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Page 40
CHAPTER FOUR
SECTION 4.0
REFLECTOR EHU (continued)
SECURE MOUNTING PLATE AND EHU TO BOOM—REFLECTOR
Refer to the center-to-center measurements in
Chapter Two
when installing each of the EHU’s and mount-
ing 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 4.02
. 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 4.03
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 4.04
. Be sure that the flat washer is between the ma-
chine screw head and the EHU housing as shown in
figure 4.05
. Tighten the Nylock nuts enough to com-
press 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 4.06
.
(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 4.07
)
Level the EHU as shown in
figure 4.08
and tighten the aluminum saddles firmly.
FIG. 4.02
FIG. 4.03
FIG. 4.04
FIG. 4.05
FIG. 4.06
FIG. 4.07
FIG. 4.08