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MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner 

Instruction Manual 

 2006-2015 MFJ Enterprises, Inc. 

1

 

THE BASICS 

 

Introduction 

The MFJ-939 

Plug&Play Intellituner

TM

 a simple to install and convenient antenna tuner for use with Icom, 

Alinco, Kenwood, or Yaesu radios. The MFJ-939 comes complete with interface cable and programmed 
for your particular radio. 

The  MFJ-939 

Plug&Play  IntelliTuner

TM

  lets  you  rapidly  tune  any  unbalanced  or  single-wire  antenna 

automatically. MFJ's exclusive 

InstantRecall

TM

IntelliTune

TM

 and 

AdaptiveSearch

TM

 algorithms give you 

fast  automatic  tuning  with more  than  20,000 non-volatile 

VirtualAntenna

TM

  memories. The  antenna  has 

eight banks of memory; with over 2500 non-volatile memories for tuner settings. 

The tuner includes a highly efficient switching L-network with wide matching capability, 1.8 to 30 MHz 
coverage,  a  radio  interface  port,  and  heavy-duty  10  amp/1000  volt  relays.  It  is  rated  at  200  watts 
SSB/CW. 

A  maximum  of  256  values  of  inductance  and  256  values  of  capacitance  are  available.  With  the 
capacitance  switched  between  the  input  and  output  side,  this  provides  a  total  of  131,072  L/C  tuning 
combinations. The nominal tuning ranges are 0 to 24 µH and 0 to 3900 pF. 

The  MFJ-939 

Plug&Play  IntelliTuner

TM 

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 two sets of four banks of 
memory, which can learn and remember more than 2500 frequencies and tuner settings. A total of 20000 
settings. 

When you key your transmitter, MFJ’s 

InstantRecall

TM

 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 

IntelliTune

TM

  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 

AdaptiveSearch

TM

 

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 

IntelliTuners

TM

,  the  MFJ-939  supports  radio  tuner  interfaces  that  are  compatible  with 

Alinco  EDX-2  tuner,  Icom  AH-3  and  AH-4  tuners,  Kenwood  AT-300  tuner,  Yaesu  FC-30  tuner,  and 
Yaesu FH-1 and FH-2 remote controls.  

When your station radio is upgraded or changed the MFJ-939 can be changed from one radio model to 
another with the optional interface cables MFJ-5114A (for Alinco), MFJ-5114I (for Icom), MFJ-5114K 
(for Kenwood); and MFJ-5114Y/Y3/Y4 (for Yaesu) that are available from MFJ Enterprises, Inc. So as 
the station changes the tuner can change with the station. 

The MFJ-939 tuner enters a “sleep” mode when idle and when no transmit signal is present, turning off 
the microprocessor clock to avoid the generation of spurious signals. 

Содержание Plug&Play Intellituner -939

Страница 1: ......

Страница 2: ...14Y 14 Connections 14 Connections for the FT 100 15 Connections for FT 450 15 Connections for FT 857 or FT 897 15 Connections for FT 950 16 MFJ 939Y3 FT 1000MP FT 2000 FT 9000 18 Operation for FT 1000MP series of radios 18 Operation for FT 2000 series of radios 18 Operation for FTDX 9000 series of radios 18 Yaesu Radio Interface MFJ 5114Y3 18 Connections 18 Connections for FT 1000MP series of radi...

Страница 3: ...gure 1 General Setup 3 Figure 2 MFJ 939 Front Panel 4 Figure 3 Button Action 5 Figure 4 MFJ 939 Back Panel 6 Figure 6 General Setup 8 Figure 7 Icom Interface Cable 9 Figure 8 Kenwood Interface Cable 12 Figure 9 Yaesu Interface Cable FT 100 450 857 897 950 14 Figure 10 Yaesu Interface Cable 1000MP 2000 9000 series 19 Figure 11 Yaesu Interface Cable FT 2000 series 21 Figure 12 Alinco Interface Cable...

Страница 4: ...MFJ 939 Plug Play IntelliTuner Automatic Antenna Tuner Instruction Manual 2006 2015 MFJ Enterprises Inc iv Notes ...

Страница 5: ...emory which can learn and remember more than 2500 frequencies and tuner settings A total of 20000 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 comp...

Страница 6: ... remembering frequency specific matching values Built in radio interface circuitry for compatible radios SO 239 coax fed antenna connector SO 239 coax to single wire adaptor Specifications Impedance matching range 6 to 1600 ohms SWR matching range Up to 8 1 for 50 ohms and up to 32 1 for 50 ohms Minimum power for tuning 2 watts Maximum power while tuning 100 watts with fold back 20 watts without f...

Страница 7: ...gh the supplied adaptor 5 Connect your ground connection to the GROUND post 6 Press the POWER button to turn on the MFJ 939 tuner 7 Press the ALT button momentarily until there is one beep One beep indicates that memory 1 is selected 8 Key your transmitter to output a carrier of 2 20 watts CW FM or AM 9 Press and hold the TUNE button for one second to start the automatic tuning process When comple...

Страница 8: ...tic 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 approximat...

Страница 9: ...TUNE button is pressed or if Automatic or StickyTune is enabled WARNING Do not turn the power on and off rapidly otherwise the tuning setting memory can be corrupted and the unit will have to be reset to factory defaults Note When the tuner power is OFF the tuner is bypassed and RF from the transmitter goes directly to the antenna with no matching Automatic Semi Automatic Tuning Mode Pressing TUNE...

Страница 10: ... 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 The Radio Interface works with radios that are compatible with Alinco EDX 2 Icom AH 3 and AH 4 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 ...

Страница 11: ... high RF voltages These voltages can cause serious RF burns if the terminals are touched when transmitting Be sure to locate the tuner so these terminals cannot accidentally be contacted during operation 2 Install the tuner between the transmitter and the antenna Use a 50 ohm coaxial cable such as RG 58 to connect the transmitter to the connector marked TRANSMITTER on the rear of the tuner See Fig...

Страница 12: ...radio instruction manual for setting up the operation of an external tuner See the Operation Radio Interface and Connection information sections for additional details for the radios listed below As the station changes the tuner can be reconfigured as listed in the Interface section of each model to function with other radios by replacing the interconnect cable and changing jumpers in the tuner Fi...

Страница 13: ...39 Plug Play 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 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...

Страница 14: ...ctor 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 operating manual for...

Страница 15: ...s 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 Radio Interface The MFJ 5114K radio interface allows users of AT 300 compatible Kenwood transceivers to connect to the...

Страница 16: ...ower 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 1 Push the POWER button on the tuner to the in position and then power on the radio 2 Some Kenwood radios automatically check to see if an external antenna tu...

Страница 17: ...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 c...

Страница 18: ...tructions in the radio operations manual on the external tuner use like the FC 20 FC 30 or FC 40 They are similar to the radios listed above Yaesu Radio Interface MFJ 5114Y The MFJ 5114Y radio interface allows users of FC 30 compatible Yaesu transceivers to connect to the MFJ 939 Plug Play IntelliTuner Automatic Antenna Tuners With this interface control signals are connected between the radio and...

Страница 19: ...tail on the back of the radio 7 Push the POWER button on the tuner to the in position and then power on the radio Connections for FT 450 1 Turn the tuner off Set jumper JP2 to the Y position 2 Make sure jumper JP4 inside the MFJ 939 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 ...

Страница 20: ... 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 Conn...

Страница 21: ...he 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 3 When tuning is completed the radio will stop transmitting and you will be ready for operation on this frequency Note the TUNE button o...

Страница 22: ...cy Yaesu Radio Interface MFJ 5114Y3 The MFJ 5114Y3 radio interface allows users of Yaesu FT 1000MP series FT 2000 series and FTDX 9000 series transceivers to connect to the MFJ 939 Plug Play 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 TUN...

Страница 23: ...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 939 6 Push the POWER button on the MFJ 939 to the in position The radio may be powered on either before or after the tuner is powered on 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...

Страница 24: ...ntil 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 ...

Страница 25: ...des TX REQ input 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 939 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 ...

Страница 26: ...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 Jumper Setting JP2 I JP4 Does Not Care Cable MFJ 5114A Table 6 Alinco Press the radio s TUNE button to start the tuning process for DX 70 press FUNC then TUNE Pin 1 Ground connects to pins 4 and 5 of Radio Interface Plug Pin 2 13 8V conn...

Страница 27: ...2000 2 75 80 3500 4000 4 60 5330 5 5346 5 5366 5 5371 5 and 5403 5 5 memory locations 40 7000 7300 7 30 10100 10150 10 20 14000 14350 14 17 18068 18168 18 15 21000 21450 21 12 24890 24990 25 10 28000 29700 28 Table 7 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 primar...

Страница 28: ...Bank C 3 beeps Bank D 4 beeps Off 5 beeps ALT 1 second Bypass Toggle Bypass Mode L 0 and C 0 Restore Last L C Setting TUNE 0 5 sec Tuned SWR SWR 1 5 1 beep SWR 2 0 2 beeps SWR 2 5 3 beeps SWR 3 0 4 beeps SWR 3 0 SWR TUNE for 0 5 to 2 seconds StickyTune On Off TUNE 2 seconds Tuning Mode Automatic Semi Automatic TUNE ALT Table 8 Tuner Beeps TRANSCEIVER FOLDBACK Modern transceivers with solid state f...

Страница 29: ...nd 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 Loc...

Страница 30: ...n 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 br...

Страница 31: ...mes and then resume normal operation POWER ALT TUNE Figure 13 Power On Operations Resetting the Tuner Each time the tuner is powered off the microprocessor saves all memories and configurations to non volatile 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 ...

Страница 32: ...n 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 releasi...

Страница 33: ...and the red LED will blink 13 Turn the power off Failure Message Indicates ANT FAIL ALT button is shorted or improperly connected TUNE FAIL TUNE button is shorted or improperly connected MEMORY FAIL Non volatile memory circuitry is improperly connected WAKEUP FAIL Microprocessor wakeup circuitry problem PD FAIL Power down circuitry problem Table 9 Failure Messages Power Down Circuit Test When the ...

Страница 34: ...der 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 Frequency Counter Calibration To calibrate the frequency counter you will need a transmitter a 50 ohm dummy load two 50 ohm SO 239 coax cables a Phillips screwdriver and a tuning tool or small flat blade screwdriver WARNING Do not touch anyth...

Страница 35: ...ing a frequency in the middle of the HF band such as 7 253 MHz for calibration is recommended 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 seven times 8 After releasing TUNE for four seconds the cross needle wattmeter shows 100 watts forward and 20 watts reflected and t...

Страница 36: ...dio can not supply the needed power Jumper JP1 Function 0 Disconnects power from the interface cable 1 Connects power from the interface cable Table 10 Jumper JP1 Setting Jumper JP2 is used to set the MFJ 939 to the radio model in use Note that no jumper disables the radio interface Jumper JP2 To Interface Using Cable 0 No Radio Interface I Alinco Icom Yaesu FT 1000MP FT 2000 FT 9000 Yaesu FT 2000...

Страница 37: ...oblem 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 ...

Страница 38: ...MFJ Enterprises Inc 34 Transmitter Radio Interface Impedance Sensor SWR Sensor Frequency Counter Memory Microcontroller Relay Drivers Ground Antenna Inductors 0 24 uH Capacitors 0 3900 pF Push Buttons LEDs Buzzer User Interface Z Bias Tee RF Voltage Regulator DC Figure 14 Block Diagram ...

Страница 39: ...vided to cover postage and handling 4 This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling 662 323 5869 5 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 6 Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned Wired and t...

Страница 40: ...MFJ 939 Manual Version 0A Printed In U S A 300 Industrial Park Road Starkville MS 39759 MFJ ENTERPRISES INC ...

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