MFJ-1789 Rotatable Mini-Dipole
Instruction Manual
6
The 6- and 2-meter stubs are not required if you have no interest in operating on these bands. HF band
operation will not be affected if the 6- and 2-meter stubs are not present.
After the antenna is assembled and adjusted for resonant frequency and SWR, it can then be mounted on
a tower or rooftop and given final adjustments.
WARNING:
Wear safety glasses whenever working with this antenna.
Step-By-Step Procedure
1)
Set up saw horses or other stable supports (plastic trash cans, chairs, folding tables, etc.) to
support the antenna during assembly.
2)
Prepare a temporary 6-8’ ground-level mounting mast for easy initial testing and adjustment.
3)
Sort the antenna parts into groups of similar parts. Be sure all parts are available.
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 and 2 meter stub nuts
o
Two 7/16" open-end wrenches (or wrench and nut driver) for U-bolts and
center insulator 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 insulators with 6-32 x 3/8"
screws (3 each) and the 6-32 kep nuts (3 each) as shown in Figure 1.
6)
Bolt the balun loosely to the 1 x 12” fiberglass rod using the U-bolt set and ¼-20 hardware. The
nuts will be tightened when the antenna is mounted on the mast. See Figure 2.
Hole for 6 or 2
meter stub
Fiberglass
insulator
Aluminum
L-bracket
6-32 x 3/8
screws (3)
6-32 nuts (3)
Figure 1
Fiberglass Rod
Balun
¼-20 LW&
nut (2 places)
U-Bolt set
Figure 2: Balun/Center Insulator Assembly – Top View
Summary of Contents for 1789
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