LNB Skew Adjustment: Polarization for Best Reception

Look at any row of satellite dishes on a skyline and you will see the LNBs rotated at slightly different angles. That rotation is the LNB skew — and getting it right matters, especially if you are far east or west of the satellite.

Why Skew Exists

European satellites broadcast signals in horizontal and vertical polarity. But because the dish sits on the curved surface of the Earth, the satellite is not straight overhead — it is down at an angle, off to one side. The LNB's internal probe must be rotated to match the incoming polarity. That rotation is the skew.

How Much Skew?

A satellite pointer app tells you the exact skew for your location and satellite. In central Europe for Astra 19.2°E it is often a small positive angle; further east or west, the skew grows. At the satellite's longitude directly, skew is zero.

Does It Really Matter?

In the centre of the footprint, a few degrees of skew make little difference. But at the edge of coverage, or when receiving weak transponders, correct skew can be the difference between a locked picture and pixelation.

How to Adjust Skew

1. Loosen the LNB clamp just enough to rotate the LNB.
2. Set the rotation to the angle from your app.
3. Tune a channel and watch the quality meter.
4. Rotate the LNB slightly — a degree or two at a time — to peak quality.
5. Re-check the dish peak; skew and dish angle interact.
6. Tighten the clamp once both are peaked.

When Skew Gets Especially Important

• You are far east or west of the satellite.
• You are using a motorised DiSEqC system — skew should be set once for the due-south reference and left.
• You are receiving 4K channels, which need clean carriers.

Common Mistakes

• Rotating the LNB by eye rather than using the meter.
• Overtightening the clamp and cracking the LNB body.
• Forgetting that skew and dish peak interact — do them alternately.

Skew is the last 10% of alignment that separates an “okay” picture from a rock-solid one. Once you have peaked the dish, spend two minutes on the skew — the quality bar will thank you.