Eje, thanks for the lesson! -RickG On Mon, Feb 23, 2009 at 12:50 AM, <e...@wisp-router.com> wrote:
> Generally a omni send signal straight out and a high gain omni might only > have 5 to 6 degree vertical beam width. So only 2.5 to 3 deg is aim down. > A lower gain antenna will have wider beam width. But then you also have > quality antennas with electronic downtilt on them so say a high gain antenna > with 7deg beam (typical on a 12dB omni) you have 3 degree electronic downtil > (also typical value) only 0.5 degrees of the signal is sent above horizon > line. > > A 15dB omni might only have about 5 deg beam and if you have no electronic > downtilt it becomes useless on taller structures. Unless your clients are > only far out (depending on hight might have to be very far out). > > You can play with my down tilt calculator. > http://www.wisp-router.com/calculators/downtilt.php > > You do not want to have customers closer then the inner -3dB radius and > most of them should be close to the sweet spot and of course they should not > be outside outer -3dB (with omni generally no risk unless your providing > internet to aliens. ;) ) > > /Eje > > Sent via BlackBerry from T-Mobile > > -----Original Message----- > From: RickG <rgunder...@gmail.com> > > Date: Mon, 23 Feb 2009 00:23:55 > To: WISPA General List<wireless@wispa.org> > Subject: Re: [WISPA] tower issue > > > Marlon, > > I was thinking about what you said about high gain omni antennas sending > more signal UP. With respect to direction, what's the difference between > between a high gain unit and a lower gain unit? > > -RickG > > On Sun, Feb 22, 2009 at 10:34 PM, Marlon K. Schafer <o...@odessaoffice.com > >wrote: > > > Not sure if it's related or not, but high gain omni antennas are usually > a > > great big no no. They tend to send more signal UP than in the direction > of > > the customers. > > > > I'd replace it with an 8 or 9 db unit just on principal. You'll probably > > find that most customers will actually get a BETTER signal. > > > > laters, > > marlon > > > > ----- Original Message ----- > > From: "RickG" <rgunder...@gmail.com> > > To: "WISPA General List" <wireless@wispa.org> > > Sent: Sunday, February 22, 2009 7:23 PM > > Subject: [WISPA] tower issue > > > > > > > OK, here a good one! (aka, how I spent my weekend in a blizzard!) > > > > > > One of my towers has a single WARP/StarOS connected to a 5GHz grid for > > > backhaul and a 15dBi omni for the local connections. > > > On Saturday, after making some small changes, I rebooted it and it > would > > > not > > > allow me to connect via wireless any longer - or my customers :( > > > So, I go to the tower, connect up via ethernet and everything is a > usual > > > but > > > I see all associations but only a few client have ip addresses. I can > > ping > > > the few clients but the packet loss is huge 80-90%. I then reload my > > > backup > > > but still get the same thing. I try changing channels, but still the > > same. > > > I > > > then systematically begin replacing parts starting with the radio card. > > > Eventually, I replaced EVERYTHING but still have the problem. One note: > > > occasionally, twice of maybe three times, after a reboot, all came back > > > normal. The third time, I left well enough alone for now but of course, > > > you > > > know what will happen the next time I reboot. > > > > > > Any ideas??? > > > > > > -RickG > > > > > > > > > > > > -------------------------------------------------------------------------------- > > > WISPA Wants You! Join today! > > > http://signup.wispa.org/ > > > > > > -------------------------------------------------------------------------------- > > > > > > WISPA Wireless List: wireless@wispa.org > > > > > > Subscribe/Unsubscribe: > > > http://lists.wispa.org/mailman/listinfo/wireless > > > > > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > > > > > > > -------------------------------------------------------------------------------- > > WISPA Wants You! 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