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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.
Position the aluminum mounting plate (PN 10-1015-11) and align the 2-1/4” aluminum saddle halves
(PN 10-1601-32) as shown in
figure 6.02
. Insert the 5/16” x 3-3/4” hex head bolts (PN 60-0114) 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 6.03
. Align the gasket
with the holes on the mounting plate. Place the Director 1 EHU (PN 70-3420-01) onto the mounting plate
as shown in
figure 6.04
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 6.05
. Be sure that the flat washer is
between the machine screw head and the EHU housing as shown in
figure 6.06
. 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 (150 inches) from the center-point of the Driven element to the center-point of
the Director 1 element.
(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 6.07).
Level the EHU as shown in
figure 6.08
and tighten the aluminum saddles firmly.
Figure 6.09
shows the
completed Reflector EHU and return tube.
CHAPTER SIX
SECTION 6.0
DIRECTOR 2 EHU (continued)
MOUNT THE DIRECTOR 2 EHU ONTO THE BOOM
FIG. 6.03
FIG. 6.04
FIG. 6.02
FIG. 6.07
FIG. 6.09
FIG. 6.05
FIG. 6.06
FIG. 6.08