Antenna hight

[tobydude2]

Hi.
Have a Radarbox and are sharing traffick.

Question:
How longer range will I get if I increase the antenna length with 2 meter?
There is a mountain here that block the antenna.
Is there any point in increase with 2 m?

https://www.radarbox24.com/stations/PGANRB500195

[Runway 31]

I presume your mountains block to the north.  The 2 meters would probably make some difference but don't expect to much as your coverage in the other directions is very good.  If you can get it higher without much problem, go ahead.

Alan

[abcd567]

Use the method described in the post linked below.
Prepare two plots:
(1) Using current antenna height
(2) Using current antenna height + 2 meters

Comparing the two plots will give you an insight.

    
What is the Maximum Range I can Get?


.

[tobydude2]

I presume your mountains block to the north. 

Alan

Yes, mountains are to the north, as the coverage map shows.
Antenna already a bit high for norwegian weather conditions. :)

[tobydude2]

Use the method described in the post linked below.
Prepare two plots:
(1) Using current antenna height
(2) Using current antenna height + 2 meters

Comparing the two plots will give you an insight.

    
What is the Maximum Range I can Get?


.

Thanks. Will look into it ans see if it is any point making it longer. :)

[tobydude2]

Use the method described in the post linked below.
Prepare two plots:
(1) Using current antenna height
(2) Using current antenna height + 2 meters

Comparing the two plots will give you an insight.
What is the Maximum Range I can Get?


.

Unfortunately  it does not cover my erea.

[wiedehopf]

Let's say your obstacle is 1 km away.

Because of the obstacle your current range in that direction is 100 km for aircraft flying at 10 000 m

That means the obstacle is 10 000 m / (100 km / 1 km) = 100 m higher than you.
Now if you increase your antenna height by 2 m it is 98 m higher than your.

Now your range is 102 km.

That calculation ignores curvature of the earth but it should give you a rough idea in what ballpark any improvements might be.

If you have obstacles close in antenna height will make a much bigger difference. (Or if it is already very flat around you)

[tobydude2]

That calculation ignores curvature of the earth but it should give you a rough idea in what ballpark any improvements might be.

If you have obstacles close in antenna height will make a much bigger difference. (Or if it is already very flat around you)

Thank you.
Thas usful to know. Will calculate...

[abcd567]

tobydude2

It is too bad that the heywhatsthat site does not cover your area. The heywhatsthat site is a very handy and fairly accurate site.

You can still calculate using the formula given in this sketch which I have drawn couple of years ago.
This is based on assumption that area around you is level ground, and not hills.

The image is very wide. Scroll right to see it in full

[tobydude2]

Hi.
Yes, massage from The heywhatsthat say: "Invalid Latitude. (my latitude, 68N) We currently cover latitude
60N to 54S and most of Alaska".

Thanks for the formula. Will look into it.
I´v tried heywhatsthat for an erea south in norway, just to see how much longer range 2m antenna increase  gives.
Its not much. :)

[abcd567]

I´v tried heywhatsthat for an erea south in norway, just to see how much longer range 2m antenna increase  gives.
Its not much. :)

That is expected with a level terrain.

With hills around, the improvement will be more but still not much.

With large trees or houses around the improvement will be much more, and if the antenna is raised above the height of the tall trees & buildings, improvement will be really great. Some years ago I have made a sketch to demostrate this. It is attached below.

The image is very wide. Scroll right to see full image

[tobydude2]

I have the antenna mounted on a pole, to get over the nearest rooftops and trees.
Its the mountains in the nort, that are det "issue". :)



Mountains north