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Re: [WestMichiganHams] WiFi Polarization

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  • k8mhz@k8mhz.com
    Al, I found some plans for the SBA. The predicted gain is 14dBi. It does not look very hard to construct. The material is copper and may be pricey but there
    Message 1 of 8 , Sep 5, 2006
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      Al,
       
      I found some plans for the SBA.  The predicted gain is 14dBi.
       
      It does not look very hard to construct.  The material is copper and may be pricey but there is a metal shop here in town that stocks it and will sell cuts.
       
      Mark K8MHZ
       
      ----- Original Message -----
      From: k8mhz@...
      Sent: Tuesday, September 05, 2006 14:56
      Subject: Re: [WestMichiganHams] WiFi Polarization

      Yes,
       
      Plans and info for the SBA would be interesting.
       
      I don't really know what the range of the Cantenna is.  15 miles is very doubtful.
       
      With the new MiMAX coming to other townships first I would like to try a little DXing then.
       
      ----- Original Message -----
      Sent: Tuesday, September 05, 2006 04:11
      Subject: Re: [WestMichiganHams] WiFi Polarization

      The cantenna is what I had in mind....with a little variation.  Back in the 60's  a physicist working with the USAF developed a unique antenna called the SBA, or short backfire antenna.  It works on the same principle as the cantenna, but picture a cookie tin used as the waveguide as opposed to a coffee can.  It has a larger diameter and less depth than a coffee can.  From what  I've read so far, the SBA is a big hit with the WiFi group in Europe.   I'll pass along a couple of links from the IEEE group with photos and such if you are interested. 
              What distances have you covered with the cantenna design so far??    My radio range is roughly 15 miles at 2.4 gHz,  and I have multi mode RX capability on that band .  Just need to build an antenna, hoist it up 80 feet and see what we can hear.    This could prove  very interesting !!!                                                                              
                                                          KV8X
       
      -------Original Message----- --
       
      Date: 09/04/06 21:23:37
      Subject: Re: [WestMichiganHams] WiFi Polarization
       
      May I suggest a Cantenna?  Mine works well as a waveguided directional.
       
      Parts are 1 coffee can, 1 chassis mount PL259 connector, a piece of #12 solid wire 1.21 inches long, four screws, a 1/4x20 nut and some electrical tape.  Fits nicely on my camera tripod.
       
      ----- Original Message -----
      Sent: Monday, September 04, 2006 20:12
      Subject: Re: [WestMichiganHams] WiFi Polarization

      Vertical it is by popular consensus... . Now to build the antenna..... ..KV8X 
       
      -------Original Message----- --
       
      Date: 09/04/06 14:43:20
      Subject: Re: [WestMichiganHams] WiFi Polarization
       
      Every access point/router/ unit with an external antenna I have ever seen
      has used vertical polarization, though it seems that the PCMCIA cards
      must be using horizontal antennae. Vertical is probably the preferred
      polarization.
       
      -Joe, KD8ATU
       
      Al Pepping wrote:
      >     Anyone know  if there is a "standard" protocol for what type of
      > polarization is used for WiFi antenna systems?
      >
      >                                                                                                                                   KV8X
       
       
       
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