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Page 34
CHAPTER THREE
SECTION 3.4
DIRECTOR 1 EHU (continued)
INSTALLING THE CPVC INNER GUIDE TUBE—DIRECTOR 1
All of the looped elements have inner guide tubes. The DB42 Director 1 element utilizes a different method for at-
taching 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 working with
the first section of the tube (PN 70-2025-33). We recommend you wait until just before the telescoping 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 pieces 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
