MFJ Differential-T Tuner -986 Скачать руководство пользователя страница 15

 MFJ-986Differential-TTuner                                                                                                                     Instruction Manual 

15 

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 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. 
 
 
 

Содержание Differential-T Tuner -986

Страница 1: ... Before Operating Equipment COPYRIGHT 2013 MFJ ENTERPRISES INC C VERSION 7A MFJ ENTERPRISES INC 300 Industrial Park Road Starkville MS 39759 USA Tel 662 323 5869 Fax 662 323 6551 Requires 9VDC Battery or 12VDC Source for Meter Operation Model MFJ 986 ...

Страница 2: ...al 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 ...

Страница 3: ... tuner s matching network in line or direct no matching circuit configurations Understanding Power Ratings There are no standardized power rating systems for tuners The names used i e 3 kW Tuner carry over from the time when amplifiers were rated by peak power input and not the true RF power output For example the one thousand watt Johnson Matchbox was rated to handle a 1000 watt plate modulated A...

Страница 4: ...ery powers only the meter electronics It does not power the meter LEDs You must supply external DC to illuminate the SWR meter 2 12 VDC External Power The Meter Lamp power jack is located above the Transmitter connector on the rear panel Apply power from any filtered dc wall adapter MFJ 1312D or equivalent or use your station s 13 8 Vdc supply A cord fitted with a 2 1 mm plug is supplied with the ...

Страница 5: ...d by 10 Each picket represents 50 watts below 400 watts and 100 watts from 400 to 2000 watts The reflected power is read on the right hand REFLECTED meter scale This scale indicates 50 watts full scale when the 200W power sensitivity is selected and 500 watts full scale when the 2000W power scale is selected This scale has a picket every watt below 20 watts and every 5 watts above 20 watts This sc...

Страница 6: ...t or through the tuner as selected by the ANTENNA SELECTOR switch B Any antenna fed with a single wire should be connnected to the center hole of COAX 1 or COAX 2 C Any balanced feedline open wire twinlead or twin axial lines is connected to the ceramic BALANCED LINE terminals on the back of the unit D Use the GROUND post to ground the tuner to the transceiver amplifier and earth ground E A dummy ...

Страница 7: ...ns 5 Starting from the minimum INDUCTOR position highest number turn the INDUCTOR control to add more inductance while applying a slight amount of power less than 25 watts Tune for the lowest reflected power and maximum forward power lowest SWR The lowest reading should occur somewhere above the following recommended inductor positions Tuning Chart Frequency MHz Capacitor Value Inductor counter in...

Страница 8: ...maximum power handling capability and efficiency and the least critical tuning adjustments Operating Notes 1 While this tuner is designed to have as large a tuning range as possible there are limits to the tuning range of the capacitor Some antennas may require more or less capacitance than the controls have In these cases the SWR may not be reduced to 1 1 If the SWR is higher than the limits on y...

Страница 9: ...hese power levels make sure you are using the least amount of inductance and the greatest capacitance possible that still allows matching the load on the operating frequency If you are still unsuccessful but the tuner does adjust and operate when switched to a dummy load or another antenna please read the ANTENNA HINTS section Grounding Hints To minimize RFI single wire feedlines such as used with...

Страница 10: ...emely 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 quarter wavelength feedline converts the low antenna impedance to a very high impedance at the tuner A similar probl...

Страница 11: ...42 52 73 83 112 123 or 145 155 ft 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 meter antenna fed the normal way will be extremely reactive with only a few ohms of feedpoint resistance Trying to load an 80 meter halfwave di...

Страница 12: ...n the reference meter Adjust the HI FWD trim pot to set the forward power scale to 1000 Watts 6 To set the reflected power interchange the TRANSMITTER and ANTENNA coax cables so that the transmitter is connected to the ANTENNA connector and the dummy load is connected to the TRANSMITTER connector 7 With the 3000 300 Watts button pushed out for the 60 Watt reflected scale Transmit 10 Watts as indic...

Страница 13: ...r the MFJ Factory at 601 323 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 FAX to 601 323 6551 through Compuserve at 76206 1763 or by email to 76206 1763 Compuserve com Send a complet...

Страница 14: ... the chart below to log values for your station You may want to copy this chart and post it by your tuner Frequency MHz Capacitor Inductor counter indicator 1 8 1 8 2 0 2 0 3 5 3 5 3 5 3 75 3 75 3 75 4 0 4 0 4 0 7 15 7 15 10 1 10 1 14 2 18 1 18 1 21 2 21 2 24 9 28 5 ...

Страница 15: ...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 ...

Страница 16: ...MFJ 986 Manual Version 7A Printed In U S A 300 Industrial Park Road Starkville MS 39759 ...

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