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Chapter 4 - Cross Polarization of the Galileo System

 
 

Once you have completed the CPE installation wizard, and have looked at the administrative screens to tweak your pointing for the best signal strength, you now need to perform the Cross Polarization test with the Network Operations Center.

With the gateway and laptop turned on (and connected), call the Network Operations Center. The number is provided to you on the Work Order.

The first thing you will need to do is give them the TAP ID of the modem, which is located on the work order. All information they might require is on the work order as well, be sure to have it with you.

The NOC operator will ask you to move the azimuth, elevation, and skew of the dish. The "skew" is the amount of rotation of the transmitter, LNB, and Feed Horn. The point of crosspol is to demonstrate that this system can be online without introducing errors into the network and without harmfully interfering with any other unit's transmission to the satellite.
When adjusting Elevation and Azimuth, use only the fine adjustment screws.

When crosspol is completed, the NOC agent will give you permission to lock down the dish. You will remain on the phone with them while they do this, so the NOC can make sure the dish doesn't move.

First, lock down the radio bracket, as shown.

Next, lock down the 4 elevation bolts. There are 2 on the right, and 2 on the left.

Finally, lock down the 3 Azimuth bolts.

When this is completed, the system will be activated on the network and you will be able to finish the installation.


Calling After Hours

Sometimes, you will be calling Intelsat directly. This process is only a little different than that listed above. Their phone number can be found on your work order.

It's okay to go back into the wizard after you've pressed the "Commit" button, to do the crosspol test. Get to this screen, then check the "Conduct Cross Polarization Test" box, and click "next"

At this screen, the NOC Operator will give you a frequency number to type in. In this example, it's 14100. Type this number in the "MHz" field, then click on "Start"

A very common cross-pol frequency is 14118.1

You will now follow the same procedure as that outlined above for peaking the dish.

     

After the cross-pol is complete, and you have locked down the dish, DO NOT COMMIT the installation a second time. Simply click on "Cancel" and exit the installer.

It may be a good idea not to water-proof the coax connectors until after you have passed cross pol. Sometimes, you may be asked to switch cables, or do something that requires you to be able to remove them from the dish or the Gateway IDU.


 
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