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MFJ-926B HF Automatic Remote Antenna Tuner 

Instruction Manual 

 2010 MFJ Enterprises, Inc. 

3

 

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 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 (2-10 watts).  Apply maximum power only after tuning up. 

●

 

Never

 exceed tuner specifications. 

●

 

Do 

not

 transmit with a high SWR for extended periods of time. 

 

 

1.  Connect  the  transmitter  to  the 

“RF  IN/OUT”

  coaxial  connector  on  the 

MFJ-4117  Bias-Tee

 

using a 50-ohm coaxial cable. (See Figure 1)  This is the RF signal input connector. 

 
2.  Connect  a  12-15  VDC  voltage  source  capable  of  supplying  at  least  750  milli-amps  to  the  “

DC 

IN\OUT” 

jack on the 

MFJ-4117 Bias-Tee.  

This is your DC voltage input connector. 

 
3.  Connect  the 

“RF/DC  OUT/IN” 

coaxial  connector  on  the 

MFJ-4117  Bias-Tee 

to  the 

TRANSMITTER 

connector  on  the 

MFJ-926B  Intellituner

  using  50-ohm  coaxial  cable.  The 

MFJ-926B Intellituner

 will recover the RF and DC signals.  

 

4.  Connect  your  coax-fed  antenna  to  the 

ANTENNA

  connector  using  a  50-ohm  coaxial  cable,  or 

connect your random wire to the 

WIRE

 binding post. 

 
5.  Connect your ground connection to the

 GROUND

 post. 

 

6.  Key your transmitter to output a carrier of 2-10 watts CW, FM or AM.  The SWR should be auto-

tuned to less than 1.5:1.  This can be verified with an external SWR meter if desired. 

 

7.  You are now ready to transmit at 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 is normal.  Do not be alarmed. 

 

 

 

 

 

 

 

 
 
 
 

Figure 1:

  MFJ-926B and MFJ-4117 Installation Block Diagram 

 

 

Note: 

To use the Random WIRE binding post, make sure to remove the antenna, if any, from 
the ANTENNA connector. 

 

MFJ-4117 

Bias Tee 

 

MFJ-926B 

Intellituner 

12-15 

VDC 
input 

 

1.8-30 MHz 

RF 

input 

DC / RF 

ANTENNA 

    

 

    OR 

RANDOM 
WIRE 

Содержание MFJ-926B

Страница 1: ...TION 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 C OPYR IGHT 2010 M FJ ENTERPR ISES IN C C Model MFJ 926B VERSION 1A ...

Страница 2: ... Button 5 Connections 5 Transmitter 5 Antenna 5 Ground 5 Wire 5 Installation 6 MISCELLANEOUS Antenna Memory 7 IntelliTuneTM Algorithm 7 LC Limits 7 Morse Code and Flashes 8 Foldback Circuit 8 Grounding Hints 9 Antenna System Hints 9 Location 9 Matching Problems 9 APPENDICES Resetting the Tuner 11 Factory Defaults 11 Delete Entire Antenna Memory 12 Delete Antenna Memory Bank 12 Total Reset 12 Self ...

Страница 3: ... iii SWR Bridge Calibration 15 In Case of Difficulty 16 Technical Assistance 17 List of Accessories 17 Limited Warranty 19 FIGURES Figure 1 Installation Block Diagram 3 Figure 2 Power On Operations 11 TABLES Table 1 Memory Resolution 7 Table 2 Tuner Flashes 8 Table 3 Failure Messages 13 ...

Страница 4: ...ers the frequency and tuner settings safely stored in non volatile memory The next time you operate on that frequency or close to it the MFJ 926B tuner settings are instantly restored and you re ready to operate in milliseconds 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...

Страница 5: ...ange 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 foldback 20 watts without foldback RF power limit 200 watts SSB CW Frequency range 1 8 to 30 MHz continuous coverage Capacitance range 0 to 3961 pF nominal 256 values Inductance range 0 to 24 86 µH nominal 256 values Relay rating 10 amp ...

Страница 6: ...FJ 4117 Bias Tee This is your DC voltage input connector 3 Connect the RF DC OUT IN coaxial connector on the MFJ 4117 Bias Tee to the TRANSMITTER connector on the MFJ 926B Intellituner using 50 ohm coaxial cable The MFJ 926B Intellituner will recover the RF and DC signals 4 Connect your coax fed antenna to the ANTENNA connector using a 50 ohm coaxial cable or connect your random wire to the WIRE b...

Страница 7: ...e SWR is already below the target SWR of 1 5 pressing TUNE will fine tune the match for a lower SWR if possible When the automatic tuning is completed a series of flashes indicates the tuned SWR where one flash indicates an SWR of 1 5 or less two flashes indicate an SWR of 1 6 to 2 0 three flashes indicate an SWR of 2 1 to 2 5 and four flashes indicate an SWR of 2 6 to 3 0 For SWR above 3 0 SWR di...

Страница 8: ...is in bypass mode and RF from the transmitter goes directly to the antenna with no matching Connections Transmitter SO 239 connector for coax cable from transmitter or transceiver A MFJ 4117 bias tee is connected in line between the transmitter output and this connector This provides 12 volts DC on the coax to power the tuner The MFJ 4117 is included with the MFJ 926B Antenna SO 239 connector for ...

Страница 9: ...on the MFJ 4117 Bias Tee using a 50 ohm coaxial cable See Figure 1 This is the RF signal input connector 4 Connect a 12 15 VDC voltage source capable of supplying at least 750 milli amps to the DC IN OUT jack on the MFJ 4117 Bias Tee This is your DC voltage input connector 5 Connect the RF DC OUT IN coaxial connector on the MFJ 4117 Bias Tee to the TRANSMITTER connector on the MFJ 926B Intellitune...

Страница 10: ...8168 18 15 21000 21450 21 12 24890 24990 25 10 28000 29700 28 Table 1 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 over 2500 memory locations IntelliTuneTM Algorithm When the tuner cannot find an appropriate setting in its memory it begins its calculation function It meas...

Страница 11: ...cates By Two Flashes By Pressing Antenna 1 2 ANT 1 second Memory Bank Bank A 1 Flash Bank B 2 Flashes Bank C 3 Flashes Bank D 4 Flashes Off 5 Flashes ANT 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 Flash SWR 2 0 2 Flashes SWR 2 5 3 Flashes SWR 3 0 4 Flashes SWR 3 0 SWR TUNE for 0 5 to 2 seconds StickyTune On Off TUNE 2 seconds Tuning Mod...

Страница 12: ...often inadequate for RF grounding Ground rods by themselves 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 r...

Страница 13: ...mponent 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 o...

Страница 14: ...quency counter ANT TUNE Press and hold then press 7 times to calibrate the SWR bridge POWER ANT TUNE Press and hold to delete current antenna memory POWER ANT TUNE For the operations not pressing or pressing it more than seven times will cancel the operation after idling four seconds beep two times and then resume normal operation POWER ANT TUNE Figure 2 Power On Operations Resetting the Tuner Eac...

Страница 15: ...on is released 3 Within four seconds of releasing ANT press the TUNE button three times 4 After releasing TUNE for four seconds both antenna memories are deleted and factory defaults are reset The total reset takes approximately six seconds 5 Flash three times and resume normal operation Self Test A self test routine will check the functions of the MFJ 926B This routine checks the LEDs the interna...

Страница 16: ...age Indicates ANT FAIL ANT 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 3 Failure Messages Power Down Circuit Test When the 12 VDC power to the tuner is turned off the tuner saves all s...

Страница 17: ...l the ANT button is released 7 Repeat Steps 5 and 6 to test all 19 relays in the order of relay K1 to K19 8 After releasing ANT on the 19th relay Flash 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 scre...

Страница 18: ...e check all connections and follow the tuning procedures again 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 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 ...

Страница 19: ...ly MFJ 4117 BiasTee DC power injector with on off switch included with the MFJ 926B MFJ 5803 3 feet long RG 58 A U 50 ohm coax cable with a PL 259 connector on each end MFJ 5806 6 feet long RG 58 A U 50 ohm coax cable with a PL 259 connector on each end MFJ 5818 18 feet long RG 58 A U 50 ohm coax cable with a PL 259 connector on each end NOTES ...

Страница 20: ...ng 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 tested PC boards installed in the ...

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