Because of the shim’s alignment pins, you must rotate the TRIA 90° from its horizontal polarization position. You must rotate the TRIA before you re-attach the waveguide end so you can insert the shim alignment pins into the waveguide end plate. See Figures 21 and 22.
Figure 21: Direction of TRIA rotation for vertical polarization
Chapter 3 • Installing the radio and antenna assemblies
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