The considerations of the skew

[마틴신]

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When you install a new dish antenna to pick up a signal from a satellite what you want,

you need to know the Azimuth,Elevation and Skew to acquire the signal and align the your antenna at the location where you are going to install.

The skew is one of important thing with dish antenna alignment  to get best signal strenght and quality.

So let me explain the reason why does it need and how to adjust the skew.

When you install a Dish antenna,  it is really important that the dish mast is plumb, that is,

exactly perpendicular to level - this is best achieved using a carpenter's level.

But viewing form the satellite, your antenna has a little tilts to the right or left hand side,

even you made it level so the dish mast is plumb.

Why ?,  because the earth is round.

Let's see the picture as bellow

From the location 'P', looking for the broadcasting satellite, named 'Koreasat3' is exactly to the south in the sky.(116.0 E)

As you see above , the antenna 'K' is sitting down on a place in korea and has a little tilt.

Let's send a vertical linear polarization signals from the satellete to the both dish antennas on the earth and watch what happen.

In the case of antenna 'P', the signal that is sent from satellite matched up with the antenna P.

But the antenna K does not, the signal is mis-matched as you see in the above picture.

So you need to rotate the your LNB to the counter clock wise(ccw) to match up in this time(front view form the dish)

When you set the skew of your LNB you are lining up your dish exactly to the same horizontal/vertical position as the satellite in the sky. When standing in front of your dish, rotate the LNB counter-clockwise for a + skew value or rotate the LNB clockwise for a - skew value. Ku band satellites use horizontal and vertical linear polarization and so the skew has to match the (H/V) position of the satellite for optimum satellite signal strength and quality.

Is it helpful for you?

I will thank you for any information about the skew.

Written by Martin Shin

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[hisaka]

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