Running on 40MHz or 20MHz?

[leolaikz]

How do I know whether my laptops wifi card able to run on 802.11n with 40MHz? I have a D-link DSL-2750U, two Toshiba M840 with Atheros AR9485WB-EG and a HP Mini S110 with AW-NB041H. I would like to transfer large files but the speed is way too slow even with the wifi set to 40MHz. Please help. Thanks in advance.

Leo

 

[RealBeast]

I think that all of those adapters will work with 40MHz channels, but if you have a lot of 2.4GHz wireless around you, it won't work well, as it requires so much of the available N bandwidth. Download inSSIDer and run it on a laptop around your place to look at the other 2.4GHz networks by channel and signal strength.

 

[leolaikz]

I think that all of those adapters will work with 40MHz channels, but if you have a lot of 2.4GHz wireless around you, it won't work well, as it requires so much of the available N bandwidth. Download inSSIDer and run it on a laptop around your place to look at the other 2.4GHz networks by channel and signal strength.

But actually I don't really know how to interpret the software. Crossing over each = interfering? Should I take the readings nearby the router, or at the spot where I use my laptop? Thanks for helping.

 

[RealBeast]

Interference is due to other networks on the same channel with high signal strength. Just look at the display of signal strength by channel and see if your channel is the only one there.

 

[leolaikz]

Interference is due to other networks on the same channel with high signal strength. Just look at the display of signal strength by channel and see if your channel is the only one there.

I think the speed of the wifi degraded due to interference. I changed the channel to a less crowded one and all of my devices able to obtain 150Mbps. and from inSSIDer, i notice that only if I use 40MHz (Channel bonding), then I could achieve max rate of 300Mbps. But even with 40MHz set, the interference of neighbours' wifi make it impossible to get 300Mbps. Thanks for your advice.

 

[leolaikz]

Best answer selected by leolaikz.