Think spotlight vs. flood light. The only way to send the signal further is to focus the beam tighter.
Call me if it's still confusing, marlon 509.988.0260 ----- Original Message ----- From: "RickG" <rgunder...@gmail.com> To: "WISPA General List" <wireless@wispa.org> Sent: Monday, February 23, 2009 10:33 AM Subject: Re: [WISPA] tower issue > Marlon, nice stuff. I agree with all that. My confusion comes from why I > cant have a high gain antenna with the same pattern as a lower gain unit? > Both should be able to be designed the same. > -RickG > > On Mon, Feb 23, 2009 at 1:13 AM, Marlon K. Schafer > <o...@odessaoffice.com>wrote: > >> Vertical radiation pattern. >> >> Read this for a better description: >> >> http://www.odessaoffice.com/wireless/antenna/how_to_pick_the_right_antenna.htm >> >> Look closely at the very first antenna pattern. >> http://www.odessaoffice.com/wireless/antenna/15_omni.jpg See how much of >> the energy goes UP instead of down. And if you look closely you'll see >> that >> the main lobe goes up instead of straight out, or, more importantly, down >> toward the customers. >> >> I buy the 8 dB Maxrad omni antennas with electrical downtilt these days. >> Almost always 4* of downtilt, but sometimes I'll go as high as 12*. >> >> If you drop from a 15 dB to a 12 you'll DOUBLE your vertical coverage >> zone. >> Or very close to it. >> >> That 15 dB omni you have probably has a 2 to 5* vertical pattern. An 8 >> dB >> will have closer to 12 or 15 (I don't remember exact numbers off the top >> of >> my head). >> >> In a nutshell, gain comes only from the focusing of energy. You can only >> get that in two plains. Horizontal and vertical. Everyone looks at two >> numbers, horizontal (omni, 120*, 180*, 90* sector etc.) and gain (15dB, >> 12dB, 6dB, 24dB etc.). For the customer side the horizontal pattern >> doesn't >> mean much because you'll point the antenna straight at the tower's >> antenna >> anyway. At the tower though, you need to cover MUCH more area, both from >> side to side AND up and down. >> >> That help? >> marlon >> >> >> ----- Original Message ----- >> From: "RickG" <rgunder...@gmail.com> >> To: "WISPA General List" <wireless@wispa.org> >> Sent: Sunday, February 22, 2009 9:23 PM >> 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! 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