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MFJ-1775 Rotatable Mini-Dipole 

                                                 Instruction Manual 

 

 

12

 Plast-Dip

TM

 and Liquid Electrical Tape

TM

, available at your local hardware store, also do an excellent job 

of insulating/waterproofing connectors, and can be easily peeled off when desired. 
 
A less desirable, but still adequate sealer is the automobile seam sealer commonly sold as "coax seal". 
This is a semi-pliable black or white sealing compound. 
  
When installing any "coax seal", NEVER completely cover the barrel of the coax connector. The sealer 
should ONLY be placed near the junction of the threaded part of the chassis connector and the knurled 
area of the male connector. This will leave the bottom of the male outer sleeve open and permit the 
connector to "breathe" so it does NOT collect moisture! 

 

TECHNICAL ASSISTANCE 

 
If you have any problem with this unit first check the appropriate section of this manual. If the 
manual does not reference your problem or your problem is not solved by reading the manual, 
you may call 

MFJ Technical Service

 at 

662-323-0549

 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.  You can also send questions by mail 
to MFJ Enterprises, INC., 300 Industrial Park Road, Starkville, MS 39759; by Facsimile (FAX) 
to 662-323-6551; or by email to [email protected].  Send a complete description of 
your problem, an explanation of exactly how you are using your unit, and a complete description 
of your station. 

INRADIO
ABEL & PRO-FIT Centrum Radiokomunikacji

tel.

fax:

e-mail:
internet:

ul. Puszkina 80

92-516 £ódŸ

Poland

(+42) 649 28 28

(+42) 677 04 71

[email protected]

www.inRADIO.pl

Autoryzowany Przedstawiciel MFJ w Polsce:

Summary of Contents for MFJ-1775

Page 1: ...6 6 Aluminum Stub Channel Bracket 4 808 1796 5 1 x 12 Fiberglass Rod 1 808 1775 12 1 1 8 x 60 AL Tube 2 810 1796 2 30 LONG Spokes 4 810 1796 3C 26 MEDIUM Spokes 8 810 1796 5C 12 SHORT Spokes 24 810 17...

Page 2: ...rsatile rotatable dipole Each HF band uses separate efficient end loading coils wound on fiberglass forms with TeflonTM wire and capacitance hats no lossy traps 6 and 2 meters are full length half wav...

Page 3: ...s mount this antenna so that it is out of the reach of adults and children The capacitance elements can cause injury and or severe RF burns Permanent Installation The ideal installation is a rigid pol...

Page 4: ...e you to lose your balance if it is handled too casually or if the capacitance spokes are snagged on a gutter ladder tree limbs etc 2 Mount the antenna high enough so that it is out of reach The ends...

Page 5: ...bolts Heavy wire cutters for trimming capacitance spokes Pliers for holding the spoke ends as they are trimmed Safety glasses 5 Assemble the four small L brackets to the four long fiberglass insulato...

Page 6: ...n Figure 4 9 Using eight hose clamps four on each radiator clamp the fiberglass insulators so as to support the 16 and 55 threaded rods Position the insulators as shown in Figure 4 10 Mount the four s...

Page 7: ...ng 12 Install four short spokes in the 20 meter rings of both loading coil assemblies With a 5 16 nut driver tighten the nuts until the spokes are snug 13 Install four short spokes in the 15 meter rin...

Page 8: ...ed on a tall support will make adjustments difficult and time consuming It is best to install the antenna on a short temporary mast or pipe that is located in a reasonably clear location for tuning Th...

Page 9: ...as to keep the cut piece from flying off and causing injury The following tips will help you obtain a better SWR on 40 meters than the tuning method used on other bands On 40 meters the lowest SWR is...

Page 10: ...e stub fully extended and 148 MHz with the stub fully contracted NOTE The 2 meter resonance is affected by other resonances in the overall antenna structure You may find a fixed resonance close to the...

Page 11: ...owing hazardous voltages that could create a shock hazard Adequate protection can be accomplished by grounding the shield of the coax to a good earth ground where it enters the building or directly bu...

Page 12: ...SSISTANCE If you have any problem with this unit first check the appropriate section of this manual If the manual does not reference your problem or your problem is not solved by reading the manual yo...

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