The issue is that as channel width has grown from 20 MHz now up to 160 MHz, WiFi radio power has stayed the same. Every time you double the channel width, there is a 3 db penalty. So that means a 160 MHz channel will have 6 db less signal strength than a 40 MHz channel. How it works in DD-WRT: To configure your radio channels in the WebGUI you browse to the "Basic Settings" under the "Wireless" page on your DD-WRT router. If you have dual band router (ie. Two Radios inside the router) you will see two sections for configurations listed in this page with the headings as "wl0" for the 2.4GHz radio and "wl1" for 40MHz and 80MHz Control Channels. 04-22-2022 11:08 PM. I'm confused by how Meraki specifies the control channel frequency for 40 and 80MHz channels. The web UI and the API only allow selection of 20MHz-width 5GHz channels, and then the wider channel that overlaps that 20MHz channel is used if the operating width is greater than 20MHz. Part of the Furniture. Jan 31, 2014. #3. 20/40/80 is the width of the channel you choose, in MHz. Use 20MHz as a rule. If you have a user device that supports 40MHz (few do) and NEEDS that extra high speed potential-only, choose 40, in the 5GHz band. Wider channel, if user device compatible, brings the disadvantage of needed stronger signals. wrote: So in your opinion it will be better or best practice to use 40MHz channels with 5GHz only correct? I would prioritize 40 Mhz channel width, HOWEVER, this will depend on the worst wireless client. If there is a wireless client that won't talk in 40 Mhz then crank down to 20 Mhz. wrote It's usually a good alternative for PtP networks and offer a balanced option between narrow and wide channels. It is important to note that 30MHz channels only support 11ac MCS8 (2 spatial streams) rates. On the other hand 40MHz and 50MHz channels support up to 11ac MCS9 (2 spatial streams) data rates. As such on the 5GHz channel you can use the 40MHz, 80MHz or even the 160MHz channel bandwidths (if your router or AP supports it) for increased bandwidth. Note: Difference between range and bandwith. Range: how far your data can travel. In most cases, the higher the frequency of a wireless signal, the shorter its range. JwzkE8.

difference between 20mhz and 40mhz wifi