Discussion in 'Tomato Firmware' started by ratchet, Mar 24, 2009.
If so why and what is the scan about? Thank You!
The "best" wireless channel varies. Just do a scan and use the channel that is the least used.
Remember that each router uses a spread of 5 channels - you therefore normally have a choice of only 3 channels within the g band. Google for more info ...
This is why.
Yes there are 3 channels that dont overlap but overlap is not the demon that many make it out to be. As stated find a channel that is not used and go from there. You are going to find you get much more interference from things in and around your home than you do from other wireless devices your antenna picks up.
I just wanna add that some channels, such as channel 6 is used by alot of routers but sometimes gives off little interference, and a single channel being used by a single person doing wireless p2p 24/7 will generate quite a bit of interference. Newer routers will auto select the best channel for use, or have the option to do so.
I've noticed that everyday, during lunch hours, my wireless net slows down to a crawl, probably from microwave ovens & cordless phones from businesses and neighbors. That's where dual-band routers REALLY shines!
In essence the "best" channel is one your neighbors aren't using - a clear, empty channel.
Beyond that, I tested all channels and noted higher number channels gave progressively higher dBm readings. Without test equipment, I can't attribute the change to the laptop WLAN receiver or router transmit passband. However, RF devices are aligned (tuned) for the middle of the spectrum they were designed to cover. Therefore, I would expect a channel 7 (or higher) reading to be higher than a channel 1 reading.
I'm hoping that Jon implements an auto channel selection feature into Tomato...
Well, 'my' best wireless channel is 9 because it gives the highest signal for my PS3 whereas channel 6 10 and 11 are used by others around my neighbourhood and gives the weakest signal.
Some of us aren't so lucky. I have some neighbors who crowd channels 6 and 11, and others who jump in on channel 1, so there's not any single channel that works well for me at all times.
I guess 5Ghz is the next best bet.
I've tried 3 different 5-GHz routers, and they all suck enough that I've had to RMA them. I give up.
I have set up several wireless networks for myself, friends, family etc. In all the cases I can think of I'm using one of the "oddball" channels, not 1, 6 or 11 because in every location those channels all are used by at least one and usually several AP's. I've had good results with this and I see no reason at all why it wouldn't be superior to trying to run on the same channel as someone else's WLAN. While the channels do overlap the noise must still be lower and there's probably less of a chance of someone new coming along and being on the same channel if you use something like 2, 3, 8 etc.
Also, when I do a site survey I use my Engenius USB adapter on my laptop because it's VERY sensitive. This must be important because even if your router and adapter can't pick up another wireless network signal as what it is, it's still seen as noise. At my folks' place which is out in the country I was surprised to see about 6 WLANs in the area using my Engenius box where I didn't see more than one or two other ones using the WRT54G or similar products. I have one long wireless link there and suddenly it went from reliable to not so hot overnight due to interference on the channel I was using, 6. I think I'm using channels 2 and 8 at that location, works fine now.
I have found that sometimes there is nothing to be seen on the various checking devices but some channels still do not work very well.
Trial & error by just trying each channel can sometimes give supprising results.
As mentioned previously, microwave cookers & phones etc can stop a channel working as well as you would expect.