obstruction to satellite

how far away does an obstruction have to be for signal not to be picked up on a dish. Say a house thats about 30 metres away from the dish, would this cause issues.

Your dish needs to be twice the distance away from the height of the obstacle.eg; if tree is 10mts high the dish needs to be 20mts away at ground level,if you raise dish by 5mts you only need to be 10 mts away.



Thanks to dick b

manic01 said:

Your dish needs to be twice the distance away from the height of the obstacle.eg; if tree is 10mts high the dish needs to be 20mts away at ground level,if you raise dish by 5mts you only need to be 10 mts away.



Thanks to dick b

Click to expand...

am I correct in thinking your calculation is based on dish being on the ground level...so if the dish is say 30 metres high from the ground, the obstruction has to me 20 metres away

If the dish is 30 mtrs high, there will be no obstructions unless you are few feet from a block of flats lol

Twice as far away as obstacle is high working on dish is at ground level.
If the obstacle is 30 mtrs high you need to be 60 mtrs away minus the height of dish. so if dish is 5 mtrs high the obstacle is really only 25 mtrs high and you need to be 50 mtrs away.

Also depends what satellite you are pointing at as when you get round to say 39e the dish is dipping.

I assume it will also depend on your latitude? Eg the closer to the equator you are the higher the dish elevation angle?

looking at pointing to 0.8 W

Use the Tan equation.

Angle = Elevation angle (relevant to satellite). 31 in this case
Opposite = Difference in height between top of obstruction and bottom of dish. If bottom of dish is 2.5m and top of wall is 7m, then use 4.5m.
Adjacent = Distance to obstruction.

I am in West Yorkshire just waiting on my 1m dish to arrive then will set it up

Use the Dishpointer app with the obstacle checker: