seconds, both primary memories are deleted and factory defaults
are reset. The total reset takes approximately six seconds.
5. The unit will beep three times and resume normal operation. Remember that both primary
memories will be lost!
16
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Self Test
A self-test routine will check the functions of the MFJ-925. This routine checks the LEDs, the frontpanel buttons, the internal memory, the audio circuitry, and the power-down circuitry. During the selftest, you may stop the test by turning off the unit; however, this should NOT be done during the memory
test or the memory could be corrupted. The self-test can be completed in approximately 10 seconds.
Note:
Performing the self-test will reset the unit to its factory default settings.
Here is the self-test procedure:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Turn off the power to the tuner.
Unplug the radio interface cable, if one is connected, from the tuner.
Press and hold only the [TUNE] button while turning the power on.
The test begins by blinking the firmware version number via the two front panel LEDs. The
green LED blinks first, followed by the red LED. The version number X.Y is represented by the
number of times the green LED blinks for X and the number of times the red LED blinks for Y.
For example, green LED blinks one time and red LED blinks two times represent firmware
version number 1.2. This is also the test of the LEDs.
Release the [TUNE] button. The unit then checks for short circuits, power-down detection level,
and wakeup circuitry.
Press [ALT] button and the green LED should blink once.
Press [TUNE] button and the green LED should blink once.
The unit then tests its non-volatile memory. Notice this step will reset the unit to its factory
default settings.
If the unit is okay, a repetitive message “PASS” will be sent as Morse code (di-dah-dah-dit di-dah
di-di-dit di-di-dit) and the green LED will blink. If there is a problem, a failure message will be
sent repetitively and the red LED will blink.
Once you have confirmed that the audio is okay, turn the unit off.
11. Wait one second and turn the unit on again to test the power-down detection circuitry.
12. If the power-down detection circuitry is okay, a repetitive message “PASS” will be sent as Morse
code (di-dah-dah-dit di-dah di-di-dit di-di-dit) and the green LED will blink. If there is a
problem, message “PD FAIL” will be sent as Morse code repetitively and the red LED will blink.
13. Turn the power off.
Failure
Message
ANT FAIL
TUNE FAIL
MEMORY FAIL
WAKEUP FAIL
PD FAIL
Indicates
[ALT] button is shorted or improperly connected.
[TUNE] button is shorted or improperly connected.
Non-volatile memory circuitry is improperly connected.
Microprocessor wakeup circuitry problem.
Power-down circuitry problem.
Table 4. Failure Messages.
© 2006-2010 MFJ Enterprises, Inc.
17
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Power-Down Circuit Test
When the 12 VDC power to the tuner is turned off, the tuner saves all settings to non-volatile memory.
The Power-Down Circuit Test checks the power-down detection circuitry. It is recommended that this
test be done immediately after the regular self-test described above.
Note:
The tuner must be reset to factory defaults before performing this test.
Here is the test procedure:
1. Make sure power to the tuner is off.
2. If the tuner has been reset to factory defaults, skip to step 6; otherwise continue with step 3.
3. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
4. Within four seconds of releasing [ALT], press the [TUNE] button once.
5. After releasing [TUNE] for four seconds, beep three times and turn the power off.
6. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
7. Within four seconds of releasing [ALT], press the [TUNE] button four times.
8. After releasing [TUNE] for four seconds and if the power-down detection circuitry is okay, a
repetitive message “PASS” will be sent as Morse code (di-dah-dah-dit di-dah di-di-dit di-di-dit)
and the green LED will blink. If there is a problem, message “PD FAIL” will be sent as Morse
code repetitively and the red LED will blink.
9. Turn the power off.
Relay Test
WARNING: Turn off the transmitter power or disconnect the transmitter before performing
this test; otherwise, damage to the tuner can result.
To test the relays and their control circuitry;
1. Turn off the power to the tuner.
2. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
3. Within four seconds of releasing [ALT], press the [TUNE] button five times.
4. After releasing [TUNE] for four seconds, beep once and the Relay Test routine is initiated.
5. Press the [TUNE] button to engage the relay and the red LED will turn on. Release the [TUNE]
button to disengage the relay and the red LED will turn off. Listen for relay clicks.
6. There are 18 relays in the tuner, yet there are 19 test positions. The second relay tested (K2) is
not used in this unit. There will be no relay click for K2. Press the [ALT] button to test the next
relay. The green LED will illuminate until the [ALT] button is released.
7. Repeat Steps 5 and 6 to test all 18 relays (in the order of relay K1 to K19, K2 is not used in this
unit).
8. After releasing [ALT] on the 19th test position, the unit will beep three times and resume normal
operation.
18
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Frequency Counter Calibration
To calibrate the frequency counter, you will need a transmitter, a 50-ohm dummy load, two 50-ohm SO239 coax cables, a Phillips screwdriver, and a tuning tool or small flat blade screwdriver.
WARNING: Do not touch anything inside the tuner during operation! Serious, painful RF
burns can result.
WARNING: Never operate the MFJ-925 with its cover removed; dangerous voltages and
currents can be present during operation. Never exceed tuner specifications.
1. Turn off the power to the transmitter and the tuner.
2. Remove the cover from the tuner (10 screws) with a Phillips screwdriver.
3. Connect the 50-ohm dummy load to the ANTENNA connector; connect the transmitter to the
TRANSMITTER connector on the tuner.
4. Turn on the power to the transmitter. Set and lock the frequency to exactly 29.000 MHz.
5. Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
6. Within four seconds of releasing [ALT], press the [TUNE] button six times.
7. After releasing [TUNE] for four seconds, the green LED lights up and the Frequency Counter
Calibration is initiated.
8. Key the transmitter to output about 10 watts and adjust trimmer capacitor VC3 (located next to
the big integrated circuit on the front side of the front panel circuit board) until both LEDs are
lighted up. The green LED lights when the calibration is below 29 MHz, the red LED lights
when the calibration is above 29 MHz and both LEDs light up when the calibration equals to 29
MHz.
9. Unkey the transmitter. Turn off the power to the transmitter and the tuner.
10. Secure the cover back onto the tuner.
© 2006-2010 MFJ Enterprises, Inc.
19
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
SWR Bridge Calibration
To calibrate the SWR Bridge, you will need a transmitter capable of 100 watts output, a precise calibrated
wattmeter, a 50-ohm dummy load, three 50-ohm SO-239 coax cables, a Phillips screwdriver, a tuning tool
or small flat blade screwdriver, and a cross-needle wattmeter (available only at MFJ factory). Therefore,
this calibration can only be done at MFJ factory.
WARNING: Do not touch anything inside the tuner during operation! Serious, painful RF
burns can result.
WARNING: Never operate the MFJ-925 with its cover removed; dangerous voltages and
currents can be present during operation. Never exceed tuner specifications.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
20
Turn off the power to the transmitter and the tuner.
Remove the cover from the tuner (10 screws) with a Phillips screwdriver.
Connect the cross-needle wattmeter to header HD1, located behind the front panel circuit board.
Connect the 50-ohm dummy load to the ANTENNA connector; connect the wattmeter between
the transmitter and the TRANSMITTER connector on the tuner.
Turn on the power to the transmitter. Using a frequency in the middle of the HF band, such as
7.253 MHz, for calibration is recommended.
Press and hold only the [ALT] button while turning the power on. Both LEDs will blink until the
button is released.
Within four seconds of releasing [ALT], press the [TUNE] button seven times.
After releasing [TUNE] for four seconds, the cross-needle wattmeter shows 100 watts forward
and 20 watts reflected and the SWR Bridge Calibration is initiated.
Make sure the cross-needle wattmeter reads 100 watts forward and 20 watts reflected. If not,
calibrate the cross-needle wattmeter.
Press the [TUNE] button and both meter needles drop to 0 watt marks.
Key the transmitter to output 100 watts and adjust trimmer capacitor VC1 (located in front of the
TRANSMITTER connector) for minimum reflected power. Notice the reflected meter movement
is exaggerated for easier calibration.
Key the transmitter to output 100 watts and adjust the FWD trimpot VR1 (located next to the
RADIO INTERFACE connector) until the forward meter shows 100 watts.
Press the [TUNE] button and the reflected meter goes to full scale.
Turn off the transmitter and reverse the ANTENNA and TRANSMITTER connections; that is,
connect the 50-ohm dummy load to the TRANSMITTER connector and connect the
transmitter/wattmeter to the ANTENNA connector.
Turn on the transmitter’s power.
Key the transmitter to output 100 watts and adjust the REF trimpot VR2 (located next to the
RADIO INTERFACE connector) until the forward meter (yes, the forward meter) shows 100
watts; the reflected meter is at full scale.
Press the [TUNE] button to end calibration.
Turn off the power to the transmitter and the tuner.
Remove the cross-needle wattmeter from header HD1.
Remove the transmitter/wattmeter and the 50-ohm dummy load from the tuner.
Secure the cover back onto the tuner.
Connect your transmitter to the TRANSMITTER connector and connect your antenna to the
ANTENNA connector on the tuner.
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Alinco Radio Interface
The MFJ-5114A radio interface allows users of EDX-2 compatible Alinco transceivers to connect to the
MFJ-925 IntelliTuner™ Automatic Antenna Tuner. With this interface, control signals are connected
between the radio and the tuner. The operator can then control the tuner with a single push of the
[TUNE] button on the front panel of the radio. Supported Alinco radios are DX-70, DX-77, DX-701,
DX-801, and any Alinco radio that supports the Alinco EDX-2 tuner.
Connections
1. Turn the tuner off. Set jumper JP2 to the “I” position.
2. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
3. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
4. Connect the 5-pin molex connector to the mating 5-pin molex connector, marked as ACC, on the
back of the Alinco radio.
5. Push the [POWER] button on the tuner to the in position and then power on the radio.
Operation
The operation of the MFJ-5114A radio interface is similar to the operation of the EDX-2 described in the
Alinco operating manual.
1. Push the [TUNE] button on the radio to initiate automatic tuning process; for DX-70 press
[FUNC] then [TUNE]. The radio will automatically switch to CW mode, transmit a 10-watt
carrier, and start the tuning process. “TUNE” appears in the radio’s LCD while tuning; do not
change the frequency or mode while tuning. When the tuning process is completed, the radio will
stop transmitting, return to its previous mode and power setting; “TUNE” disappears.
Note the [TUNE] button on the tuner will also key the Alinco radio interface.
© 2006-2010 MFJ Enterprises, Inc.
21
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Icom Radio Interface
The MFJ-5114I radio interface allows users of AH-3 or AH-4 compatible Icom transceivers to connect to
the MFJ-925 IntelliTuner™ Automatic Antenna Tuner. With this interface, control signals are connected
between the radio and the tuner. The operator can then control the tuner with a single push of the
[TUNER] button on the front panel of the radio. Supported Icom radios are IC-706, IC-707, IC-718, IC725, IC-728, IC-736, IC-738, IC-746, IC-756, IC-7000, and any Icom radio that supports the Icom AH-3
or AH-4 tuner.
Connections
1. Turn the tuner off. Set jumper JP2 to the “I” position.
2. For IC-7000, make sure jumper JP4 inside the MFJ-925 is removed.
3. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
4. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
5. Connect the 4-pin molex connector to the mating 4-pin molex connector, marked as TUNER, on
the back of the Icom radio.
6. Push the [POWER] button on the tuner to the in position and then power on the radio.
7. Some Icom radios, such as the IC-706, automatically check to see if an external antenna tuner is
connected during power on. For other Icom radios, such as the IC-718, the Tuner Type menu in
the radio menu system must be enabled. Refer to your radio’s operating manual for accessing the
menu system and preparing the AH-4 antenna tuner operation. Use IC-718 as an example:
a. Push [PWR] for 1 second to turn power off.
b. While pushing and holding [SET], push [PWR] to turn power on.
c. Push [UP] or [DN] one or more times to select TUNER.
d. Rotate the Main Dial to select “4” for AH-4 antenna tuner.
e. Push [PWR] for 1 second to turn power off.
f.
Push [PWR] to turn power on again.
Operation
The operation of the MFJ-5114I radio interface is similar to the operation of the AH-3 or AH-4 described
in the Icom radio’s operating manual.
1. Push and hold the [TUNER] button on the radio for one or two seconds to initiate automatic
tuning process. The radio will automatically switch to CW mode, transmit a 10-watt carrier, and
start the tuning process. When the tuning process is completed, the radio will stop transmitting,
return to its previous mode and power setting.
2. Push the [TUNER] button on the radio quickly to bypass the tuner or to cancel tuning in progress.
Note the [TUNE] button on the tuner will also key the Icom radio interface.
22
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Kenwood Radio Interface
The MFJ-5114K radio interface allows users of AT-300 compatible Kenwood transceivers to connect to
the MFJ-925 IntelliTuner™ Automatic Antenna Tuner. With this interface, control signals are connected
between the radio and the tuner. The operator can then control the tuner with a single push of the [AT
TUNE] button on the front panel of the radio. Supported Kenwood radios are TS-50S, TS-450S, TS480HX, TS-570S, TS-690S, TS-850S, TS-870S, TS-2000, and any Kenwood radio that supports the
Kenwood AT-300 tuner.
Note:
The TS-480HX will automatically reduce its TX power to 100 watts maximum (25 watts AM)
when the radio interface is used.
Connections
1. Turn the tuner off. Set jumper JP2 to the “K” position.
2. Make sure jumper JP4 inside the MFJ-925 is installed.
3. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
4. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
5. Connect the 6-pin molex connector to the mating 6-pin molex connector, marked as AT or ACC,
on the back of the Kenwood radio.
6. Push the [POWER] button on the tuner to the in position and then power on the radio.
7. Some Kenwood radios automatically check to see if an external antenna tuner is connected during
power on. For other Kenwood radios, such as the TS-450S and the TS-690S, the External
Antenna Tuner menu in the radio menu system must be enabled. Refer to your radio’s operating
manual for accessing the menu system and preparing the AT-300 external antenna tuner
operation. Use TS-450S and TS-690S as an example:
a. Press and hold the [ENT] key while turning the power on.
b. Rotate the [M.CH/VFO CH] control to select menu number 01 on the display.
c. Press the [UP] or [DOWN] key to change the setting to “ON.”
d. Press the [CLR] key to return to normal operation.
Operation
The operation of the MFJ-5114K radio interface is similar to the operation of the AT-300 described in the
Kenwood radio’s operating manual.
1. Press and hold the [AT TUNE] button on the radio for one second to initiate automatic tuning
process. The radio will automatically switch to CW mode, transmit a 10-watt carrier, and start
the tuning process. When the tuning process is completed, the radio will stop transmitting, return
to its previous mode and power setting.
2. Press the [AT TUNE] button on the radio quickly to bypass the tuner (some Kenwood radios,
such as the TS-690S, do not have this bypass function) or to cancel tuning in progress.
Note the [TUNE] button on the tuner will not operate the Kenwood radio interface.
© 2006-2010 MFJ Enterprises, Inc.
23
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Yaesu Radio Interface/MFJ-5114Y
The MFJ-5114Y radio interface allows users of FC-30 compatible Yaesu transceivers to connect to the
MFJ-925 IntelliTuner™ Automatic Antenna Tuners. With this interface, control signals are connected
between the radio and the tuner. The operator can then control the tuner with a single push of the
(TUNE) key on the front panel of the radio. Supported Yaesu radios are FT-100, FT-450, FT-857, FT897, FT-950, and any Yaesu radio that supports the Yaesu FC-30 tuner.
Connections for FT-100
1. Turn the tuner off. Set jumper JP2 to the “Y” position.
2. Make sure jumper JP4 inside the MFJ-925 is installed.
3. Before connecting the MFJ-5114Y to your radio, follow the instructions in the radio’s manual for
installing the FC-20 automatic antenna tuner.
a. Press and hold the [FUNC] key for ½ second to activate the Menu mode.
b. Rotate the [SELECT] knob to recall Menu #61 [TUNER/ATAS], and then rotate the Main
Dial to change the setting to “tunEr.”
c. Press the [FUNC] key momentarily to save the new setting and exit to normal operation.
d. Turn the FT-100’s power off, then on again, to re-initialize the radio regarding the tuner
status.
4. Turn the radio off. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
5. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
6. Connect the 8-pin mini DIN connector to the mating 8-pin mini DIN connector at the end of the
BAND DATA cable pigtail on the back of the radio.
7. Push the [POWER] button on the tuner to the in position and then power on the radio.
Operation for FT-100
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-20 described in the
Yaesu radio’s operating manual.
1. Press the [FUNC] key, as needed, to recall Operating Function Row 7 [MTR, TUN, PRO, VOX].
2. Press the [B](TUN) key on the radio for ½ second to turn the external tuner function on; the
“TUN” icon will appear bolded in the radio’s display.
3. Press and hold the [B](TUN) key on the radio to begin automatic tuning. The radio will
automatically transmit a low-power carrier and start the tuning process. Press the [B](TUN) key
again to cancel tuning in progress. When tuning is completed, the radio will stop transmitting and
you will be ready for operation on this frequency.
Note the [TUNE] button on the tuner will not operate the MFJ-5114Y Yaesu radio interface.
24
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Connections for FT-450
1. Turn the tuner off. Set jumper JP2 to the “Y” position.
2. Make sure jumper JP4 inside the MFJ-925 is installed.
3. Before connecting the MFJ-5114Y to your radio, follow the instructions in the radio’s manual for
installing the FC-30/-40 automatic antenna tuner.
a. Press and hold the [F] button for one second to enter the Menu mode. The “MENU” icon
will appear in the display.
b. Rotate the [DSP/SEL] knob to select Menu item [TUNER (TUNER/ATAS)].
c. Press the [DSP/SEL] knob to enable this selected Menu item.
d. Rotate the [DSP/SEL] knob to change the setting to “EXT ATU.”
e. Press and hold the [F] button for one second to save the new setting and exit to normal
operation.
4. Turn the radio off. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
5. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
6. Connect the 8-pin mini DIN connector to the mating 8-pin mini DIN connector, marked as
TUNER, on the back of the radio.
7. Push the [POWER] button on the tuner to the in position and then power on the radio.
Operation for FT-450
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-30/-40 described in
the Yaesu radio’s operating manual.
1. Press the (TUNE) button on the radio briefly to enable the external tuner function. The
“TUNER” icon will appear in the radio’s display. If the radio frequency is out of the amateur
band, the “TUNER” icon will not appear.
2. Press and hold the (TUNE) button on the radio for one second to begin automatic tuning. The
radio will automatically transmit a low-power carrier and start the tuning process. The “TUNER”
icon will blink while tuning is in progress. Press and hold the (TUNE) button on the radio for one
second while tuning is in progress to cancel the automatic tuning.
3. When tuning is completed, the radio will stop transmitting and you will be ready for operation on
this frequency.
Note the [TUNE] button on the tuner will not operate the MFJ-5114Y Yaesu radio interface.
© 2006-2010 MFJ Enterprises, Inc.
25
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Connections for FT-857 or FT-897
1. Turn the tuner off. Set jumper JP2 to the “Y” position.
2. Make sure jumper JP4 inside the MFJ-925 is installed.
3. Before connecting the MFJ-5114Y to your radio, follow the instructions in the radio’s manual for
installing the FC-30 automatic antenna tuner. For the following, use the [FUNC] key and the
[SELECT] knob on the FT-857, or use the [F] key and the [MEM/VFO CH] knob on the FT-897.
a. Press and hold the [FUNC] or [F] key for one second to activate the Menu mode.
b. Rotate the [SELECT] or [MEM/VFO CH] knob to recall Menu Mode #001 [EXT MENU],
and then rotate the Main Dial to change the setting to “ON” to enable extended Menu Mode.
c. Rotate the [SELECT] or [MEM/VFO CH] knob to recall Menu Mode #020 [CAT/LIN/TUN],
and then rotate the Main Dial to change the setting to “TUNER.”
d. Press and hold the [FUNC] or [F] key for one second to save the new setting and exit to
normal operation.
e. Turn the radio off, then on again. Do not connect the MFJ-5114Y before changing the Menu
Mode #020 [CAT/LIN/TUN].
f.
Press and hold the [FUNC] or [F] key for one second to activate the Menu mode.
g. Rotate the [SELECT] or [MEM/VFO CH] knob to recall Menu Mode #085 [TUNER/ATAS],
and then rotate the Main Dial to change the setting to “TUNER.”
h. Press and hold the [FUNC] or [F] key for one second to save the new settings and exit to
normal operation.
4. Turn the radio off. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
5. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
6. Connect the 8-pin mini DIN connector to the mating 8-pin mini DIN connector, marked as
CAT/LINEAR, on the back of the radio.
7. Push the [POWER] button on the tuner to the in position and then power on the radio.
Operation for FT-857 or FT-897
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-30 described in the
Yaesu radio’s operating manual.
1. Press the [FUNC] or [F] key, then rotate the [SELECT] or [MEM/VFO CH] knob to recall Multi
Function Row “k” [TUNE, DOWN, UP].
2. Press the [A](TUNE) key on the radio to turn the external tuner function on; the “TUNE” or
“TUNR” icon will appear in the radio’s display.
3. Press and hold the [A](TUNE) key on the radio to begin automatic tuning. The radio will
automatically transmit a low-power carrier and start the tuning process. Press the [A](TUNE)
key again to cancel tuning in progress. When tuning is completed, the radio will stop transmitting
and you will be ready for operation on this frequency.
Note the [TUNE] button on the tuner will not operate the MFJ-5114Y Yaesu radio interface.
26
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Connections for FT-950
1. Turn the tuner off. Set jumper JP2 to the “Y” position.
2. Make sure jumper JP4 inside the MFJ-925 is installed.
3. Before connecting the MFJ-5114Y to your radio, follow the instructions in the radio’s manual for
installing the FC-40 automatic antenna tuner.
a. Press the [MENU] button momentarily to enter the Menu mode.
b. Rotate the [SELECT] knob to select Menu item [110 TGEN EXT TUN]. Press the
[SELECT] knob momentarily to toggle the display between [110 TGEN] and [EXT TUN].
c. Rotate the [CLAR/VFO-B] knob to change the setting to “Etu” to enable the External Tuner.
d. Press and hold the [MENU] button for one second to save the new setting and exit to normal
operation. If you only momentarily press the [MENU] button, the new setting will not be
retained.
4. Turn the radio off. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
5. Important: Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
6. Connect the 8-pin mini DIN connector to the mating 8-pin mini DIN connector, marked as
TUNER, on the back of the radio.
7. Push the [POWER] button on the tuner to the in position and then power on the radio.
Operation for FT-950
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-40 described in the
Yaesu radio’s operating manual.
1. Press the (TUNE) button on the radio briefly to enable the external tuner function.
“TUNER” icon will appear in the radio’s display.
The
2. Press and hold the (TUNE) button on the radio for one second to begin automatic tuning. The
radio will automatically transmit a low-power carrier and start the tuning process. The “TUNER”
icon will blink while tuning is in progress. Press the (TUNE) button on the radio while tuning is
in progress to cancel the automatic tuning.
Note:
The FT-950 will not start automatic tuning when the SWR is greater than
approximately 5:1, indicated by both “TUNER” and “HI-SWR” icons blinking once
when the (TUNE) button on the radio is pressed and held for one second.
3. When tuning is completed, the radio will stop transmitting and you will be ready for operation on
this frequency.
Note the [TUNE] button on the tuner will not operate the MFJ-5114Y Yaesu radio interface.
© 2006-2010 MFJ Enterprises, Inc.
27
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Yaesu Radio Interface/MFJ-5114Y3
The MFJ-5114Y3 radio interface allows users of Yaesu FT-1000MP series, FT-2000 series, and FTDX9000 series transceivers to connect to the MFJ-925 IntelliTuner™ Automatic Antenna Tuner. With this
interface, control signals are connected between the radio and the tuner. With this cable the operator can
control the tuner and radio with a single push of the [TUNE] button on the front panel of the MFJ-925.
Connections for FT-1000MP series of radios
1. Turn the tuner off. Set jumper JP2 to the “I” position.
2. Before connecting the MFJ-5114Y3 to your radio, set the maximum TUNE power of the radio as
follows:
a. On your transceiver, enter the Menu mode by pressing and holding the [FAST] key and then
pressing [ENT].
b. Rotate the [MEM/VFO CH] knob until you see menu 4-3 on the transceiver’s CH display.
c. Rotate the [MAIN VFO] knob to select 50 for 100-watt radios (FT-1000MP/MP Field) or 75
for the FT-1000MP MKV when an amplifier will be used. This gives the best SWR
accuracy, which may be important for solid-state amplifiers. When an amplifier is not used,
the setting can be set at 10 for all transceivers.
d. Press [ENT] to exit the Menu mode.
3. Insert the 8-pin modular plug into the MFJ-925 RADIO INTERFACE jack.
4. Connect the 3.5-mm mono plug on the MFJ-5114Y3 to the REMOTE jack on the rear panel of
the transceiver.
5. Connect a 12V 750 mA DC source to the MFJ-925.
6. Push the [POWER] button on the MFJ-925 to the in position. The radio may be powered on
either before or after the tuner is powered on.
Operation for FT-1000MP series of radios
The transceiver is controlled by the MFJ-925. To operate:
1. Press the [TUNE] button on the MFJ-925 for ½-2 seconds to initiate the tuning process. The
radio will automatically transmit a low-power carrier and start the tuning process. When tuning is
completed, the radio will stop transmitting and you will be ready for operation on this frequency.
Connections for FT-2000 series of radios
1. Turn the tuner off. Set jumper JP2 to the “I” position.
2. Before connecting the MFJ-5114Y3 to your radio, set the maximum TUNE power of the radio as
follows:
a. On your transceiver, enter the Menu mode by pressing the [MENU] key momentarily.
b. Rotate the Main Tuning Dial knob until you see menu item [145 tGEn TUN PWR] on the
transceiver’s display.
28
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
c. Rotate the [SUB VFO-B] knob to select 20 watts for best SWR accuracy. For the FT-2000D,
we recommend that this be set to 50 watts if the user normally operates at 100 watts output
power (when power is turned down to 100 watts, the TUNE power will reduce to 25 watts).
If the operator normally has his FT-2000D set for the full 200 watts, then this should be set to
20 watts.
d. Press and hold in the [MENU] key for two seconds to save the new setting and exit to normal
operation. If you press the [MENU] key momentarily, the new setting will not be saved.
3. Insert the 8-pin modular plug into the MFJ-925 RADIO INTERFACE jack.
4. Connect the 3.5-mm mono plug on the MFJ-5114Y3 to the REM (REMOTE) jack on the rear
panel of the transceiver.
5. Connect a 12V 750 mA DC source to the MFJ-925.
6. Push the [POWER] button on the MFJ-925 to the in position. The radio may be powered on
either before or after the tuner is powered on.
Operation for FT-2000 series of radios
The transceiver is controlled by the MFJ-925. To operate:
1. Press the [TUNE] button on the MFJ-925 for ½-2 seconds to initiate the tuning process. The
radio will automatically transmit a low-power carrier and start the tuning process. When tuning is
completed, the radio will stop transmitting and you will be ready for operation on this frequency.
Connections for FTDX-9000 series of radios
1. Turn the tuner off. Set jumper JP2 to the “I” position.
2. Before connecting the MFJ-5114Y3 to your radio, set the maximum TUNE power of the radio as
follows:
a. On your transceiver, enter the Menu mode by pressing the [MNU] key momentarily.
b. Rotate the Main Tuning Dial knob until you see menu item [157 EXT AMP TUNING PWR]
on the transceiver’s display.
c. Rotate the [CLAR/VFO-B] knob to select 50 watts for best SWR accuracy. The TUNE
power varies with the output power level control setting, so ensure that the TUNE power is
somewhere between 20-50 watts.
d. Press and hold in the [MNU] key for two seconds to save the new setting and exit to normal
operation. If you press the [MNU] key momentarily, the new setting will not be saved.
3. Insert the 8-pin modular plug into the MFJ-925 RADIO INTERFACE jack.
4. Connect the 3.5-mm mono plug on the MFJ-5114Y3 to the REMOTE jack on the rear panel of
the transceiver.
5. Connect a 12V 750 mA DC source to the MFJ-925.
6. Push the [POWER] button on the MFJ-925 to the in position. The radio may be powered on
either before or after the tuner is powered on.
© 2006-2010 MFJ Enterprises, Inc.
29
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
Operation for FTDX-9000 series of radios
The transceiver is controlled by the MFJ-925. To operate:
1. Press the [TUNE] button on the MFJ-925 for ½-2 seconds to initiate the tuning process. The
radio will automatically transmit a low-power carrier and start the tuning process. When tuning is
completed, the radio will stop transmitting and you will be ready for operation on this frequency.
Yaesu Radio Interface/MFJ-5114Y4
The FT-2000 series radio has a TX REQ input on the back that can be used in lieu of the REM
(REMOTE) input. If this option is chosen, you must use the MFJ-5114Y4 radio interface cable. With
this interface, control signals are connected between the radio and the tuner. With this cable the operator
can control the tuner and radio with a single push of the [TUNE] button on the front panel of the MFJ925.
Connections for FT-2000 series of radios
1. Turn the tuner off. Set jumper JP2 to the “I” position.
2. Before connecting the MFJ-5114Y4 to your radio, set the maximum TUNE power of the radio as
follows:
a. On your transceiver, enter the Menu mode by pressing the [MENU] key momentarily.
b. Rotate the Main Tuning Dial knob until you see menu item [145 tGEn TUN PWR] on the
transceiver’s display.
c. Rotate the [SUB VFO-B] knob to select 20 watts for best SWR accuracy. For the FT-2000D,
we recommend that this be set to 50 watts if the user normally operates at 100 watts output
power (when power is turned down to 100 watts, the TUNE power will reduce to 25 watts).
If the operator normally has his FT-2000D set for the full 200 watts, then this should be set to
20 watts.
d. Press and hold in the [MENU] key for two seconds to save the new setting and exit to normal
operation. If you press the [MENU] key momentarily, the new setting will not be saved.
3. Insert the 8-pin modular plug into the MFJ-925 RADIO INTERFACE jack.
4. Connect the RCA plug on the MFJ-5114Y4 to the TX REQ jack on the rear panel of the
transceiver.
5. Connect a 12V 750 mA DC source to the MFJ-925.
6. Push the [POWER] button on the MFJ-925 to the in position. The radio may be powered on
either before or after the tuner is powered on.
Operation for FT-2000 series of radios
The transceiver is controlled by the MFJ-925. To operate:
1. Press the [TUNE] button on the MFJ-925 for ½-2 seconds to initiate the tuning process. The
radio will automatically transmit a low-power carrier and start the tuning process. When tuning is
completed, the radio will stop transmitting and you will be ready for operation on this frequency.
30
© 2006-2010 MFJ Enterprises, Inc.
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
In Case of Difficulty
If the tuner acts erratic, reset the tuner to factory defaults.
If the tuner fails to tune, please double check all connections and follow the tuning procedures again. Be
sure you are using enough inductance (through manual adjustment) and minimum capacitance.
If the tuner arcs at the rated power levels, please double check all connections and follow the tuning
procedures again. Ensure you are not exceeding the tuner’s rated power handling capability. Be sure you
are using the least amount of inductance and the greatest capacitance possible that still allows matching
the load on the operating frequency.
Note:
If the tuner arcs when operating on the 160-meter band, it may be necessary to reduce
transmitter output power.
If you are still unsuccessful, but the tuner does adjust and operate when used with a dummy load or
another antenna, please read “Grounding Hints” and “Antenna System Hints” on page 13.
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.
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, Starkville, MS
39759; by facsimile (FAX) to 662-323-6551; or by email to techinfo@mfjenterprises.com. Send a
complete description of your problem, an explanation of exactly how you are using your unit, and a
complete description of your station. Also include the firmware version number of your unit.
List of Accessories
•
•
•
•
•
•
•
•
•
•
•
•
MFJ-1316:
MFJ-4116:
MFJ-4117
MFJ-5114A:
MFJ-5114I:
MFJ-5114K:
MFJ-5114Y:
MFJ-5114Y3:
MFJ-5114Y4:
MFJ-5803:
MFJ-5806:
MFJ-5818:
12 VDC 1.5 amp power supply
BiasTee DC power injector
BiasTee DC power injector with ON/OFF switch
Interface cable for compatible Alinco radios
Interface cable for compatible Icom radios
Interface cable for compatible Kenwood radios
Interface cable for Yaesu FT-100, FT-450, FT-857, FT-897, and FT-950
Interface cable for Yaesu FT-1000MP series, FT-2000 series, and FTDX-9000 series
Interface cable for Yaesu FT-2000 series (use TX REQ input instead of REM input)
3’ RG-58 50-ohm coax cable with PL-259 connectors on each end (tuner input only)
6’ RG-58 50-ohm coax cable with PL-259 connectors on each end (tuner input only)
18’ RG-58 50-ohm coax cable with PL-259 connectors on each end (tuner input only)
© 2006-2010 MFJ Enterprises, Inc.
31
32
Ground
Antenna
Capacitors
0-3900 pF
Z
Inductors
0-24 uH
LEDs
User Interface
Push
Buttons
Microcontroller
Frequency
Counter
Figure 13. MFJ-925 Circuit Block Diagram.
Memory
Relay
Drivers
Impedance
Sensor
Buzzer
SWR
Sensor
RF
Radio
Interface
Voltage
Regulator
DC
Bias
Tee
Transmitter
MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
© 2006-2010 MFJ Enterprises, Inc.
LIMITED 12 MONTH WARRANTY
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.
1.
The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit card or
money order receipt, etc.) describing the product to establish the validity of the warranty claim and
submit the original or machine reproduction of such proof of purchase to MFJ Enterprises, Inc. at
the time of warranty service. MFJ Enterprises, Inc. shall have the discretion to deny warranty
without dated proof-of-purchase. Any evidence of alteration, erasure, or forgery shall be cause to
void any and all warranty terms immediately.
2.
MFJ Enterprises, Inc. agrees to repair or replace at MFJ's option without charge to the original
owner any defective product under warrantee provided the product is returned postage prepaid to
MFJ Enterprises, Inc. with a personal check, cashiers check, or money order for $10.00 covering
postage and handling.
3.
This warranty is NOT void for owners who attempt to repair defective units. Technical
consultation is available by calling the Service Department at 662-323-0549 or the MFJ Factory at
662-323-5869.
4.
This warranty does not apply to kits sold by or manufactured by MFJ Enterprises, Inc.
5.
Wired and tested PC board products are covered by this warranty provided only the wired and
tested PC board product is returned. Wired and tested PC boards installed in the owner's
cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises, Inc. will be
returned at the owner's expense unrepaired.
6.
Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to person or
property by the use of any MFJ products.
7.
Out-of-Warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty product
provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner. Repair
charges will be added to the COD fee unless other arrangements are made.
8.
This warranty is given in lieu of any other warranty expressed or implied.
9.
MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or
manufacture without incurring any obligation to install such changes upon any of the products
previously manufactured.
10.
All MFJ products to be serviced in-warranty or out-of-warranty should be addressed to:
MFJ Enterprises, Inc.
300 Industrial Park Road
Starkville, Mississippi 39759 USA
and must be accompanied by a letter describing the problem in detail along with a copy of your
dated proof-of-purchase.
11.
This warranty gives you specific rights, and you may also have other rights which vary from state
to state.
MFJ ENTERPRISES, INC.
300 Industrial Park Road
Starkville, MS 39759
MFJ-925 Manual
Version 1A
Printed In U.S.A. 02/2010