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Standard User greenglide
(committed) Tue 13-Nov-12 15:50:18
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Re: Which Wifi Channel

[re: oldskool] [link to this post]
I really think you need a 5GHz router - even if it is installed on the first floor and run off the present router via wired (preferably) or wireless bridge if the new AP supports true dual band?

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Standard User eckiedoo
(regular) Tue 13-Nov-12 16:05:42
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Re: Which Wifi Channel

[re: oldskool] [link to this post]
Afternoon oldskool

Re the location of your router, if it is on the ground floor, have you tried moving it to the middle floor, ie central within your house dimensions?

where-abouts did you use the inSSiIDer device, immediately adjacent to your WAP; or at some distance from it?

I suggest that generally, the situation is going to get worse, as more and more devices take advantage of WiFi, as a "convenient" means of communicating.

With the quantity of WiFi circuits around you, and discounting the various "free" ones, it looks as though you would have great difficulty organising co-operative allocation with several neighbours, so I suggest that the solution has to be found directly in your own domain, apart from whether your neighbours having the knowledge to actually access their devices.

The devices you have noted changing channels are probably doing this automatically, to reduce/avoid the contention you are observing.

It may be that you have to improve on any screening achieved with your outer walls etc, may have to be supplemented by painting them with a suitable screening paint.

If as you state, the internal walls are thermalite, I suspect that you may have to have separate WAPs on each floor.

Then it may be that you have to replace your router with a more up-to-date one, to get similar automatic switching facilities.

I have noted with my recently supplied Bright Box, that it switches from the double-channel mode to a single channel, simultaneously changing from 300 MHz to 54 MHz; and also moving to a distinctly different channel.

Then back again.

And that is with only one or two relatively weak WiFi signals observed using inSSIDer.
Standard User micksharpe
(eat-sleep-adslguide) Tue 13-Nov-12 16:24:57
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Re: Which Wifi Channel

[re: oldskool] [link to this post]
You could install access points on each floor and/or use homeplugs. Whichever way you go with 2.4GHz, you're still going to have channel contention with nearby dual-channel high-speed routers. If I was living in a busy neighbourhood, I'd move to 5GHz like Andrew said and enjoy some peace and quiet (for a while).

Edit: I've just looked at your inSSIDer output. Move to 5GHz (or wired).

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Edited by micksharpe (Tue 13-Nov-12 16:42:17)

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Standard User MHC
(sensei) Tue 13-Nov-12 17:28:35
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Re: Which Wifi Channel

[re: Jimneybob] [link to this post]
Almost but not quite ...

The channels are 5MHz apart and 20MHz wide, although on 802.11b they were 22MHz

Take Ch1 centred on 2412 MHz it will spread from 2402 to 2422 and Ch5 is centred on 2432MHz which will spread from 2422 up to 2442 There is NO overlap with that pair - similarly 5 & 9 and 9 &13

The use of 1, 6 & 11 originates in the US where 12 and 13 are not permitted.

I do have quite a few years experience in communications and have a fairly good understanding. Having undertaken some major testing with a manufacturer of networking and wireless equipment and one of my customers in a specific controlled environment we were able to demonstrate full throughput using 1, 5, 9 & 13 and almost near full throughput using 1, 4, 7, 10 &13 and it was only when almost co-located did we see problems.

Get inSSIDer running and look at the channels and notice the lack of overlap.



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Standard User prlzx
(experienced) Tue 13-Nov-12 21:51:52
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Re: Which Wifi Channel

[re: MHC] [link to this post]
Just to endorse MHC and add that if the neighbours insist on leaving their wi-fi in 40MHz mode (sometimes shown as 40/20 auto)
(that's what scans like 2+6 mean), to emphasise this also points towards 1,5,9,13.

The 40MHz-ers may need to choose 1 or 13 (to be certain their router should combine that with 5 or 9 respectively).
If a router auto scans and chooses 40MHz on any other combinations that is not very helpful.

Routers with country settings need to be on UK (or at least Europe) rather than USA (on older laptops Wi-Fi drivers sometimes default to USA incorrectly also).

It is almost always better to be on the same channel as someone than +/- 1,2,3 away (as devices on the same channel can listen for when the next "gap" is due, to retry, whereas adjoining channels just represent interference (and raises the noise floor).

Finally (and that on most routers especially is never done) if someone only needs their router to cover one room, turn down the power if possible (lowers the noise floor nearby).

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Standard User oldskool
(member) Fri 16-Nov-12 16:35:50
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Re: Which Wifi Channel

[re: prlzx] [link to this post]
Just wanted to update this thread after all this great advice.

I've tested quite a bit, everything from signal strength to throughput speed.

One poster here mentioned that it is better to be on the same channel than 1 that overlaps. This translates perfectly in my situation.

Channel 1 initially looks quite decent because the signal strength is quite weak in most cases, however it is also peppered with people using 40mhz cross channel configurations.

6 was equally attractive because it was the least used channel, i tried 5 and 7 too and both suffered from poor throughput and stability because of people spanning several channels in 40mhz mode.

Overall, i've settled on channel 13. It has given by far the best signal strength, with both antennas pointing up i get an excellent signal on the top floor, near full throughput speed and none of the stability issues i had with the other channels.

I can't say it's 100% perfect, i am still sharing with 1 or 2 other users but there is no or a lot less cross over.

On the other channels on my iphone it would take forever to load web pages, i assume to due congestion. 3G was much faster, now on channel 13 they load almost instantly, rarely with hiccups now.

When i upgrade my router i will definitely look at getting a couple of 5ghz models and some home plugs. I only just bought my billion router so i will keep this for a while

thanks all
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