Hughes DIRECWAY AN4-074-DF - Manual (Page 39)

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