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Page 44
SECTION 4.6
ATTACH THE ELEMENTS TO THE EHUs (continued)
SECURING THE ELEMENTS TO THE EHU (continued)
When attaching the telescoping fiberglass poles to each of the EHUs, 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 onto the EHU.
Failure to remove these plugs will result in catastrophic failure of the EHU
.
Figure 4.61
shows how the plug is in place for shipping purposes.
The URBANBEAM two elements join together to form one large loop. These elements were prepared earlier
in Section 4 and should look like the ones shown in
Figure 4.39.5
. 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 Driven EHU side of the loop assembly as shown in
Figure
4.60
. 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 4.62
. Position a loop to be installed and orient it so the drain hole in the Loop
Splice will be facing down to the ground when the antenna is installed. Slide either telescoping pole into the
appropriate EHU (remember that only the poles going into the Driven EHU have the CPVC guide tubes inside
of them) until it bottoms out firmly (in very rare cases the pole butt may need sanding to allow it to slide
freely). There may be a small portion of unpainted fiberglass pole protruding as shown in
Figure 4.65
, this
is normal, just make sure it is bottoming out on the diverter that is inside the EST tube. The unpainted part
of the pole will be protected from the sun by the quick disconnect boot. Put a quick disconnect boot on the
other loop pole and place the pole on top of the EHU box so that it hits the round protrusion as shown in
Figure 4.63
(it will stay there pretty well but you may want someone to hold it if possible as you perform
the next step) then take a rope or cord and pull the two poles together until the butt ends of each are fairly
close to parallel, then tie it off. This allows easy insertion of the remaining pole into the appropriate EHU.
Once both poles are properly inserted as shown in Figure 4.64 you can remove the rope.
Before tightening the quick disconnect boots, twist the base sections of the telescoping poles until the loop
portion of the element is as level as possible
.
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 antenna
onto the mast.
FIG. 4.65
FIG. 4.61
FIG. 4.64
FIG. 4.63
FIG. 4.62
