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Refer to the center-to-center measurements in
Chapter Two
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. Posi-
tion 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 4.10
. 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 4.11
. Note that only the
Driven element has an independent lid, the rest of the EHU’s use the element mounting bracket as the “lid”.
Align the gasket with the holes on the mounting plate. Place the Reflector EHU (PN 70-3422-01) onto the
mounting plate as shown in
figure 4.12
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 4.13
. Be sure that the flat washer
is between the machine screw head and the EHU housing as shown in
figure 4.14
. 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 center-point of the return tube to the center-point of the element (30.0
inches) as shown in
figure 4.15
.
(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 4.16.
Level the EHU as shown in
figure 4.17
and tighten the aluminum saddles firm-
ly.
Figure 4.18
shows the completed Reflector EHU and return tube.
CHAPTER FOUR
SECTION 4.1
REFLECTOR EHU (continued)
MOUNT THE REFLECTOR EHU ONTO THE BOOM
FIG. 4.10
FIG. 4.11
FIG. 4.12
FIG. 4.14
FIG. 4.13
FIG. 4.15
FIG. 4.16
FIG. 4.18
FIG. 4.17
