Tuning; Grounding Considerations - MFJ -1768 Instruction Manual

MFJ-1768 Dual Band Yagi Instruction Manual
FIGURE 6
FIGURE 5
10- Lay the antenna on a flat surface to install the thin capacitor plates for the 2 meter driven elements.
Insert a 4-40 x 1/2" screw through the hole located in the middle of the element, pass it through a thin
capacitor plate. Thread a 4-40 nut on the screw and tighten. Repeat this procedure for the second
driven element (see Figure 3).
IMPORTANT: Make sure the capacitor thin plates form a 90 degrees angle with the 2 meter
driven elements
11- The antenna is ready now to be mounted on the permanent mast and ready to be used on the air.
Note:
Make sure to dress the feed coax cable along the boom and run it along the permanent
mast. Hold it in place using either electric tape or black cable ties

Tuning

The MFJ-1768 is pre-tuned on both bands, additional tuning is not required. The antenna bandwidth is
very wide, it covers the entire 2 meter and 70 centimeter band with an SWR less than 2:1.

Grounding Considerations

Although this antenna is designed to operate efficiently without the requirement of an earth ground,
SAFETY GROUNDING MUST STILL BE PROVIDED to protect equipment, property and persons
from the hazards of lightning strikes and other weather related electrical discharges. In addition the
coaxial cable feeding the antenna should have the shield grounded to eliminate the risk of any indoor
equipment failure from allowing hazardous voltages from appearing indoors and creating a shock
hazard.
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