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Section 5.1: Mounting EHUs to the Boom
Attaching the EHU to the boom is a 2 step process utilizing the EHU lid hardware kit (PN 72-
0054-01). The first step involves attaching the lid and gasket with the 3 screws, nuts, and wash-
ers shown in Figure 5.11. The flat washer needs to be placed between the screw head or
nut and the plastic element housing. The second step is to attach the EHU to the boom with
the remaining 7 screws, as show in Figure 5.12. Both of these figures can be found on the fol-
lowing page. Do not over tighten the bolts/nuts or you risk damaging the EHU shell. Wait
15 minutes then tighten them again.
WARNING: When assembling the lid to the housing unit and the housing to the boom, make
sure the control cable is not being pinched or damaged in any way. This can cause a short and
drastically effect the performance of the antenna.
Once the lid is mounted place the flat side of the element housing unit (EHU)/lid assembly on
top of the element to boom brackets. The housing without the SO-239 coax connector is the
director, the one with the SO-239 connector is the driven element (the balun is on the inside of
this housing). The driven and director elements should be positioned so the actual fiber-
glass element are the furthest away from each other. Fasten each element housing to the
element bracket, using seven 10-32 x 7/8” screws, flat washers, Nylock nuts and tighten. The
flat washer needs to be placed between the screw head and the plastic element housing.
Warning: Tighten the element housing unit screws securely, but not too tight (if you over-tighten
the nut, you may split the plastic flange on the element housing). Wait 15minutes then
tighten them again.
The dark gray element support tube (EST) on each antenna housing will appear uneven in
length - it is actually centered on the inside of the antenna housing.
Note: The driven element and return tube will have the EST (offset tube) lined up so that the
short side and long side of the EST/return tube are facing in the same directions. The
director element EST configuration will be the opposite. This is normal.
ATTACHING THE EHUS TO THE ELEMENT BRACKETS
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