am i getting the max from my 1.2m cm

iwol

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hi could anyone please do some quick calculations for me please to see if i am getting a signal on my full dish face, the lowest incoming angle at my position would be about 21 degrees,the dish faces the obstacle square on at about 7w,ive done some calculations but wondered what anyone else thought, i know the obstacle is 2.8m tall but the bottom of the dish is 65cm making the obstacle 2.15m in theory with a distance of 4.3m from dish to obstacle thanks iwol
 

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Topper

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Do we assume offset dish?, if so what is the focal length?
 

iwol

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hi topper its a 1.2 channel master off set dont know the focal length
 

rolfw

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If you draw it to scale and use a protractor, you should be able to measure the angle at the bottom of the dish and compare this to the angle given by the calculator downloadable at www.smw.se
 

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iwol

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is there a small program to do this for you:)
 

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There is probably an equation for doing it, as it is a right angled triangle and given two side dimensions, you should be able to work out the angle, but I have no idea of how to do it, as it is too many years since I was at School.

All you need is a protractor to work it out, it is a doddle if you have one.
 

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tan(theta) = sin(theta) / cos(theta) = a / b
 

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iwol said:
hi could anyone please do some quick calculations for me please to see if i am getting a signal on my full dish face, the lowest incoming angle at my position would be about 21 degrees,the dish faces the obstacle square on at about 7w,ive done some calculations but wondered what anyone else thought, i know the obstacle is 2.8m tall but the bottom of the dish is 65cm making the obstacle 2.15m in theory with a distance of 4.3m from dish to obstacle thanks iwol


Hi The minimum elevation you will be able to see without blocking some of your dish is 26.56 degrees.

--tan (theta)= 215/430. (opposite/adjacent)

therefore, theta = inverse tan (215/430)
= 26.56 degrees

cheers
Robbo
 

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Dead right "Robbo71, basic trig.
Parky
 

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thank you guys:)
 

iwol

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just managed to find the perfect progam to do this its at _www.satlex.net/en/elobst_calc.html hope it helps anyone
 

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iwol said:
just managed to find the perfect progam to do this its at _www.satlex.net/en/elobst_calc.html hope it helps anyone

Other useful information on that site too. Thanks iwol.
 

rolfw

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Here's another one, with a lot more calculators for everything satellite _http://www.satellite-calculations.com/
 
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