XPost: sci.electronics.repair, alt.home.repair   
   From: beretta@nun-ya-bizness.com   
      
   This is a multi-part message in MIME format.   
   On 10/23/19 10:49 AM, Jeff Liebermann wrote:   
   > On Wed, 23 Oct 2019 00:32:05 -0700, Johann Beretta   
   >  wrote:   
   >    
   >> You're not doing the newbies any favors.  You're starting them off   
   >> turned in the wrong direction.  It's because of clueless asshats that   
   >> the rest of us are having to move to 24 GHz where you CANNOT interfere   
   >> with our transmissions no matter how hard you try, through malice or   
   >> INCOMPETENCE.   
   >    
   > I know of several 24 GHz links that is getting trashed by cellular   
   > backhauls using the same unlicensed technology.  The problem is that   
   > getting a PtP link licensed and properly coordinated in a dense urban   
   > or mountain top environment is becoming increasingly difficult and   
   > lengthy.  Service providers want something they can install quickly   
   > and 24 GHz currently meets most of the requirements.  The interference   
   > is coming from other 24 GHz radios that are along the line of sight,   
   > or co-located on adjacent rooftops, adjacent towers, or mountain top.   
      
   So far most of the gear I have come across is rated at 2 miles or less   
   or in a single instance I'm aware of, Ubiquiti's AirFiber 24 can do   
   about 5 miles.  I'm not saying you're incorrect, just that I suspect   
   interference will be the exception and not the rule.  A cell tower   
   that's trashing someone's link is also probably having it's own link   
   trashed, or at least degraded.   
      
   >    
   > For short hops, the big move is to V-Band, 60 GHz, WiGig, or 802.11ad   
   > or maybe the new and improved 802.11ay.  What makes these work is   
   > atmospheric oxygen absorption.  At short ranges, the signal is there.   
   > However, put enough distance and air in between endpoints, and the   
   > signal drops quite rapidly.  802.11ay will allegedly work to 300-500   
   > meters range under ideal conditions (no rain, no snow, no fog, etc):   
      
   For very short hops. My Mikrotik 60G is rated at a mile. I haven't   
   deployed it yet, but from what i understand if one wants it to punch   
   through rain, then one probably should not exceed 3/4 mile and 1/2 mile   
   might be more realistic during heavy downpours.   
      
      
      
   Everything I'm hearing about 24 GHz has been positive.  I don't doubt   
   that there will be some cases of interference, but with WISP gear (I   
   don't know what the cell sites are using) having a 2-5 mile range is a   
   hell of a lot better than the nearly unlimited range of 5 GHz.   
      
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