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rajeshrouthu
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60km wireless link

Tue Jan 27, 2009 12:24 pm

i need to setup 60 km p2p wireless link with RB 411 + R52+29 db parabolic dish or grid antenna..it can enough..??? please send some best technical details

Thanks'

Regards,
Raj
Regards,
Raj
 
mersudin
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Re: 60km wireless link

Fri Jan 30, 2009 6:13 pm

dish would be great but u might wanna use Nstreme dual as best possible solution. U might need 4 parablic grid antena 29db but i should work as it uses nstreme dual.
p2p for that lenght u need parablic antena u might hear that grid do it's job but for me dish is far more better and i say again if u have enough foundry u should do nstreme2 it was built for long link.
 
expunge
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Re: 60km wireless link

Sun Feb 01, 2009 7:07 pm

Raj,

We have several links of this distance (actually 58-67km) and they all are reliable. As to the hardware you have selected, the 411 is a great choice, but I'd go with a 411AH. I have no experience with the R52 at these ranges but I can tell you that the Ubiquiti XR2 and XR5 are both capable of this range with no problems. One of our links is using RB333's with XR2's and 5 foot 30 db parabolics, it has been up since the day we put it up, hovering between -65 and -72. We have another link with a pair of XR5's on 411AH's with 28 db dishes and it performs almost identically.

You should be aware though, at these distances, throughput will start to fall off, we can run about 17 mbits across the single XR2 link is all. The XR5 link at 108 mbit will run about 33-35. Shorter links on our network exceed this by as much as 10 mbit so I think it's safe to say that the distance does begin to affect the link at some point. These are all single Nstreme links, the previous post about needing dual Nstreme is only if you need more bandwidth than what I just mentioned.

Tony
 
rajeshrouthu
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Re: 60km wireless link

Tue Feb 03, 2009 3:18 pm

Tony ,

Thanks for the information, Here actually i need to provide 2 mbps bandwidth only so ill go through XR5 or XR2..but what about antenna,there is no interference, can i use 2.4 ghz based antenna with 27 db grid ..?
Regards,
Raj
 
remuss
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Re: 60km wireless link

Sun Feb 15, 2009 12:26 pm

on this distance I rather use 5GHZ because, mobile phones, microwave, all home wireless is at this frequency of 2,4 Ghz. At 5Ghz at my experience if you need 2mb the link will be excellent with al most 3ms ping.

Regards

Remus
 
Tanker
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Re: 60km wireless link

Wed Feb 18, 2009 9:35 am

We have several and many of these links ranging between 50km and 90kms using 5GHz only.

Using the parabolics we have also used the R52 for (what we call) a "standard link.

Normally we use the R52H and/or XR5 with 27 dBi and 31 dBi grid antennas
- but lately all the new links have the R5H cards and these have proved really good, reliable and the throughput is brilliant.
This makes for cost effective links and we can order ALL the components (RB411's, 433AH's, R5H's etc) from one supplier.

Hope this helps.

/T
 
drewlsvern
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Re: 60km wireless link

Sat Mar 07, 2009 10:19 am

Raj,

We have several links of this distance (actually 58-67km) and they all are reliable. As to the hardware you have selected, the 411 is a great choice, but I'd go with a 411AH. I have no experience with the R52 at these ranges but I can tell you that the Ubiquiti XR2 and XR5 are both capable of this range with no problems. One of our links is using RB333's with XR2's and 5 foot 30 db parabolics, it has been up since the day we put it up, hovering between -65 and -72. We have another link with a pair of XR5's on 411AH's with 28 db dishes and it performs almost identically.

You should be aware though, at these distances, throughput will start to fall off, we can run about 17 mbits across the single XR2 link is all. The XR5 link at 108 mbit will run about 33-35. Shorter links on our network exceed this by as much as 10 mbit so I think it's safe to say that the distance does begin to affect the link at some point. These are all single Nstreme links, the previous post about needing dual Nstreme is only if you need more bandwidth than what I just mentioned.

Tony
As You obviously have experience in the area of long distance links, I'm curious on tower height on a link of these distances. What is your average antenna height? I realize that it ranges depending on elevation and numerous other technicalities...but just a ball park range would be nice. I'm looking to set up about a 75km link. Just trying to research and see what I'm gonna need.

DV
 
expunge
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Re: 60km wireless link

Sun Mar 08, 2009 9:05 am

The 2.4 GHz link I was discussing previously goes from approximately 120 feet on a tower at 4922 ft AMSL to an antenna at 60 feet on a tower at 4581 AMSL. This link is mostly clear LOS but it does have some fresnel issues and it still seems to work quite well. We will be putting up another link shortly that will go from 70 feet at 7235 AMSL to 108 feet at 5495 AMSL and that link will be 61.36 km. We'll be using 32 dB solid dishes and XR5's. I will let you know how that goes but it has perfect frenel and is pure LOS (if you can see that far).

It's really all about having good fresnel at that distance. Just do your homework and you should be fine, go with the tighetest beam dishes you can find. If you need someone to take a look at your path just post some GPS coordinates in this thread and I'll take a look and give you my 2 cents.
 
drewlsvern
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Re: 60km wireless link

Mon Mar 09, 2009 4:28 am

Yeah I'd be glad if someone could have a look see and let me know what the Fresnel looks like...I myself have been just starting with Radio Mobile, but as I've learned so far it's gonna be quite the learning curve to get used to it. Anyhow here are the GPS Coordinates:

Location 1
49 29 17.94 N 98 05 27.88 W
110 - 120 feet on the tower

Location 2
49 49 15.37 N 97 11 59.03 W
100 feet on the tower

I guess I never mentioned before either but I would be looking at setting this up as a 5ghz link.
 
expunge
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Re: 60km wireless link

Mon Mar 09, 2009 7:20 am

drewlsvern,

I think fresnel is going to be the least of your issues. If I entered the coordinates correctly there is absolutely no way that link is going to work at the heights you are talking about using. Earth curvature is your worst enemy in that area as you don't have any altitude at either location. I've attached two path profiles, the first being with 120 feet at Location 1 and 100 feet at Location 2. As you can see, you can't clear the radio horizon with your desired antenna heights. The second is at 97 meters on each end and you barely have 1 full fresnel of clearance at that height. You will likely need 400+ feet of tower at each location to have an operable link.

Image

Image
 
drewlsvern
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Re: 60km wireless link

Mon Mar 09, 2009 8:03 am

Yeah, that's pretty much the same results that I had when I did a test in Radio Mobile. So I guess I am using the program correctly, I just wasn't sure if it was all correct. I am going to have to do multiple hops to reach my location as I don't have access to 400+ feet of tower, at least not at the moment.

Thanks for Your help!
DV
 
wireless12
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Re: 60km wireless link

Mon Mar 09, 2009 2:44 pm

nice staticts
 
hgb
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Re: 60km wireless link

Sat Mar 14, 2009 7:32 pm

Guys , what are your expectaions about multi hops installation ? for example 3 hops to achive 100Km 33km each .
Does it have any type of speed degradation ? forwarding overhead or something like that "if we assumed 100% perfect connection in each hop "

thanks .

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