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Page 53
CHAPTER EIGHT
SECTION 8.3
MAST PLATE AND DOUBLE TRUSS (continued)
The double truss system provides vertical loading support, as well as side-to-side support. There are two
components that make up the framework of the system, the 48 inch truss mast, which was installed in the
prior step, and the 36 inch truss boom. It is critical that the that the truss boom be mounted perpendicular
to the antenna boom with the location on the side of the truss mast that will place the truss boom above
the antenna mast as shown in
figure 8.30
. This allows the truss system to be balanced.
The best way to install the truss mast plate on the truss mast, is to loosely attach the saddles and then slide
the mast plate onto the mast. Locate the truss mast plate (PN 10-1021-43). Insert four 5/16” x 3-1/4”
hex head bolts (PN 60-0075 ) and attach one half of the 1.75” aluminum saddles (PN 10-1601-03) and in-
sert the 5/16” x 3-1/4” hex head bolts as shown in
figure 8.31
. Attach the other half of the saddles onto
the bolts and loosely thread on the 5/16” Nylock nuts (PN 60-0046) as shown in
figure 8.32
.
Slide the loose saddles over the truss mast so that the top edge of the plate is level with the top edge of the
pipe as shown in
figure 8.33
. Tighten the saddles evenly, so that the gap between the two saddles is the
same on each side. Be sure to install the set screws and tighten them as shown in
figure 8.33
.
ATTACH THE TRUSS MAST PLATE TO THE TRUSS MAST
ANTENNA MAST
GOES HERE
FIG. 8.33
FIG. 8.32
FIG. 8.30
FIG. 8.31
