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Online software for line of sight
- Thread starter Bonkk083
- Start date
Does it have earth curvature
Earth Curvature Calculator
The Earth curvature calculator lets you find the distance from you to the horizon, as well as the height of an object that is partially hidden behind it.
www.omnicalculator.com
This one calculates curvature by distance and height, but think you have to combine the answer you are looking for
Using the earth curvature calculator my distance to the tower in Huntsville, Tx is 23 miles, my antenna is at 18 feet, Huntsville antenna at 189 feet, the lowest point I can see is 211.403 feet, therefore I use a yagi antenna for my inside scanner on 800mhz.
The surrounding area includes parts of the Sam Houston National Forest and is heavily forested. The Huntsville tower only has a radius of 30 miles, so 15 miles in any direction. My location on the attached map is the red dot on the west side of Lake Livingston. So you can see being on the fringe and all the trees really knocks down the signal, hence the yagi.
Attachments
Radius is equal to half the diameter of a circle. So if the radius is 30 miles then the diameter (total coverage) is 60 miles. So technically speaking two radios that are 30 miles from the repeater tower in opposite directions will be 60 miles apart.
You are right, I should have put a radius of 15 miles for a diameter of 30 miles, which is the correct distance. I am 8 miles outside that radius of 15 miles.
The other thing to remember about the site range is that it is designed for MOBILES not PORTABLES.
You most likely won't get into the repeater with a HT or mobile. There is a good chance that you can get into the repeater with a base station and a good antenna with enough height and a clear line of sight.
There is a GMRS repeater 33 miles away from me and I am 14 miles outside of its range. I can sometimes get into it with my 50 watt base station depending on atmospheric conditions. My GMRS antenna base is 20 foot above ground.
And sometimes even if you are within the repeater's range, you might be able to hear the repeater but have a hard time reaching it while transmitting with a 5 watt HT.
My local repeater tower is 21.5 miles from my house which currently has 2m and 70cm repeaters. The 2m repeater has a 80 mile radius and I can get in with a 5 watt HT with no problems. I am not sure on the 70cm repeater radius but I cannot get into it at all with my 5 watt HT. The tower is 900 foot tall.
nd5y
Member
Put one station on Pikes Peak, CO and another station on Mount Washington, NH and see if there is a line of site path. If there is then it doesn't calculate the earth's curvature.
dickie757
Wired
@nd5y I did one like that...Mt. Spokane to Grey Butte in Oregon. No curve. I will edit this post with a known good curvature app from ubiquiti.
Of course it was years ago, but I found a los calculator that included distance of a heading off a peak or point to the horizon. The path I mentioned was 359ish miles, Grey has a 110ish mile horizon, and Mt. Spokane has 100ish mile to horizon. Curve accounted for missing 149 miles.
Here we are....
ispdesign.ui.com
Of course it was years ago, but I found a los calculator that included distance of a heading off a peak or point to the horizon. The path I mentioned was 359ish miles, Grey has a 110ish mile horizon, and Mt. Spokane has 100ish mile to horizon. Curve accounted for missing 149 miles.
Here we are....
UISP Design Center
Your all-in-one suite for network planning and profitability tracking
dickie757
Wired
First link in post 2 doesnt work
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