156 Messages

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2.4K Points

Wed, Aug 9, 2017 6:04 PM

# Wireless Interference from Trees?

Hi,

maybe a stupid question...
How difficulty is a Tree (thickly overgrown) for a wireless Signal?
I have to plan a Mesh Link between two T300 Unleashed.
There are some (2 or 3) Trees (not a forest) between APs. Because the Pole (about 8 Meters) is not high enough the Tree still is in my way.

What do you think?
No Problem? Huge Problem? Just Trying? Give a T301s a try?

Thanks.
KR
Marco

#### Responses

7 Messages

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160 Points

3 years ago

You should base the design of your link in the Fresnel zones.

Http://www.digitalairwireless.com/wireless-blog/recent/fresnel-zones-what-are-they-and-why-are-they-...

156 Messages

•

2.4K Points

3 years ago

Thanks.
Ok. So i should keep the fresnel zone clean.
I think the Fresnel zone can be calucalted? Maybe i should look for an online Calculator.

Using a "stronger" or more directional Wireless Antenna may also help???
I ask because it's easier just to use a more directional 120° Degree Antenna (T301s) instead of cut down the Trees or increase high of the pole. :-)

7 Messages

•

160 Points

3 years ago

Yes, I think it could help, though, I think the most important thing would be to keep the fresnel zone at least 60% clear.

I will try to explain how to calculate the area easily without an online calculator.

The equation that you must use is the following:

r=17.32(meters) x √d÷4f

r=72.05(feets) x √d÷4f

where, r=size of the first fresnel zone, d= distance between your antennas (kms) and f= frequency (Ghz).

Therefore, the radius of the first fresnel zone must not be less than the result of your equation

I hope this helps you and I hope I have explained it correctly.

Regards...