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MFJ-1775 Rotatable Mini-Dipole 

                                                 Instruction Manual 

 

 

1

MFJ-1775 PARTS LIST 

 

As you unpack your antenna you should find the parts in the following list. 

 

Part Description 

 

 

QTY  MFJ Part No. 

Balun 

    1 

80-1775-10

 

6-32 x 3/8” screw 

 

 

80 

656-0375S 

¼-20 x 1-3/4 bolt 

 

 

662-1760S-HH 

6-32 

kep 

nut 

   80 

705-0632S 

10-32 

hex 

nut 

   10 

705-1032S 

¼-20 

hex 

nut 

   4 

705-2520S 

#10 lock washer 

 

 

711-1037S-EX 

¼ split lock washer 

 

 

711-2537S-SL 

Hose clamp (#16) 

 

 

745-3116S 

16” Threaded Rod (2M stub) 

 

758-8252 

55” Threaded Rod (6M stub) 

 

758-8253 

640 

U-bolt 

Set 

   2 

758-9200 

1/8” Plastic Spoke Caps  

 

35 

765-1002 

Aluminum “L” Stabilizer Bracket 

805-1796-7 

Fiberglass Stabilizer Insulator   

807-1796-6 

Aluminum Stub Channel Bracket 

808-1796-5 

1 x 12” Fiberglass Rod   

 

808-1775-12

 

1-1/8 x 60” AL Tube 

 

 

810-1796-2 

30” LONG Spokes 

 

 

810-1796-3C 

26” MEDIUM Spokes   

 

810-1796-5C 

12” SHORT Spokes 

 

 

24 

810-1796-6C 

Loading Coil Assembly  

 

811-1796-1C1 

 

For installation, you will need some items not supplied with the antenna installation kit: 

• 

A 6'-8' rigid mast or other mounting pipe between 1" and 1.5" outside diameter. (suitable materials 

include TV mast sections, galvanized iron pipe, or heavy duty rigid conduit.) 

• 

Quality low-loss 50-Ohm coax with a PL-259 from antenna to transmitter. 

An Antenna Analyzer (MFJ-259B or similar), or SWR meter and transceiver

 

 
 
 
 
 
 
 
 
 

 

INRADIO
ABEL & PRO-FIT Centrum Radiokomunikacji

tel.

fax:

e-mail:
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Poland

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(+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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