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3. Assemble and Attach Shield Place the reflector facing upward with the aid of a crane. First, carefully raise the reflector so that it rests on the rim. Then carefully lower the reflector so that it rests on wooden supports placed under the antenna mounting ring. Place wooden braces as needed to hold the reflector in a stable position. Loosely assemble the shield sections on the ground as shown in Figure 2. The ends of the shield ring on each section have marks that must be matched as the sections are joined; that is, A to A, B to B, etc. Start the assembly of two overlapping sections with two bolts near the shield flange and the splice block bolt at the |
shield ring. Then add the remaining bolts along the overlap.
Have four men lift the shield and position it on the reflector so that one of the two red tapes on the shield aligns with the red tape on the reflector rim as shown in Figure 3. This marking indicates the top of the antenna. Note: The shield width is not uniform and is maximum at one of the section joints. This is called the high point of the shield. When dual waveguide feeds are installed, they are positioned with their waveguide feeds bends in the horizontal plane on either the left or right side of antenna center. The high point of the shield must then be on the |
