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Installing a shim for
vertical transmit
polarization
Chapter 4 • Installing a J-type radio assembly
32
1037312-0001 Revision A
Follow the instructions in this section only if the installation
specification or service order states that vertical transmit
polarization is required. (The vertical shim kit is not used with
the cradle-type radio.)
If vertical transmit polarization is not required, go to Installing
the radio assembly on page 36.
The radio assembly is shipped with a horizontal transmit
polarization shim installed. If vertical transmit polarization is
required, you must remove the horizontal shim and replace it with
a vertical transmit polarization shim.
Note: If you need to change from horizontal to vertical transmit
polarization on an antenna that has the radio assembly already
installed on the feed support tube, you will have to remove the
radio assembly from the feed support tube before you can follow
the instructions in this section.
Figure 23 shows where the shim is located and shows three of the
four Allen screws that hold the shim in place.
Allen screws
(4 total)
Figure 23: Shim location next to TRIA
To replace the horizontal shim with a vertical shim, follow these
steps:
1. Obtain a vertical transmit polarization shim kit (Hughes
model VTX-SHIM-KIT, P/N 1033809-0001).
Figure 24 on page 33 shows what a vertical shim looks like.
2. Loosen and remove the four Allen screws that hold the shim
in place. See Figure 23.
3. Separate the end of the waveguide from the shim.
TRIA
Waveguide
Shim
(See also
Figure 24.)
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