Channel 40 cannot set under 11ac 80MHz

Installing and Using OpenWrt Network and Wireless Configuration
1

Dear All,

im trying to set a qca9880 radio to channel 40 with 80Mhz bandwitdh, but after save&apply, i saw its working in channel 36.

btw: is it posible that disable all dfs channel?

Regards,

2

An 80 MHz signal covers all 4 channels of the lower block anyway.

If you set a fixed channel outside of the DFS range, it will stay on that channel and not change frequency.

3

Dear mk24,

idont know why just 40 cannot set.. ive testted all others channel, seems all right..

i mean is it posible to disable dfs channel in driver and luci, so that user cannot set them at all.. some fcc problem

Thanks.

4

This thread might be very helpful: Linksys WRT3200ACM only transmits with 20 MHz on the AC radio

It addresses:

  • Why you see 36 when set to 80 MHz
  • Information regarding DFS and regulatory settings

Incorrect, many countries require DFS, not just the US-FCC. Changing some radio configurations (e.g. DFS) can cause your device to transmit with a configuration that is illegal, causes interference, etc.

If you're allowed to use WiFi without DFS in your nation, that will be configured by changing the country setting.

6

Dear lleachii

I'm curious about why other channel can set ( 44, 48,52,56 ....) but only 40 go back to 36

i saw the hostapd.conf generate by mac80211.sh, there`s nothing different. is that shoud be and ath10k bug?

Regards,

7

Channel 36 pairs with channel 40 to allow 80 Mhz with 802.11ac

Called channel bonding.