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MFJ-1768 Dual Band Yagi                                                                       Instruction Manual 

9  

 
 

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, or forgery shall be cause to void any and all warranty 
terms immediately. 

 

2.

 

MFJ Enterprises, Inc. agrees to repair or replace, at no charge to the original owner, any defective 
product under warranty provided the product is returned postage prepaid to MFJ Enterprises, Inc. with a 
personal check, cashiers check, or money order for 

$7.00 

covering postage and handling. 

 

3.

 

MFJ Enterprises, Inc. will supply replacement charges free of charge for any MFJ product under 
warranty upon request. A dated proof of purchase and a

 $5.00

 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 (601) 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 charges will be shipped COD to the owner. 

 

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 Road, 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. 

 

12.

 

This warranty gives you specific rights, and you may also have other rights which vary from state to 
state. 

 

Содержание MFJ-1768

Страница 1: ...ruction Manual Table of Contents Introduction 2 Choosing a Location for the Antenna 2 Tools and Time Requirements 3 MFJ 1768 Parts List 3 Safety Precautions 3 Assembly and Installation 4 Tuning 7 Grounding Considerations 7 Maintenance 8 Technical Assistance 8 ...

Страница 2: ... band antenna there is no need to switch antennas when changing bands With the use of a duplexer such as the MFJ 916 you can connect two different radios two different bands to the MFJ 1768 at the same time Choosing a Location for the Antenna The MFJ 1768 can be mounted on any 1 to 1 1 2 mast conductive or non conductive capable of supporting the weight of the antenna and the torque developed by t...

Страница 3: ...One bag containing the following hardware Twenty 3 16 ID insulators 30 push nuts 3 16 ID Two 1 1 8 red end caps One U bolt and saddle clamp assembly Push nut assembly tool Two capacitor thin plates for 2 m elements Two 4 40 x 1 2 SST screws Ten 4 40 SST nuts One 1 1 8 diameter 6061 T6 aluminum tubing boom Safety Precautions WARNING This antenna is an electrical conductor Contact with power lines c...

Страница 4: ...nstallation During assembly of this antenna refer to figures in this manual and the picture on the front cover The assembly instructions tell you step by step how to install the insulators the driven and parasitic elements and the U bolt assembly All parasitic elements for 2 meter and 70 cm band are color coded at their ends and alphabetically labeled on figure 1 and on figure inside front cover t...

Страница 5: ... start the assembly of the driven elements as follows A The 2 meter driven element Align the holes drilled on the end of a 19 1 4 x 1 4 tube with the 4 40 screws located on the rear end of the feed plate see figure 3 for exact location Insert the 4 40 screws into these holes Thread 4 40 nuts over the two screws and tighten to ensure good connections Repeat the same procedure for the remaining 19 1...

Страница 6: ...or section 7 and 8 refer to figure 1 figure 4 and figure 5 while assembling 7 Insert element A black end from GROUP 1 into its designated hole in the boom as shown in the figure on the inside front cover Assemble another push nut from the other side see figure 4 and figure 5 and slide it until it reaches the 3 16 black insulator Make sure that the element is secured in place with minimum free play...

Страница 7: ...e boom and run it along the permanent mast Hold it in place using either electric tape or black cable ties Tuning The MFJ 1768 is pre tuned on both bands additional tuning is not required The antenna bandwidth is very wide it covers the entire 2 meter and 70 centimeter band with an SWR less than 2 1 Grounding Considerations Although this antenna is designed to operate efficiently without the requi...

Страница 8: ...through the threads and protect the connectors from corrosion THIS IS THE SAME TYPE OF SEALER THAT COMMERCIAL ANTENNA INSTALLERS AND CATV COMPANIES USE WITH GREAT SUCCESS A less desirable but still adequate sealer is the automobile seam sealer commonly sold as coax seal This is a pliable black sealing compound When installing any coax seal NEVER completely cover the barrel of the coax connector Th...

Страница 9: ... 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 601 323 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 teste...

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