Calculator Inputs
Example Data Table
| Location | Latitude | Longitude | Satellite | True Azimuth | Elevation | Skew |
|---|---|---|---|---|---|---|
| New York, NY | 40.7128° | -74.0060° | 119°W | 236.88° | 24.50° | -39.41° |
| Dallas, TX | 32.7767° | -96.7970° | 119°W | 217.01° | 44.98° | -30.41° |
| Los Angeles, CA | 34.0522° | -118.2437° | 110°W | 165.49° | 49.44° | 11.98° |
| Miami, FL | 25.7617° | -80.1918° | 61.5°W | 142.10° | 53.37° | 33.59° |
Formula Used
The calculator treats the selected satellite as a geostationary satellite above the equator.
Longitude difference: Δλ = satellite longitude − site longitude.
Earth ratio: q = Earth radius / geostationary radius ≈ 6378.137 / 42164.
Elevation: atan2((cos φ × cos Δλ − q), √(1 − (cos φ × cos Δλ)²)).
True azimuth: atan2(sin Δλ, −sin φ × cos Δλ), normalized to 0° through 360°.
Magnetic azimuth: true azimuth − magnetic declination.
LNB skew: atan2(sin Δλ, tan φ) + LNB offset.
Clearance angle: atan2(obstacle height above dish, obstacle distance).
How to Use This Calculator
Enter your site latitude and longitude. Choose the correct north, south, east, or west direction.
Select a Dish orbital slot. Use custom longitude when your receiver lists another slot.
Enter magnetic declination if you want a compass bearing. Use east as positive and west as negative.
Add obstruction details when trees, walls, or buildings may block the dish path.
Press the calculate button. Read the result directly under the header. Then set azimuth, elevation, and skew.
Use the CSV or PDF button to save your installation values.
About Dish Network Satellite Aiming
A satellite dish must face the correct point in the sky. Small errors can reduce signal strength. This calculator gives practical aiming values before you touch the mount. It uses your latitude, longitude, and selected orbital slot. It then estimates true azimuth, magnetic azimuth, elevation, skew, and range.
Why Accurate Aiming Matters
Dish alignment is not only about turning the reflector left or right. The dish also needs the right upward angle. The LNB may need a skew adjustment too. These values help the receiver separate signals from the satellite. Good pointing can reduce pixelation, dropouts, and slow channel scanning. It can also save time during roof, wall, or pole installation.
Useful Planning Details
The true azimuth is measured from geographic north. The magnetic azimuth is the compass direction after declination correction. Elevation is the upward angle from the horizon. Skew describes the LNB rotation needed for polarization. Slant range estimates the straight distance to the satellite. The line of sight check reminds you to avoid trees, walls, buildings, and hills.
Field Setup Advice
Start with a solid mast. Make it perfectly plumb. Tighten the base before adding the dish. Set the elevation scale first. Then rotate the dish toward the magnetic azimuth. Move slowly while watching the receiver signal meter. Peak the signal with tiny left and right movements. Then adjust elevation in small steps. Finish by checking skew and tightening all bolts.
Result Limits
The calculator gives a strong starting point. Real installations can still need fine tuning. Mount flex, local magnetic objects, bracket markings, and receiver settings can affect results. Do not rely on a phone compass near metal. Use safe ladder practice. Avoid power lines. Confirm the satellite name and orbital slot with your receiver menu. Recheck all numbers before final tightening. Always weatherproof outdoor cable connections. Use approved grounding where required. A patient setup usually gives the best signal.
Advanced Use
Advanced users can compare several orbital slots. This is helpful when checking Western Arc and Eastern Arc options. Change the satellite longitude and submit again. Compare elevation first. Very low elevation can be blocked more easily. Higher elevation often gives a cleaner path. Keep notes for each onsite test.
FAQs
What is satellite azimuth?
Azimuth is the left or right aiming direction. It is measured in degrees from north. A value of 180 degrees points south.
What is elevation angle?
Elevation is the upward angle from the horizon. A higher value means the satellite appears higher in the sky.
What does LNB skew mean?
LNB skew is the rotation of the feed assembly. It helps match the satellite signal polarization and can improve signal quality.
Should I use true or magnetic azimuth?
Use true azimuth for maps and surveyed references. Use magnetic azimuth when aiming with a compass after adding declination.
Why is magnetic declination important?
Magnetic north and true north are not always the same. Declination corrects the compass bearing for your area.
Can trees block the dish signal?
Yes. Trees, buildings, hills, and walls can block the line of sight. Use the obstruction fields for a quick clearance check.
Is this calculator enough for final alignment?
It gives a strong starting point. Final alignment should be peaked with the receiver signal meter or a satellite meter.
Which Dish satellite should I choose?
Choose the orbital slot shown in your receiver setup menu. Common slots include 61.5, 72.7, 110, 119, and 129 degrees west.