Re: problems setting the channel

[Larry Finger <Larry.Finger@lwfinger.net>]

On 09/13/2013 12:11 PM, Albert Lo wrote:
>
> Hello,
>
> Forgive the newbie question, but I'm having a hard time setting the channel.  Here is my output:
>
> ======================================
> root@OpenWrt:~# iw dev wlan0 info
> Interface wlan0
>      ifindex 7
>      wdev 0x2
>      addr 04:f0:21:01:1b:91
>      type AP
>      wiphy 0
>      channel 11 (2462 MHz) NO HT
> root@OpenWrt:~# iw reg get
> country US:
>      (2402 - 2472 @ 40), (3, 27)
>      (5170 - 5250 @ 40), (3, 17)
>      (5250 - 5330 @ 40), (3, 20), DFS
>      (5490 - 5600 @ 40), (3, 20), DFS
>      (5650 - 5710 @ 40), (3, 20), DFS
>      (5735 - 5835 @ 40), (3, 30)
> root@OpenWrt:/# iw dev wlan0 set channel 10
> root@OpenWrt:/# iw dev wlan0 set channel 19
> command failed: Invalid argument (-22)

--snip--

> Any ideas as to how I can set wlan0 to the channels in  Band2?

There is no channel 19 in wifi! That is the reason you cannot select it.

To select Band 2, you would need a dual-band Access Point. Do you have one?

Clearly, you have little knowledge of wifi. I suggest you read 
http://en.wikipedia.org/wiki/List_of_WLAN_channels.

Larry