How To Calculate Clearance for Vertical Obstacles

[Hyper]

How To Calculate Clearance for Vertical Obstacles (trees, buildings, etc..), when installing a Satellite Dish.

Credit to Michael Kilgore at FTAList.com. An old friend of mine. He wrote this in his 2007 FTA Pocket Guide. I just found it digging through old stuff.


How much can you clear?


With a little trigonometry you can determine how far back you need to be from any vertical obstacles (trees, buildings, etc) in your dish's line of sight.

It all depends on the elevation angle.

For every 10 feet of horizintal distance, you can clear this much vertical height:


15 degrees - 2.6 feet
20 degrees - 3.6 feet
25 degrees - 4.6 feet
30 degrees - 5.7 feet
35 degrees - 7.0 feet
40 degrees - 8.3 feet
45 degrees - 10 feet
50 degrees - 11.9 feet
55 degrees - 14.2 feet
60 degrees - 17.3 feet


Example:

If your elevation angle is 35 degrees and the base of a tree thats in the way is 60 feet away, you can clear the tree until it is (6 x 7.0) or 42 feet high.

If you mount your dish high, as when on a roof, you can add that height. Using the previous example, if your dish is mounted 15 feet off the ground, you can clear the tree until it is (42 + 15) 57 feet high.



 

[Tadpol53]

thanks hyper i will add this to my favs list for future referance when setting a dish on my laptop which i take with me and use outside with my MIFI 2200 card so i can check sathint for proper adjustments on the lnb for transponders along with a receiver and 13" tv TP53

[Hyper]

You are welcome. I put it here so i know where to go to get it myself.

Next time someone wants to know about clearing obstacles, i know right where to go to check.