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    Is It Worth Trying a 915 MHz Wireless Link; Such As, Ubiquiti XR9, or SR9?

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      Elludium_Q-36 last edited by

      Is it worth the effort, in a small city, to try and use a 915 MHz wireless link, as an interface, in a pfSense deployment?


      I'm only interested in UNlicensed spectrum, ITU Region 2, U.S.A. (FCC), that allow encrypted data:
      http://en.wikipedia.org/wiki/International_Telecommunication_Union_region

      I'm not aware of any DECT networking equipment in the Unlicensed PCS band of 1910 to 1930 MHz.
      http://en.wikipedia.org/wiki/Digital_Enhanced_Cordless_Telecommunications#DECT_for_data_networks

      On the FRS band, what I would want to do, would be considered as a TNC (Terminal Node controller), which is a "No-No"!:
      http://home.provide.net/~prsg/frs-faq.htm#Q15

      Considering my range of .5 miles, to one mile; that seems to narrow it down to one ISM band, 915 MHz:
      http://en.wikipedia.org/wiki/ISM_band

      I'm thinking about a Ubiquiti XR9 or SR9.


      I only came up with a couple threads on here:
      https://forum.pfsense.org/index.php?topic=943.0
      https://forum.pfsense.org/index.php?topic=7873.0


      It looks like there's a theoretical 54Mbi/s, but I'd be happy with a consistent 5!  I'm certainly NOT getting that, over 3G.


      I see a list of some of the other hardware I've investigated:
      http://en.wikipedia.org/wiki/33-centimeter_band#900.C2.A0MHz_wireless_networking


      There are transverters, to put in-line, between a 2.4 GHz 802.11b/g/n router, and the antenna, but they are quite pricey, and you need to tweak settings, such as channel width.


      I assumed a 700 mW output from the cards, and came up with an estimated "Approximate Received Power Level" of -66 dBm, using this online tool:
      http://n9zia.ampr.org/urban.main.cgi

      The endpoint feeding data would probably be an omni antenna, and there are some trees, woodframes, stone/concrete, rebar/metal stud walls, with which to contend.

      The end feeding the data could be a "routerboard"…


      I'm willing to bet SOME on here have the real world experience.


      There is actually an IEEE draft for 900 MHz (902 - 928)/ 915 MHz band networking: 802.11ah 
      http://en.wikipedia.org/wiki/IEEE_802.11ah


      802.22 / 802.11af "White Space"/"Super WiFi"/"WhiteFi"/etc. might be better yet, but it is too new to be affordable:
      http://en.wikipedia.org/wiki/802.22
      http://en.wikipedia.org/wiki/IEEE_802.11af


      Thanks!

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