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Page 22
CHAPTER TWO
SECTION 2.0
MOUNTING THE EHU’S ON THE BOOM
KEY
Start measurement at
center-point of:
Finish measurement at
center-point of:
Measurement distance be-
tween points
EDGE
Edge of boom
Reflector EHU
4 inches
A
Reflector EHU
Driven EHU
84 inches
B
Driven EHU
Director 1 EHU
116 inches
C
Director 1 EHU
Director 2 EHU
150 inches
D
Director 2 EHU
Director 3 EHU
154 inches
E
Reflector EHU
Reflector return tube
30 inches
F
Director 1 EHU
Director 1 return tube
30 inches
G
Director 3 return tube
Director 3 EHU
30 inches
EDGE
Director 3 EHU
Edge of boom
4 inches
H
Reflector EHU
Director 3 EHU
504 inches
J
Edge of boom
Edge of boom
512 inches
A
B
C
D
G
F
J
154”
84”
116”
150”
E
H
REF EHU
DRIVEN EHU
DIR 1 EHU
DIR 2 EHU
DIR 3 EHU
FIG. 2.01
It is critically important that the center-to-center spacing is correct when assembling your SteppIR Ya-
gi. Use
figure 2.01
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’s), refer to this drawing. We recommend
this sequence:
1. Secure the 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 EHU’s and secure them to the element mounting plates (don’t forget the gasket!). The
mounting plate itself acts as the lid for the DB42 EHU’s.
3. Measure your 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.
CENTER-TO-CENTER SPACING MEASUREMENTS