MFJ-1775 Rotatable Mini-Dipole
Instruction Manual
4
TOOLS AND TIME REQUIRED FOR ASSEMBLY
The estimated assembly time is two hours. Antenna assembly requires the following hand tools
:
•
#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.
You also need two stable supports at least 30" tall (saw horses, trash cans, etc) during assembly, and a
short (6-8') temporary mast (1 to 1-1/2" OD) for temporary mounting during tuning.
SAFETY PRECAUTIONS:
WARNING! You can be killed if the antenna, feedline, or the equipment 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 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 of the capacitance spokes can
cause eye injury, serious RF burns or both.
3.
Make sure that the mast is sturdy enough to support the 15 pound weight and the wind loading of
approximately 2 square feet.
ASSEMBLY and INSTALLATION PROCEDURE
Refer to the figures in this manual during assembly. Assembly consists of putting together the
balun/center insulator assembly, then connecting the aluminum radiating elements to the balun/center
insulator assembly. Next the 6- and 2-meter stub elements are installed. Finally the loading coil
assemblies are assembled and installed on the aluminum radiating elements.
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.
