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MFJ-1789 Rotatable Mini-Dipole

Instruction Manual

14

NOTES

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Summary of Contents for 1789

Page 1: ......

Page 2: ...ket 4 805 1796 7 Fiberglass Stabilizer Insulator 4 807 1796 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 1 8 AL ROD 27 IN 2 EXTRA 10...

Page 3: ...st versatile 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 hal...

Page 4: ...ightning protection WARNING Always 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...

Page 5: ...ent used to install the antenna accidentally contacts any utility lines Never install an antenna near power lines 1 Be careful while climbing and carrying the antenna It is heavy enough to cause you t...

Page 6: ...4 After examining the antenna parts gather the following tools needed for assembly 2 Phillips screwdriver 5 16 nut driver for 6 nuts and hose clamps Small 4 6 adjustable wrench OR o 3 8 wrench for 6 a...

Page 7: ...tube fiberglass assembly and through the balun lugs Add the 20 split lock washers and nuts and tighten securely See Figure 3 8 Slide four hose clamps over each aluminum tube Slide two hose clamps one...

Page 8: ...rings of both loading coil assemblies loosely holding them in place with their associated nuts Position the screws so the threaded ends of the screws are pointed outward towards the two ends of each l...

Page 9: ...clamp onto the aluminum radiator Slide the aluminum radiator tube until it contacts the mounting screw that was just loosened Slide the hose clamp over the tab and tighten the hose clamp to firmly at...

Page 10: ...e the resonant frequency Conversely adding a longer capacitance spoke will lower the resonant frequency of a loading assembly Spare spokes are included in case you need to lower the resonant frequency...

Page 11: ...l sections from the end of the spoke until the antenna resonates approximately 15 KHz below the desired operating frequency Use the chart below to approximate the amount of spoke to be trimmed Trimmin...

Page 12: ...on the outer ends of all spokes Note that the plastic end caps will lower the resonant frequency on all HF bands by 30 50 kHz The plastic end caps should fit snugly on the spokes Should a cap fit too...

Page 13: ...r 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 botto...

Page 14: ...MFJ 1789 Rotatable Mini Dipole Instruction Manual 14 NOTES...

Page 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 k...

Page 16: ...MFJ 1789 Manual Version 1B Printed In U S A 300 Industrial Park Road Starkville MS 39759 MFJ ENTERPRISES INC...

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