Over Trees - Virtical or Horizontal Polarity

[rafamous]

What would you say the best way to shoot across the top of a long stretch of trees would be?

Vertical or horizontal polarity?

Thanks.

[tkerns]

When I have trees or other structures encroaching in the fresnel zone, I find Horiz. polarity to give the best performance. I have also seen horiz polarity to perform much better when shooting across a tin roof. This is just my observed experience and no sicentific testing.

Tim

[lonnie]

Lots of height.

Sorry, but that is the BEST way and you asked for it. Failing that Horizontal has worked best for us, even going through some trees.

What would you say the best way to shoot across the top of a long stretch of trees would be?

Vertical or horizontal polarity?

Thanks.

[sligbot]

We've got a complete NLOS link that is about 4 miles or so but it's a point to point. Goes through a couple of real dense bushes too but we get a solid -67 with both 24dBi grids on horizontal. We've found performance to improve with horizontal through trees, but there's no law about what to expect in terms of performance when you're going through trees.
--Rich

[Ick]

Are we talking about 2.4 or 5.8, or is it the same for both?

[lonnie]

We see the same results, with Horizontal being better when trees are involved.

[rafamous]

Thanks for the input.

Currently I have a 2.4 link going across some trees using horizontal polarity and am upgrading this link to 5.8.

Just wanted to ask the years of experience on this fourm before I made the changes.

[oscarBravo]

5.8 suffers more from path loss if there are actual obstructions, but the good news is that the fresnel zone is a lot smaller.

[sligbot]

Absolutely true. 5.8 really doesn't perform where there are trees -- whether it is done horizontally or vertically. If you want some decent NLOS performance, go with 2.4 horizontally but make sure you've got some pretty high gain antennas otherwise it'll be a waste of time.
--Rich

[rafamous]

The link is probably 12 miles.

One end is a 125' grain leg the other end is a 350ft building but down in kind of a hole.

I do have line of site but just over the trees on a ridge.

I would love to get the speed of 5.8 but I need it to be stable. With the info there's less fresnel to deal with on 5.8 it just might work.

The link is made with 2.4 right now but about every other day at exactly the same time it drops off and if I change the ssid, reboot, and then change the ssid back the link will reconnect. Dunno??

Seems like interference to me, another reason I want to change frequencies.

I have ordered 2 29db dishes from pacwireless using the wlm54 I think it should push through using horizontal polarity, hopefully.

This link has been a struggle for me now for over 3 years. I am now upgrading all my backhauls to 5.8.

Anyone know how the new 900mhz does over long hauls, does it act pretty much like 5.8 on speed?

[go.fast]

You should try it. I have a 5 gig shot that I can not see the water tank ap from, but it's nearly perfect. maybe 5 miles or so.
I can't see the water tank, just treetops. the tree tops are in the middle of the shot.

I also have a couple links that have a tree off in the near distance that is partially in the way. Not a full thick tree. And they're good as well.

cm9's default power. big 5gig rootennas at the cpe small 5 gig rottennas at the ap.

George

[rafamous]

I finally got this link completed with great thoughput.

12 miles
Shooting just over trees on a high ridge and a lake

I used pacwireless 29db 5.8 dishes.

Horizontal polarity

War2 on both ends. In the future I will upgrade to the metro.

-72 signal x4 cloaking

Thanks for the help guys.

[wirelesseye]

Good to hear, we have 12 of the 32dbi dishes from pac wireless and they work great.

We actually have (3) 5Ghz links going over 1 mile, each link is going through at least 15-20 old growth trees. We are seeing -68 on average with Star V2 (so no cloaking) with these links, but then again, we are using expensive multipath antenna's on all of the links.

[Ick]

Good to hear, we have 12 of the 32dbi dishes from pac wireless and they work great.

We actually have (3) 5Ghz links going over 1 mile, each link is going through at least 15-20 old growth trees. We are seeing -68 on average with Star V2 (so no cloaking) with these links, but then again, we are using expensive multipath antenna's on all of the links.

Define "expensive multipath antenna's." Who's are you using?

[rafamous]

Yeah I would like to take a look at those also.