Installing a shim for vertical transmit polarization
Follow the instructions in this section only if installation specifications or a service order states that vertical transmit polarization is required.
If vertical transmit polarization is not required, go to Installing the radio assembly on the feed arm on page 25.
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 arm, you will have to remove the radio assembly from the feed arm before you can follow the instructions in this section.
Figure 19 shows where the shim is located and shows three of the four Allen screws that hold the shim in place.
TRIA
Shim (See also Figure 20.)
Allen screws | Waveguide |
(4 total) |
|
Figure 19: 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 (HNS model
Figure 20 on page 22 shows what a vertical shim looks like.
2.Loosen and remove the four Allen screws that hold the shim in place. See Figure 19.
3.Separate the end of the waveguide from the shim.
Chapter 3 • Installing the radio and antenna assemblies
21
