Hughes AN4-074-DF installation manual Remove the horizontal shim and O-ring

Figure 20 illustrates the difference between the horizontal shim and vertical shim. Note the positions of the alignment pins.

TRIA

Horizontal shim in place

O-ring

Alignment

pins

Vertical shim in place

(In this photograph, the TRIA

has not yet been rotated.)

Alignment pins

Horizontal shim Vertical shim

Figure 20: Horizontal shim and vertical shim for transmit polarization

4.Remove the horizontal shim and O-ring.

5.Install the vertical shim and O-ring in the same location. Because of its shape and alignment pins on the transmit/receive isolation assembly (TRIA), the vertical shim can only be installed in the position shown in Figure 20 (upper right photo). Note the position of the alignment pins. Likewise, the horizontal shim can only be installed in one position.

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Chapter 3 • Installing the radio and antenna assemblies 1035567-0001 Revision A