XPost: comp.mobile.android, alt.os.linux, alt.comp.os.windows-10   
   From: dan@djph.net   
      
   Tomos Davies wrote:   
   > In , Dan Purgert suggested:   
   >   
   >> 20-23 dBm conducted power seems to be pretty standard across the   
   >> "better" kit since about 2014 or so (though, admittedly, I've stopped   
   >> keeping up since discovering UBNT kit).   
   >   
   > Thanks for the clarification.   
   >   
   > Even if a SOHO router did have a powerful transmitter, most of them have   
   > omni antennas which dissipate the energy in all directions.   
      
   That doesn't make it any less energetic ... just means you're "losing"   
   gain at teh antenna for coverage pattern.   
      
   > [...]   
      
   >> Well, provided you don't tick the "I know what I'm doing" box where you   
   >> can set the conducted power yourself ... though that may have been taken   
   >> out on the 'US' kit.  They accidentally shipped me a 'world' model once   
   >> (test 5ac unit, once I realized it wasn't a US unit, it got stuck in the   
   >> corner... while I can set it to 'US', would rather not goof and have the   
   >> FCC come knocking ;) ).   
   >   
   > While the Ubiquiti radios only allow a few country settings, this Mikrotik   
   > RB411 R52n-M transceiver I'm working on at this very moment seems to   
   > have a couple hundred countries to choose from!   
      
   If that's the case, it is illegal to operate in the United States.  FCC   
   rules for intentional radiators (i.e. radios) using the ISM bands state   
   that it must not be possible for an installer / end user to select a   
   frequency outside US-allowed ones.   
      
   That's why UBNT sells a "US" version (allowed countries - US, Canada,   
   Puerto Rico) and a "World" version (literally everywhere else)   
      
   > [...]   
   >   
   >> Most modern SOHO kit is 5-6 dBi.  That being said, omni vs. directional   
   >> doesn't really matter in the scope of our "on paper" maths. Obviously,   
   >> the real world will throw a monkey wrench into the works.   
   >   
   > In general, omni works for routers because they're generally put in the   
   > middle of the house (or thereabouts) but in general, if you want to go a   
   > few hundred feet to the barn, a directional antenna has more bang for the   
   > buck (IMHO).   
      
   As you mention, it depends wholly on placement, and coverage needs.  Put   
   an omni in the "middle" of your barn, and it'll perform exactly the   
   same.   
      
   > [...]   
   >> Point being though, it's very easy to make this kit sound like it does   
   >> something wildly different than what it's been designed to do.   
   >   
   > What this professional stuff is designed to do is carry WiFi signals for   
   > miles, but what I'm using the transceivers for is to only beam my signal   
   > less than a kilometer from the SOHO router that they're connected to.   
      
   No, it is not "designed to carry *WiFi* for miles."  "WiFi" was a   
   secondary (and now removed) "feature" of the product, due to the   
   chipsets that it was using.   
      
   >> You may want to check your local fire codes concerning that -- it's   
   >> against them here (Eastern US), due to the differences in   
   >> ground-potential, and that in the event of a short, the mains voltage   
   >> may decide the best path to ground is via the ethernet cabling.   
   >   
   > That's a good point but we do lay cable on the ground all the time out   
   > here. Your point is well taken though, and is sensible.   
      
   "We've always done it this way" is one of those phrases that a fire   
   marshall will not take kindly to.   
      
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