XPost: comp.mobile.android, misc.phone.mobile.iphone   
   From: rod.speed.aaa@gmail.com   
      
   "Roy Tremblay"  wrote in message   
   news:ooaqf6$c4r$1@gioia.aioe.org...   
   > Rod Speed  actually wrote:   
   >   
   >> A weatherproof AP on the back wall of my house would be fine   
   >> with nothing at the neighbours place at all, just their devices.   
   >   
   > OK. You just constrained the solution by a lot.   
   >   
   > My assessment is below, but anything that Jeff says trumps what I say.   
   >   
   > With that caveat, no matter which device you put on your wall, you will   
   > have no problem whatsoever painting the neighbor's house from your house.   
   >   
   > Once you paint their house from your newly installed outside-wall access   
   > point, their hand-held devices will see your 2.4GHz access point that you   
   > put on your back wall, without any problem. At their house, the signal   
   > strength you paint them with will be huge, for example, something like   
   > -35dBm or something huge like that.   
   >   
   > They will have no problem "seeing" your access point.   
      
   > The problem will be that you need a good antenna on your side   
   > to pick up their weak iDevice signal and you'll need a radio with   
   > good sensitivity to pick out that weak signal from the noise level.   
      
   That should be ok, they don’t currently have any problem with the   
   puny little Medion P85019 (MD 86977) wifi repeater halfway down   
   the backyard which doesn’t have any external antenna at all.   
      
   > So you're gonna want to find the least noisy channel, but at 2.4GHz,   
   > you'll   
   > be limited (as I'm sure you're aware). Let's hope it's not noisy where you   
   > are.   
      
   Nar, its pretty decent, very little is visible on apple devices, still   
   only a total of maybe 6 visible on the most sensitive androids.   
      
   Nothing in the way of crude remotes that I know of.   
      
   > Jeff knows that stuff far better than I do, where in my loose experience,   
   > the sensitivity of any Ubiquiti receiver is pretty good, like in the 85   
   > dBm   
   > to 95 dBm range (yes, I know that's a 100 fold range).   
   >   
   > In your case, with just one access point on your house wall, since it   
   > greatly matters, you'll want to make your decision based on two things.   
   > 1. You want a really good antenna to receive their puny signal, and,   
   > 2. You want good sensitivity in your radio (to pick it out of the noise).   
   >   
   > Given that, I'd recommend at least the nanobeam/powerbeams that Jeff had   
   > recommended. You could even do with the Rocket M2 that I have but that   
   > might be overkill since the dish is about 18 inches wide as I recall.   
   >   
   > To summarize, here's what you do.   
   > 1. You buy a radio with a good directional antenna & receiver sensitivity.   
   > 2. You plug the POE into the wall outlet near your router.   
   > 3. You hook a short Ethernet cable from your router to the POE.   
   > 4. You hook a long Ethernet cable from the POE to the outside wall.   
   > 5. You mount the radio outside at least 12 feet high (if you can).   
   > 6. We can show you later how to set up that radio as an access point.   
   >   
   > That's it for what you do.   
   >   
   > As I said, you'll be painting them with -35dBm so they'll see your AP   
   > without any problems. The problems are that their devices don't have a lot   
   > of power to get back to your radio, so your signal strength will be   
   > asymmetric. It will be great going to them, and lousy coming back.   
   >   
   > Obviously if you want it to be great coming back, you put a paired radio   
   > on   
   > the neighbor's wall - but if you don't do that - it "probably" will still   
   > work if you get a good radio with a good antenna and receiver sensitivity.   
   >   
   > Looking up the specs on my nanobridge M2 "NBE-M2-400 US"   
   > https://dl.ubnt.com/datasheets/nanobeam/NanoBeam_DS.pdf   
   >   
   > The Antenna gain is 13dBi to 18dBi (note that my Rocket M5 antenna is   
   > 30dBi) where every 3 dBi is a doubling of power (and a narrowing of the   
   > beam).   
   >   
   > In your case, you don't care how narrow the beam is, so you can go from   
   > the   
   > 18dBi antennas to a 30dBi antennas. You can even hook a cheap Ubiquiti   
   > Bullet M2 to a planar 20dBi antenna if you like. But most people like the   
   > integral radio/antenna units like the nanobeam M2.   
   >   
   > Remember that the puny iDevices in your neighbor's house have to go the   
   > same 150 feet to your back wall. You have to receive that puny signal over   
   > the noise, and then amplify the heck out of it.   
   >   
   > So you want antenna gain (from 18dBi to 30 dBi would be good).   
   > And you want good receiver sensitivity (dunno - maybe 90dBm to 95dBm).   
   >   
   > Here's my summary which Jeff can trump at any time.   
   > a. If you put matching radios on both houses, it WILL work.   
   > b. If you put only one radio on your house, it "probably" will work.   
   >   
   > Go for the most gain in the antenna and the best sensitivity in the radio.   
   > (Remember every 3dBi is a doubling of power received.)   
   >   
   >   
   >   
   >   
      
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