MFJ-1768 Dual Band Yagi Instruction Manual
4
- Keep this antenna out of reach of adults, children, and animals. Any contact with this
antenna while transmitting will cause severe RF burns, and voltages that KILL.
- Never place this antenna close to electric power lines or utility wires.
- Do not transmit with over 20 watts of power when people are near the antenna.
- Keep the antenna away from you to prevent exposure to high levels of electromagnetic
field radiation.
- Never operate this antenna near RF sensitive medical devices such as pacemakers.
- Keep the feedline of this antenna away from utility lines.
- Be careful while climbing and carrying the antenna. It is heavy enough to cause you to
loose your balance if it is handled too casually.
- Mount the antenna high enough so that it is out of reach of adults and children. The end
of the elements can cause eye injuries, serious RF burns , or both.
-Make sure the mast and rotator are strong enough to support the antenna's weight and
wind load of approximately 2 square feet.
Assembly And Installation
During assembly of this antenna refer to figures in this manual and the picture on the front cover. The
assembly instructions tell you, step by step, how to install the insulators, the driven and parasitic
elements, and the U-bolt assembly.
All parasitic elements, for 2 meter and 70 cm band, are color coded at their ends and alphabetically
labeled on figure-1 and on figure inside front cover to facilitate the antenna assembly. Pay extreme
care while assembling the antenna and always refer to the mentioned figures.
Step by Step Procedure
1- Prepare a strong mounting mast that can withstand a wind load of at least 2 square feet and permit
easy installation. Set up a table or other stable support.
2- Sort out parts you have unpacked into groups of similar parts. These consist of:
[ ] twenty 3/16" ID black insulators
[ ] 30 push nuts 3/16" ID
[ ] One U-bolt assembly
[ ] Two capacitor thin plates for 2 m elements
[ ] Two 4-40 x 1/2" SST screws and ten 4-40 SST nuts
[ ] One 1 1/8" diameter (6061-T6) aluminum tubing boom with matching network and SO-239
connector on an "L" bracket (
pre-assembled
)
[ ] One bundle of long elements for the two meter band
GROUP 1
- Two 19 1/4" x 1/4" long tubes
- One 36 3/8" long.............................A.........................Black
- One 37" long...................................B.........................White
- One 39 3/4" long..............................C.........................Green
