EchoStar HUGHES JUPITER AN9-098-G, Руководство по установке

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Chapter 3 • Installing the antenna and radio
1039740-0001 Revision B
37
Figure 19: Determining the polarization setting of the radio
3. Compare the existing setting with the required setting you obtained in
Determining the pointing values and polarization setting on page 25. If the
polarizer is already set to the proper setting, skip the rest of this section and
proceed to
Installing the antenna assembly onto the mast on page 38.
4. If the polarizer is not set to the required polarization, follow the steps in
Changing polarization .
Changing polarization
Note: Follow the instructions in this section only if you need to change the
transmit circular polarization setting.
To change the polarization, reposition the polarizer as follows:
1. Using a 3 mm ball-end hex wrench, remove the four screws that secure the
feed horn to the radio.
2. Separate the feed horn assembly from the radio and reposition it so that the
marker on the base aligns with
L label on the radio for LHCP, or R for RHCP.
If the O‐ring comes out of the feed horn groove, make sure it is properly
reseated and that the blue mark is visible, as shown in
Figure 20
on page 38
before reinstalling the feed horn assembly on the radio.
The O-ring prevents moisture from accessing the waveguide and the radio.
It
must be properly seated.