MFJ 1798 - Page 10

MFJ-1798 Vertical Antenna Instructions
9
NOTE
- A small adjustable crescent wrench can substitute for the 3/8" and 7/16" open
end wrenches.
IMPORTANT: Do not use a high torque electric screwdriver to mount the
capacitance spokes or any of the #4 through #10 hardware.
The hardware may be damaged if excessive or uncontrolled
torque is applied during assembly.
Locate the following parts
. The abbreviation "Gp" precedes the Group the part is located in:
One fiberglass base insulator and mounting bracket assembly (Gp A)
One balun and feedline assembly (Gp A)
Two 1/4-20 x 1-3/4" bolts (Gp B1)
Four 6-32 x 5/8" screws (Gp B3)
Two 1/4-20 nuts (Gp B3)
Two 1/4" split ring washers (Gp B4)
Four 6-32 nuts (Gp B4)
Two white nylon insulators (Gp B5)
U-bolt
Referring to figure 1:
4- Install the U-bolts on the open face of the base insulator mounting bracket.
Mount the saddle clamps with the flat side against the plate, and the toothed side facing the
rounded U-bolt area. These clamps will secure the antenna to the mast.
5- Put the lock washers over the 1/4-20 bolts and slide one of the bolts through the upper balun
mounting hole on the side bracket of the base mounting plate. The upper mounting hole is
located at the end of the bracket where the fiberglass insulator sticks out.
6- Use a white nylon insulator to space the balun away from the bracket, and be sure the balun
hole closest to the end of the balun with the very long lead is bolted to the top bracket hole.
Install the nut inside the balun form. Finger tighten only.
7- Attach the bottom balun hole to the bottom hole in the mounting assembly as explained in step
5. Snug both bolts until the split ring washer just collapses with a 7/16" wrench.
8- Bolt the coax connector housing to the base mounting assembly with four 6-32 x 5/8" screws
and 6-32 nuts.
Figure
1