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Page 33
CHAPTER THREE
SECTION 3.2
MOUNTING THE EHU’S ON THE BOOM (continued)
SECURE MOUNTING PLATE AND EHU TO BOOM—DIRECTOR
Refer to the center-to-center measurements in
figure 3.02 in Chapter Three, Section 3.0
when installing
each of the EHU’s and mounting plates to the boom. The EHU should already be wired before placing it on
the aluminum mounting plate.
Position the aluminum mounting plate (PN 10-1015-11) and align the 1-3/4” aluminum saddle halves
(PN 10-1601-03) as shown in
figure 3.21
. Insert the 5/16” x 3-1/2” hex head bolts (PN 60-0065) and thread
on the 5/16” Nylock nuts (PN 60-0046). Insert a set screw on the exposed side of the aluminum saddle.
Tighten but allow the mounting plate to be loose enough for adjusting the center-to-center measurement.
Be sure to use anti-seize on all stainless steel fasteners.
Place the EHU gasket (PN 10-1502-01) onto the mounting plate as shown in
figure 3.22
. Align the gasket
with the holes on the mounting plate. Place the EHU (PN 70-3406-01) onto the mounting plate and attach
using the #10 x 3/4” machine screws (PN 60-0017), #10 flat washers (PN 60-0018) and #10 Nylock nuts
(PN 60-0019) as shown in
figure 3.23
. Be sure that the flat washer is between the machine screw head and
the EHU housing as shown in
figure 3.24
. Tighten the Nylock nuts enough to compress the gasket material
but do not over tighten or you can crack the plastic EHU housing.
Measure the proper distance from the edge of the boom to the center point of the element (5.0 inches) as
shown in
figure 3.25
.
(A tip from Adam Blackmer K7EDX, SteppIR operations manager— use the mold spline
located on the EHU housing as a place to hold your tape measure edge when measuring center-to-center
as shown in
figure 3.26
)
Level the EHU as shown in
figure 3.27
and tighten the aluminum saddles firmly.
FIG. 3.21
FIG. 3.22
FIG. 3.23
FIG. 3.24
FIG. 3.25
FIG. 3.26
FIG. 3.27
