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Old 10-05-2006, 07:10 PM
Gary \The Bear\
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Default 3 mile wifi hookup

I have 2 DI524 routers and I'm wondering if I buy 2 HD18035 antennas if they
will linkup. I can place 1 antenna on top of a 2 story building and 1
antenna on top of my house. I think the tops of a few trees might be in the
line of site. Ground level (where my dsl modem is} will be slightly higher
than at home. I really can't quite figure out where to start to see if this
project is economically feasible for me. Maybe I need to buy new routers to
take advantage of the antennas. I can't seem to find any simple answers.

Bear

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  #2 (permalink)  
Old 10-05-2006, 11:18 PM
Jeff Liebermann
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Default Re: 3 mile wifi hookup

On Thu, 5 Oct 2006 14:10:21 -0500, "Gary \"The Bear\""
<gary65@netins.net> wrote:

>I have 2 DI524 routers and I'm wondering if I buy 2 HD18035 antennas if they
>will linkup. I can place 1 antenna on top of a 2 story building and 1
>antenna on top of my house. I think the tops of a few trees might be in the
>line of site. Ground level (where my dsl modem is} will be slightly higher
>than at home. I really can't quite figure out where to start to see if this
>project is economically feasible for me. Maybe I need to buy new routers to
>take advantage of the antennas. I can't seem to find any simple answers.



If it were easy, it would be no fun.

1. Wireless routers do not normally talk to each other unless they
support WDS. The DI-524 does not support WDS and will not work.

2. The HD18035 antenna is a 24dBi dish. That will probably work
fine.

3. Do the path calculations. See:
http://wireless.wikia.com/wiki/Wi-Fi#Link_Calculations
Bug me if you need help. Make a decision if the wireless devices will
be near the antenna or at the lossy end of a long coax cable run. How
long?

4. Ever hear about things like feet or meters? How high is the
house? How high is the other end? How high are the antennas? The
problem is that at 3 miles, 80% of the fresnel zone clearance at
midpoint is about 32 ft. Your antennas will need to be at least 32
feet off the ground or the fresnel zone will hit the ground. I you
have buildings, trees, hills, and other obstructions in the way,
probably higher:
http://www.terabeam.com/support/calc...esnel-zone.php
It's more than just the top of the trees that may be in the way.


--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

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  #3 (permalink)  
Old 10-06-2006, 03:41 AM
Maxim Chartrand
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Default Re: 3 mile wifi hookup

Gary "The Bear" [ 2006/10/05 15:10 ] :
> I have 2 DI524 routers and I'm wondering if I buy 2 HD18035 antennas if they
> will linkup. I can place 1 antenna on top of a 2 story building and 1
> antenna on top of my house. I think the tops of a few trees might be in the
> line of site. Ground level (where my dsl modem is} will be slightly higher
> than at home. I really can't quite figure out where to start to see if this
> project is economically feasible for me. Maybe I need to buy new routers to
> take advantage of the antennas. I can't seem to find any simple answers.
>
> Bear
>


Hi Gary,

I'm new on this wire.

I agree all points raised by Jeff. You have to answer some basic
technical questions to see if it's a realistic project.

May I suggest you a couple of things :

The DWL-2100AP multi-mode radio would be a good equipment for you
application. It's cheap and supports several modes including WDS. If you
go with this unit, make sure to update the devide with the most recent
firmware.

Use a DI-524 on the high speed connection side and a DWL-2100AP at the
remote site (configured in client mode). If you want to plug more than
one PC at the remote site, use your second DI-524 and plug the
DWL-2100AP in the WAN port of the router. To avoid any conflict, make
sure to use a different IP range for your remote site.

A good 24dBi grid is a DC24 made by Pacific Wireless. Depending the
distance (free space loss), an optional antenna would be a PA24-19, this
one has 19dBi of gain.



Maxim



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  #4 (permalink)  
Old 10-06-2006, 06:06 AM
Jeff Liebermann
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Default Re: 3 mile wifi hookup

Maxim Chartrand <maxim.chartrand@gmail.com> hath wroth:

>The DWL-2100AP multi-mode radio would be a good equipment for you
>application. It's cheap and supports several modes including WDS.


Just a note on WDS. WDS is handy, useful, and sometimes actually
works. However, it's incompatible with WPA encryption due to the use
of dynamic encryption keys. It's one or the other, not both. If
you're going to use WDS, be prepared to run inferior WEP security.

>Use a DI-524 on the high speed connection side and a DWL-2100AP at the
>remote site (configured in client mode).


In client mode, WPA encryption will work just fine.

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Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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  #5 (permalink)  
Old 10-07-2006, 03:58 PM
Bill Kearney
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Default Re: 3 mile wifi hookup

> 1. Wireless routers do not normally talk to each other unless they
> support WDS. The DI-524 does not support WDS and will not work.


Yes, and even when routers DO support WDS many often have to be configured
to even speak with each other.

Given the other hassles with WDS (no WPA and reduced bandwidth) I'd never
want to bother using it.


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