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  Wireless not in one room for one laptop, but is for another 
 Date Written 
Charles Kline May 04, 2012, 09:57am EDT Report Abuse
So there is a friend of mine who has a wireless router (a MIMO Linksys, not sure of the exact model) and a wireless repeater (a Belkin, again, not sure of the exact model) and they are having issues. One room of the house will prevent one laptop from getting/keeping a wireless signal, while other laptops in the room will keep the signal just fine.

The laptop that refuses to stay online is a newer Asus i5 model from around Thanksgiving/Christmas of last year. The laptop that can stick on is a Dell Latitude D520. They've replaced the wireless router, the repeater and yet nothing seems to work.

Comcast sent out a tech who said it might be because it's a MIMO router, but it wasn't working with an old Linksys non-MIMO they hooked up either, so I'll be the first to admit I'm stumped.

Any help?

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john albrich May 04, 2012, 11:57am EDT Report Abuse
>> Re: Wireless not in one room for one laptop, but is for another
Not all wireless receivers and/or antennae and/or transmitters are the same as others. Even minor manufacturing changes in the same model can make a difference in how susceptible the front-end is to interference, signal strength, frequency rejection, channel sensitivities, etc. And of course, if the transmitter in a given unit isn't "getting through" adequately due to the RF environment (which includes active and passive things) that could also affect how well a device performs. For example, you could see all the "bars" on the laptop's receiving signal strength indicator, but if your laptop's transmitter output is impacted due to either low power and/or localized conditions (e.g. steel desktop, wire-mesh in old-fashioned plaster-lattice walls, etc) then you can also have problems with a specific device (e.g. that particular laptop) not working while others right next to it work fine.

It may be as simple as trying different channels (if you've not yet tried that).

Antenna can also make a huge difference. I've got some internal strip antennae that work great in the same location at a 45 degree orientation, but the signal is lost 100% when the unit is oriented at an even slightly different angle.

Search [ wifi interference ] in HWA search bar (top right corner) and you may find something helpful.

Also, here's a specific link that talks about various factors that can affect some devices more than others.

edit: clarify that "RF environment" includes active and passive things that can affect RF operation

Dr. Peaceful May 05, 2012, 10:35am EDT Report Abuse
>> Re: Wireless not in one room for one laptop, but is for another
Charles Kline said:
Comcast sent out a tech who said it might be because it's a MIMO router, but it wasn't working with an old Linksys non-MIMO they hooked up either...

Absolutely, non-sense! Not to mention I think MIMO is a very confusing term for describing routers. Multiple antennae router is a more appropriate term.

From your description that one computer would prevent a second computer from getting on the network, one possibility is that something is wrong with the network settings of the first computer.

It is known that computer with Comcast Desktop software installed could take the whole network for its own, and preventing other computers from getting on the network. Usually a tech would install the software onto a computer, which is directly connected to the cable modem, therefore by-passing any router. Because of that, the software would give the computer the same IP as the router, causing an IP conflict in the network.

So the first thing to make sure is if your friend's Dell has Comcast Desktop installed. If yes, uninstall it completely, run the commands below in the command prompt to clear the network settings, and restart computer. If not, then you need to investigate further into the network settings of that computer and make sure it's not conflicting with the network, you can run the same commands below if necessary.

Commands for clearing network settings:
ipconfig /release
ipconfig /flushdns
netsh interface ipv4 reset

If this does not solve the problem, then you need to investigate further into the settings of the routers / repeaters. And certainly John's suggestion on channels and interference could be a possibility. Post back and let us know how it goes, thanks!



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