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Page 39
CHAPTER THREE
SECTION 3.5
DRIVEN ELEMENT (continued)
RETURN TUBE ASSEMBLY (continued)
Locate the 1-3/4” x 66-3/8” element support tube (PN 70-2028-01). Measure 6 inches from the flush end
of the element support tube (EST) and mark with a felt pen as shown in
figure 3.58
. Repeat for the other
EST.
Insert the EST end into the stress relief tube as shown in
figure 3.59
. Position the EST so that the mark
you made is flush with the stress relief tube as shown in
figure 3.60.
Repeat for the other EST. Be sure
that the stress relief tube is centered on the return plate. The end of the tube should be 2.25 inches from
the aluminum saddle on each end of the return plate as shown in
figure 3.61
. Tighten the saddles to no
more than 7 ft lbs.
Figure 3.62
and
figure 3.63
show the completed Driven element. It is a good idea to place the EST’s on
sawhorses as shown in
figure 3.64
. This will stabilize the boom as you continue with construction of the
antenna.
FIG. 3.59
FIG. 3.62
FIG. 3.58
FIG. 3.63
FIG. 3.61
FIG. 3.60
FIG. 3.64
