Hughes AN4-074-DF Manual Do Utilizador

 

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. 

Figure 19 shows where the shim is located and shows three of the 
four Allen screws that hold the shim in place. 

To replace the horizontal shim with a vertical shim, follow these 
steps:

1. Obtain a vertical transmit polarization shim kit (HNS model 

VTX-SHIM-KIT, P/N 1033809-0001).
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.

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:  Shim location next to TRIA

TRIA

Shim 

 

(See also 
Figure 20.)

Allen screws 

(4 total)

Waveguide