MFJ MFJ-269D Instruction Manual Download Page 36

MFJ-269D Instruction Manual                                                                       LF/HF/VHF/UHF SWR Analyzer 

34 

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.  This is good on all products except antennas and software 
to cover postage and handling for return from in warranty service.  We also take MasterCard, Visa, American 
Express, and Discover credit cards.  Postage and handling may vary according to the weight of the product in 
question.    You  should  specify  what  type  of  delivery  service  you  wish.    We  can  send  by  UPS,  U.S.  Postal 
service or Fedex.  MFJ doesn’t guarantee delivery by US Postal Service. 

3.

 

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

warranty  upon  request, provided the following terms are satisfied. MFJ must receive the original parts you 
wish  to  replace,  your  proof-of-purchase,  and  a  personal  check,  cashiers  check  or  money  order  must  be 
provided  to  cover  postage  and  handling.  Postage  and  handling  may  vary  according  to  the  weight  of  the 
product in question. We also take MasterCard, Visa, American Express and Discover credit cards. 

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 un-repaired.   

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-269D

Page 1: ......

Page 2: ...NERAL CONNECTIONS 6 3 2 POWER UP DISPLAY 7 3 3 MAIN MEASUREMENT MODES LF HF VHF 0 10 230 MHZ 7 3 4 FREQUENCY CONTROL 8 4 0 MAIN OR OPENING MODE 9 4 1 GENERAL CONNECTIONS 9 4 2 ANTENNA SWR AND IMPEDANC...

Page 3: ...NES OR BEVERAGE ANTENNAS 30 7 4 ADJUSTING TUNERS 30 7 5 ADJUSTING AMPLIFIER MATCHING NETWORKS 31 7 6 TESTING RF TRANSFORMERS 31 7 7 TESTING BALUNS 31 7 8 TESTING RF CHOKES 32 8 0 TECHNICAL ASSISTANCE...

Page 4: ...ntennas SWR impedance reactance resistance resonant frequency and bandwidth Antenna tuners SWR bandwidth frequency Amplifiers Input and output matching networks chokes suppressors traps and components...

Page 5: ...interference isn t an issue but occasionally a particularly powerful signal may be picked up by the antenna under test and routed into the analyzer bridge circuit where it conflicts with the internal...

Page 6: ...O ANY POWER SOURCE IMPROPER CONNECTIONS OR INCORRECT VOLTAGES MAY CAUSE DAMAGE TO THIS PRODUCT 2 1 External Power Supply The MFJ 1312D satisfies all external voltage and current power source requireme...

Page 7: ...are depleted charge with the analyzer power switch turned off it may take ten hours or more to fully restore depleted cells Important Warning Never change batteries with the power switch On or with a...

Page 8: ...dby A blinking SLP message in the display screen lower right corner indicates power saving mode see below To pull the unit out of SLP momentarily press either the Mode or Gate button to resume operati...

Page 9: ...wo analog panel meters also activate when the working display comes up 3 3 Main Measurement Modes LF HF VHF 0 10 230 MHz Momentarily pressing or tapping the Mode button after the first working display...

Page 10: ...F and HF bands 0 10 11 0 MHz The Upper Range switch selects 5 HF and VHF bands for 11 230 MHz coverage Note that the Upper Range switch must be set fully clockwise to the Lower Range position for the...

Page 11: ...quality parts and check them for wear oxidation dirt and tight pin contact before proceeding 2 Lead Length Make all connection electrically secure and keep all leads as short as possible This precaut...

Page 12: ...2 wavelength of cable displace the calibration plane by a controlled amount 360 degree phase rotation 2 Electrical Half Wavelengths of Cable Installing a half wavelength of cable between the load and...

Page 13: ...far end of the cable If the SWR is elevated or the Impedance Z fluctuates very much as you tune the analyzer s VFO suspect a defective cable 8 Excessive Transmission Line Loss Your cable may exhibit...

Page 14: ...ta when the measurement accuracy is questionable see examples below Reactance Sign The MFJ 269D measures the DUT s reactance X and mathematically converts it to a capacitance value Xc However the anal...

Page 15: ...r capacitive You can usually confirm the sign by adjusting the VFO If tuning down in frequency decreases reactance the reactance is likely inductive jX because inductors normally exhibit decreased rea...

Page 16: ...ng until you understand its full technical meaning Information Sources A basic understanding of transmission line and antenna behavior and terminology is very important in understanding Advanced Mode...

Page 17: ...nts with the exception of the Frequency Counter mode The Antenna connector supplies about 7 dBm output into 50 ohms 5 volts RMS and appears like a 50 ohm source resistance open circuit voltage 1 volt...

Page 18: ...ode by holding down Mode and Gate switches The opening display first indicates and then flashes to In this mode the LCD displays Frequency Impedance Magnitude Z in ohms and Phase Angle of the Impedanc...

Page 19: ...meter displays the Z in ohms while the SWR meter displays 50 ohm referenced SWR Series Equivalent Impedance display examples 7 1598 MHz 3 2 Rs 50 Xs 62 14 095 MHz 31 Rs Z 1500 sW R sW R In the left h...

Page 20: ...e meter as an analog tuning aid for identifying resonance In this mode the MFJ 269D measures and displays Frequency SWR Resistance Rs and Reactance Xs When reactance equals zero in a system that has s...

Page 21: ...might be very low due to system losses Match efficiency only applies to the loss in power transfer from a perfect 50 ohm fixed tuned source to the input of the feedline or system where the measurement...

Page 22: ...he SWR meter indicates SWR normalized to 50 Ohms and the impedance meter is disabled To use this mode connect the DUT to the Antenna connector adjust Frequency as needed and read the results on the sc...

Page 23: ...rs in other measurements Only SWR and SWR related functions are displayed for the UHF band 5 5 1 Distance to Fault DTF for HF VHF only With Vf entered in the previous function the next function in the...

Page 24: ...o enter the mode press and hold the Mode and Gate buttons until Advanced 2 appears on the screen From other Modes step through the menu holding the Mode and Gate button The first menu that appears is...

Page 25: ...s at the current frequency setting 68 511 Mhz o As you Tune the analyzer frequency the electrical length of the line will be re calculated Note that Electrical Length repeats at 360 degrees and return...

Page 26: ...rogrammed in manually If a length is not programmed in a default length of 100 feet will be selected automatically When changing UHF frequency with a 100 foot line the display rotates through 360 degr...

Page 27: ...ed length in feet of matching sections and phasing lines if you know the required variables velocity factor and electrical degrees The analyzer can also directly measure and display length using the d...

Page 28: ...it in The display will now change to Line length l 78 o Pressing Mode shifts the display to the Velocity Factor adjustment in step 2 5 6 Advanced 3 LF HF VHF only To access this mode press and hold M...

Page 29: ...cle the analyzer back to the Main or to another Advanced mode 6 0 ADJUSTING SIMPLE ANTENNAS Most antennas are adjusted by varying element length and most homemade antennas are simple verticals or dipo...

Page 30: ...o 4 Divide the measured minimum SWR frequency by the desired operating frequency 5 Multiply the present antenna length times the result from Step 4 This will approximate the antenna length you actuall...

Page 31: ...Distance to Fault mode in Advanced 2 see section 5 5 If balanced line is used operate the MFJ 269D only from internal batteries and keep it a few feet away from other conductors or earth Do not attac...

Page 32: ...round the expected value 2 Connect the transmission line or antenna directly to the MFJ 269D Antenna connector Adjust the frequency near the expected operating frequency until the lowest resistance an...

Page 33: ...r s RF matching networks The appropriate network can now be adjusted When the analyzer shows 50 ohms and a 1 1 SWR at the operating frequency with the proper amounts of capacitance to set the system Q...

Page 34: ...voltage balun is operating properly the SWR will be very low with the resistors connected from either output terminal to ground 7 8 Testing RF Chokes Large RF chokes usually have frequencies where the...

Page 35: ...62 323 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 Yo...

Page 36: ...erms are satisfied MFJ must receive the original parts you wish to replace your proof of purchase and a personal check cashiers check or money order must be provided to cover postage and handling Post...

Page 37: ......

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