Linear LNB skew/tilt/polarization

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noffke3000

noffke3000

Thread Starter
New Member
Jan 14, 2010
3
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Huntsville, AL
Ok, so I'm relatively new to satellites and have been tasked with writing a small PC app to calculate all the angles somebody would need to set up their dish. I've been able to find equations for Az and El and confirmed their accuracy but have been unable to find how to actually calculate the angle that the LNB needs to be tilted, skewed, or whatever you want to call it. I know there are a few sites that will calculate it for you, but the users of my app may not have the luxury of an internet connection and I need to be able to provide that functionality for them.

Short of learning spherical trigonometry, I've turned to forums to help answer my questions.

Can somebody fill me in on the equations that I can use to calculate this angle?

Thanks in advance!
 
L

Lak7

SatelliteGuys Master
Pub Member / Supporter
Feb 28, 2008
5,451
7
Near Chicago, Illinois
This page may help....
datastormusers.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=3;t=000381;p=0
 
noffke3000

noffke3000

Thread Starter
New Member
Jan 14, 2010
3
0
Huntsville, AL
This page may help....
datastormusers.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=3;t=000381;p=0

I haven't fully checked this out, but on the surface and with a few quick calculations it looks good! You are the man! thanks.:up
 
Anole

Anole

SatelliteGuys Master
Sep 22, 2005
11,819
13
L.A., Calif.
Is this an exercise for school, or is there some other reason to re-invent the wheel? - ;)
Here is Satfinder, a Java application that's been around for quite some time.
I use it often to do my calculations, and it's stand-alone.
 
noffke3000

noffke3000

Thread Starter
New Member
Jan 14, 2010
3
0
Huntsville, AL
not for school. I'm writing an Windows App that does the following...
- walks the user through instructions on setting up the satellite modem and antenna, like a user's manual with pictures, definitions, etc
- in addition it also programs setup information based on location, the satellite, and frequencies into the modem through a serial port
- and lastly it also calculates all the angles needed to acquire or find the bird in the sky.

This is really my first foray into satellites, so it's been interesting for me to learn a little something about the technology.


Why have different tools to do this, when they'll pay me to create one?
 
C

classicsat

SatelliteGuys Pro
Nov 28, 2009
195
0
Ontario, Canada
I made a spreadsheet to do some playing, and basically stole the formula from a java applet from the web.
 
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