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Page 35
CHAPTER THREE
SECTION 3.4
DRIVEN ELEMENT (continued)
INSTALLING THE CPVC INNER GUIDE TUBES
All of the looped elements have inner guide tubes. The DB36 Driven element utilizes a different method for
attaching the inner guide tubes than the two 39 foot end loops due to it’s extra length.
There are three sections to the inner guide tube as shown in
figure 3.40
. In this chapter, you will be work-
ing with the first section of the tube (PN 70-2025-33). We recommend you wait until just before the tele-
scoping poles are attached later in this manual before gluing the remaining sections. This will keep you from
potentially tripping over them while the rest of the antenna is being assembled.
When gluing the 3 piec-
es together, be sure you do NOT put any glue inside the coupler—only apply glue to the outside
diameter of the tubing.
Locate the section of the guide tube that has the pre-installed foam centering rings and the black rubber
coupler on it (PN 70-2025-33). The foam centering rings have a slot in them as shown in figure
3.41
. It is
important that these slots are facing upward when inserting into the element support tube (EST). The slots
are used as vents to assist in preventing condensation from forming internally. Because you will not be able
to see that the slots are indeed pointing upward once the guide tubes are in place, we recommend you mark
the correct position on the opposite end of the guide tube as shown in
figure 3.42
. Insert the inner guide
tube into the EST as shown in
figure 3.43
and continue to push until the black rubber coupler is protruding
slightly as shown in
figure 3.44
.
Figure 3.45
is a cutaway drawing to give you a visual perspective during
this process.
Driven Element EST— Inner guide tube assembly
(Drawing is shown as a cut-away for visual purposes
)
70-2025-13
49” Guide tube with coupler
70-2-25-23
39-7/8” Guide tube plain end
70-2025-33
Guide tube with rubber coupler
GLUE GOES HERE
FIG. 3.40
FIG. 3.41
FIG. 3.42
FIG. 3.43
FIG. 3.44
FIG. 3.45