----- Original Message ----- From: "Marlon K. Schafer (509) 982-2181" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Friday, December 08, 2006 9:22 PM Subject: Re: [WISPA] using diversity outdoors
> First, if you think it's multipath try moving the antenna. I've had some as > low as 2' above the ground to get the best signal and speeds possible. I've > had a couple, maybe even a few, where moving 2 to 3 feet up or down (often > down) seems to do the trick. We tried moving the antenna. It didn't have much effect. We tried up and down and even a little side to side... didn't mean much. I HAVE had moving the antenna just a foot upwards change an unworkable link to a rock solid stable one. Seemed it was a roof reflection, with the antenna at the peak of the roof. > > As for running diversity, it'll be a trial and error thing. Two things seem > to happen with multipath. You could be getting a signal out of phase or > polarity shifted. Or both. Well, that much I assumed. > > If you try it you'll want the antennas 3 to 10 feet vertically separated. > You'll have to try and see if the same or cross polarity is the key for your > customer. What about horizontally? All our sites are hpol. > > I've found that multipath seems to be really really rare in the wild. > Usually it's something else. Well, viewed from the customer end, we're going over one house, between two, and just over a well-travelled road. While most customers are generally rock-steady with signal moving perhaps a db or two now and then, this one's about 10 db weaker than it should be and fluctuates constantly 2-4 db. It was improved by moving the antenna upwards 18 inches, but it's still not stable, and more vertical height is probably not in the cards. > > Marlon > (509) 982-2181 Equipment sales > (408) 907-6910 (Vonage) Consulting services > 42846865 (icq) And I run my own wisp! > 64.146.146.12 (net meeting) > www.odessaoffice.com/wireless > www.odessaoffice.com/marlon/cam > > > > ----- Original Message ----- > From: "Mark Koskenmaki" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Friday, December 08, 2006 9:00 PM > Subject: [WISPA] using diversity outdoors > > > > What would be the advantage (if any) to using two antennas on the client > > in, > > connected to a CM9 and running in 'diversity' mode, where both antennas > > point to the same AP? > > > > I have had one client that seems to have some ugly multipath issues, and > > rather unstable signal levels and poor stability concerning pings. > > > > Is there any rules to follow, if I try two antennas? > > > > Thanks > > > > > > > > +++++++++++++++++++++++++++++++ > > neofast.net - fast internet for North East Oregon and South East > > Washington > > email me at mark at neofast dot net > > 541-969-8200 > > Direct commercial inquiries to purchasing at neofast dot net > > > > -- > > WISPA Wireless List: wireless@wispa.org > > > > Subscribe/Unsubscribe: > > http://lists.wispa.org/mailman/listinfo/wireless > > > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > -- > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
