MFJ MFJ-926B Instruction Manual Download Page 20

 

 

 

 

FULL 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,  of  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  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.

 

MFJ Enterprises, Inc. will supply replacement parts free of charge for any MFJ product 

under  warranty  upon  request.    A  dated  proof  of  purchase  and  a

  $8.00

  personal  check,  cashiers 

check, or money order must be provided 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 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.   

 

7.

  

Under  no  circumstances  is  MFJ  Enterprises,  Inc.  liable  for  consequential  damages  to 

person or property by the use of any MFJ products. 

 

8.

 

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. 

 

9.

 

This warranty is given in lieu of any other warranty expressed or implied. 

 

10.

 

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. 

 

11.

 

All  MFJ  products to be serviced in-warranty or out-of-warranty should be addressed to 

MFJ Enterprises, Inc., 300 Industrial Park Rd, 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 and a telephone number. 

 

12.

 

This warranty gives you specific rights, and you may also have other rights, which vary 

from state to state. 
 

Summary of Contents for MFJ-926B

Page 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 ...

Page 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 ...

Page 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 ...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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 ...

Page 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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