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Page 17
KEY
Start measurement at
center
-
point of:
Finish measurement at
center
-
point of:
Measurement distance be-
tween points
A
Boom edge
Director EHU
3.25 inches
B
Director EHU
Driven EHU
41.50 inches
C
Director EHU
Center of Mast Plate
20.75 inches
A
B
C
SECTION 1.0
PREPARING THE BOOM ASSEMBLY
EHU Mounting Locations
EHU CENTER
-
TO
-
CENTER SPACING MEASUREMENTS
It is critically important that the center
-
to
-
center spacing is correct when assembling your SteppIR Ya-
gi. Use
Figure 1.00
for placement of each of the elements. Start from the left edge of the boom and
measure from there.
As you assemble each of the element housing units (EHU), refer to this drawing. We recommend this
sequence:
1.
Secure the driven and director element mounting plates to the boom using the correct saddles and
fasteners
(be sure to use anti
-
seize on all stainless steel fasteners).
Tighten enough to
hold them in place, but loose enough so you can move the mounting plates for final tightening.
2.
Wire the EHUs and secure them to the element mounting plates (don
’
t forget the gasket!). The
mounting plate itself acts as the lid for the EHUs.
3.
Measure the center
-
to
-
center lengths, level the mounting plates and firmly tighten.
4.
Re
-
measure all of your lengths and correct if needed. Take your time; get it right.
All of this is covered in greater detail in this manual, but it
’
s important to understand the proper flow
BEFORE you start—it will save a lot of time.
FIG. 1.00