Locate and position the seven sections of boom tubing, and the respective fasteners.
Rub a thin film of connector protector around the circumference of all male
boom pieces BEFORE sliding the female sections over them (Figure 2). Also, do
not twist the aluminum tubing excessively as that can cause binding.
Assemble
the boom by sliding the seven sections together in the order shown on
Drawing 1
.
Note:
The boom bolts need to have a total of “5” flat washers on each bolt to pre-
vent the nut from bottoming out at the end of the threads before it is tight.
Insert the required bolts into the holes and loosely attach them with the 1/4” Nylok
nuts.
Note:
In some cases you may find it necessary to assist the bolts that you are install-
ing by “threading’ them with a wrench. Do NOT attempt to hammer them
into place.
On the boom connections numbered 1 and 6 (see
Drawing 1
) one hole will be larger
than the other. The smaller hole is for the 1/4-20 x 2.50” bolt and Nylok nut, the lar-
ger hole is for the 5/16” eyebolt that holds each end of the Pillystran Kevlar™ truss
material in place (
Figure 3
). There is also a hole for a third 5/16” x 4” eyebolt (used
for the EZeye™ feature explained later) located at the center point of the boom. In-
stall this eyebolt with the nut and lock washer as shown in
Figure 4
.
Now tighten the nuts on each bolt and eyebolt securely. Before continuing to the next
step verify that
all
nuts and bolts, including those installed at the factory, are securely tightened.
SteppIR Antennas - 4 Element
11
Figure 2
Figure 3
Figure 4
Connect the Boom-to-Mast Plate to the Boom
We are showing you this step now, even though in all likelihood this may be one of the last steps, as you
raise the finished antenna up to the tower. It is a good idea to use the mast plate and a temporary mast as
a means of supporting the antenna while assembling the elements, and to familiarize yourself with the
EZeye™ adjustment system before you are up on the tower!
The mast plate consists of two identical pieces, each 11.5” x 11.5” x 3/16” thick. The mast plate has 13
pre-drilled holes (
Figure 4.5
). The 2” mast holes are used to secure the antenna to the mast on your
tower. The 2-1/2” boom holes are used for attaching the boom to the mast plate. The EZeye™ hole will
be explained later in this section.
1) EZeye™ – 1 Hole .402 dia.
2) 2 1/2” Boom – 4 Holes .402 dia.
3) 2” Mast – 8 Holes .344 dia.
1
2
2
3
3
Summary of Contents for 4 Element Yagi
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Page 14: ...SteppIR Antennas 4 Element 14 CONNECTING THE CONTROL CABLE TO THE D25 SPLICE ...
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