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Page 85
When attaching the telescoping fiberglass poles to each of the EHU’s, special care must be taken to ensure that
the rubber plugs that are in the base section of each pole are removed before placing the telescoping poles on-
to the EHU.
Failure to remove these plugs will result in catastrophic failure of the EHU
.
Figure 13.11
shows how the plug is in place for shipping purposes. Each end of the DB42 boom has a 40/30 loop for use on
40m as well as the 49 ft loop Driven element, for a total of three elements on 40m/30m . These loops were
prepared earlier in the installation process and should look like the one shown in
figure 13.12
. Be sure to put
your quick disconnect boot (PN 10-1006-22) onto the pole before inserting into the EHU.
The CPVC inner guide tube is inserted into the EHU side of the loop assembly as shown in
figure 13.13
. A close
up view of this assembly is shown in
figure 13.14
. The guide tube is not required for the non-EHU side of the
loop (commonly called the return tube). Insert the guide tube so that the edge of the diverter cone is flush with
the base of the telescoping pole as shown in
figure 13.15
. Slide the pole base and guide tube into the EHU
tube until it bottoms out firmly as shown in
figure 13.16
. There may a small portion of unpainted pole protrud-
ing. This is OK as it is shielded from the sun by the quick disconnect boot. There is a raised area called a lock-
ing ring that is molded onto the base section of each of the telescoping poles. These are there so that the
quick disconnect boot cannot “slide” off in the event of high winds.
Figure 13.16
shows the locking ring. Align
the telescoping pole on the return tube side of the loop. Insert the end firmly into the return tube as shown in
figure 13.17
.
Before tightening the quick disconnect boots, twist the base sections of the telescoping poles until the loop por-
tion of the element is as level as possible, as shown in
figure 13.18. Chapter Fourteen
shows this leveling pro-
cess in greater detail, specifically
figures 14.29, 14.30 and 14.31
. Tighten the quick disconnect boots firmly.
Wait 20 minutes and tighten again—the flexible material will tend to cold flow initially. It is also a good idea to
do a final tightening of all the quick disconnect boots and all fasteners as a last step before mounting the an-
tenna onto the tower mast. Repeat above steps for the other half of the loop. The installation pictures below
represent the Reflector element. Repeat the above steps for Director 2. The instructions are exactly the same
with the exception of the orientation of the EHU and return tube.
FIG. 13.11
FIG. 13.14
FIG. 13.13
FIG. 13.12
FIG. 13.17
FIG. 13.16
FIG. 13.15
FIG. 13.18
CHAPTER THIRTEEN
SECTION 13.1
ATTACH THE ELEMENTS TO THE EHU’s (continued)
SECURING THE ELEMENT SUPPORT TUBE (EST) TO THE EHU (continued)
