XPost: microsoft.public.windowsxp.general, sci.electronics.repair   
   From: beretta@nun-ya-bizness.com   
      
   This is a multi-part message in MIME format.   
   On 10/14/20 7:21 PM, Jeff Liebermann wrote:   
   > On Wed, 14 Oct 2020 00:25:08 -0700, Johann Beretta   
   >  wrote:   
   >    
   >> On 10/6/20 4:35 PM, Jeff Liebermann wrote:   
   >>   
   >>> To get some decent speeds, 5GHz   
   >>> instead of 2.4GHz.   
   >    
   >> Generally speaking, yes.  Practically speaking you can do several   
   >> hundred mbps over a 2.4 link. You just need to widen the channel.   
   >    
   > While there are 2.4GHz routers available that have a 40MHz channel   
   > bandwidth setting, I prefer not to use it because it reduces the   
   > available bandwidth to other users on 2.4GHz.  If one is sufficiently   
   > clueless to use a 40 MHz channel set to CH6, it will effectively   
   > trash most of the 2.4GHz band.  Since Wi-Fi pollution can be   
   > symmetrical, it also makes the receiver susceptible to more   
   > interference.  Stay with 20MHz channel bandwidth on 2.4GHz.   
      
   In dense environments, I agree.  In rural areas, interference may not be   
   a factor.  In extremely rural areas, interference PROBABLY won't be a   
   factor.   
      
      
   >    
   > On the other foot, the minimum channel bandwidth on 5GHz is 40MHz   
   > (depending on channel selected) with an option to use 80MHz or 160MHz   
   > for 802.11AC and AX (Wi-Fi 6).     
   >    
   > With 1024-QAM, 802.11AX can theoretically do 1.2Gbits/sec in a 160MHz   
   > channel.  Your mileage will certainly be less.     
   >    
      
   No.. The minimum 5GHz channel bandwidth is 5MHz. Not sure where you are   
   coming up with 40MHz as a minimum. Out of several dozen transmitters, I   
   only have two set to 40MHz (backhauls). The rest are set to 20MHz with a   
   couple at 10Mhz.   
      
   My gear (Ubiquiti) supports 5, 8, 10, 20, 30, 40, 50, 80 Mhz wide channels.   
      
   >    
   > Anyway, the performance limiting factor is usually interference from   
   > co-channel users and noise sources.  You could have all the bandwidth   
   > in the world, the most efficient modulation scheme, maximum legal RF   
   > power, and still not be able to communicate very well or far if there   
   > is an interference source nearby.  In other words, one needs to do   
   > more than just "widen the channel".   
   >    
      
   Once again, sometimes. Sometimes ALL you need to do is widen the channel.   
      
      
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