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External Antenna

by other_universe / March 3, 2012 3:11 AM PST

Can I use only one outdoor antenna (grid) for the TL-WA901ND access point (or TL-WR1043 router), leaving the other two (omni directional antenna) for indoor use? Does this result in performance issues?
These tp-link products have three antennae that utilize MIMO technology.

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What stopped you from trying this?
by R. Proffitt Forum moderator / March 3, 2012 3:54 AM PST
In reply to: External Antenna

Of course you can try anything you want. Then you see if you like the result.

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traditional vs. MIMO
by other_universe / March 3, 2012 4:45 AM PST
In reply to: External Antenna

Thanks Bob,
What are the limitations of this arrangement? Is it better to use wireless access points that have only one antenna (without MIMO)?
I'm planning to connect two buildings 800 meters apart.

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None I can see.
by R. Proffitt Forum moderator / March 3, 2012 4:50 AM PST
In reply to: traditional vs. MIMO

You are asking if you can do this. I can't tell what your abilities are so I can't answer what stopped you.

-> But at 800 meters you should know this is going to be problematic. You could try it, fail so you convince your boss to go get the real link products for the distance.

That is, many will not accept that it rarely goes over 100 meters and at 8 times this you might be in some situation they won't believe you till you try it.

Hint? I would never try this over 100 meters. I've already been done that road.

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again MIMO
by other_universe / March 3, 2012 5:15 AM PST
In reply to: None I can see.
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And at 800 meters, will not fix the basic problems.
by R. Proffitt Forum moderator / March 3, 2012 6:36 AM PST
In reply to: again MIMO

I'm guessing here you are new to wifi networking. There are some that must learn first hand. Some take advice.

My advice is to forget this and go get a 1km link system.

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by other_universe / March 3, 2012 8:25 PM PST
In reply to: External Antenna

I need to use external grid antenna (28 dB) to be connected to the access point on each building. I've used similar arrangement to connect two buildings 600 meters apart using cheaper equipments some 6 years ago. The connection worked smoothly for more than a year.
My project is to make the similar connection but using these tp-link products. There are equipments that don't use MIMO (i.e withe single antenna). My question to the experienced personnel is that is it better to use the equipments with native single antenna or to adopt the new parts of MIMO (using only one of their antenna for external outdoor grid)?

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by bill012 / March 3, 2012 10:10 PM PST

Mimo is primarily used to increase the quality of a signal for a single source. What you are asking talking about is using the antenna for different signal sources. I would have to suspect the inside users would not work as well having one less antenna to choose from. There is little research on this since it is not a optimum configuration.

Your key problem will be the cable you use to connect the AP to the external antenna. You have the choice of using affordable cable and losing most of your antenna gain or buy very very expensive cable.

Lately it all doesn't matter. The solution is not to bother with the cables at all. You buy a outdoor AP that is designed to connect directly to the back of the antenna and run ethernet cable into the house. The price of the AP is coming down so fast even the "affordable" cable will be more expensive.

Search for Ubiquiti bullet2, last time I looked they were under $40.

Although you can continue with your design I suspect you will get a much better functioning system to use your mimo router for indoor use it was designed for and connect it to a system designed for external point to point. I suspect cost will be about the same as connecting external antenna to you internal AP when you consider the cost of the cables.

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