Butch's suggestion for multipath is to tilt the antenna up a few degrees. Worked for us the few times I have seen it.
On 4/26/09, Marlon K. Schafer <o...@odessaoffice.com> wrote: > We've actually seen quite a bit of multipath this year. Probably 3 or 4 > sites had to have the antennas moved. Several others aren't working as well > as they used to, but we've got no where to move the antennas to. > > It's a hard problem to diagnose. We had one customer that's been with us > for a couple of years now. He always had somewhat slow, but usable, speeds. > Finally things really got bad. I noticed his signal levels was WAY below > what it should have been. Ahh, I've seen the Tranzeo cpq radios go deaf > before so I put in a new radio. It was better but not right. Hmmmmmm. I > then unmounted the radio and tried moving it around a bit. (He shoots over > the road and under some BIG high voltage lines.) We ended up moving his > antenna down 2 or 3 feet and over by about 6'. His signal levels went WAY > up and his speeds more than doubled. The best part of all? He's not called > me since that day! > > In the real world we can't always avoid multipath. We can only minimize it. > When things just don't seem right on a link, it's one of the things I check > for. > > Oh yeah, out here, in the rolling hills it hits us worse in the spring. > Somewhat in the fall, but mostly in the spring. I *think* it's got to do > with how the weeds etc. deflect the signals. Either that or just the water > levels in our normally bone dry dirt. (I'm in desert country) > > I've always wanted to get one of those Berkley Varitronics units that shows > multipath. Too bad they are so blasted expensive. > > laters, > marlon > > ----- Original Message ----- > From: "RickG" <rgunder...@gmail.com> > To: "WISPA General List" <wireless@wispa.org> > Sent: Sunday, April 26, 2009 7:32 AM > Subject: Re: [WISPA] SOLVED - Signal Strengths > > > I'm not saying this is your issue but I wanted to put this out on the > list. I've heard and perhaps seen areas that have a lot of metalic > content in the ground which causes reflection. Thoughts anyone? > -RickG > > On Sun, Apr 26, 2009 at 12:10 AM, Jason Wallace <supp...@azii.net> wrote: >> Well, >> >> There was only a desert floor of dirt between me and the AP about 4 >> miles away. Not even any houses to speak of. There were no metal roofs >> directly in the way. There WAS a very large steel building perpendicular >> to >> me about 40 feet away. Also, within 2 miles, there's grain silos scattered >> around that could cause a reflection. It was either this or it was right >> at >> the edge of Fresnel effects. >> >> SOLUTION? >> >> I changed to a CPE with a higher gain (Deliberating 15dbi). I think the >> tighter antenna pattern acted like "blinders" to the out of phase signals. >> I did not have to move the installation point. 70's db. All is well. >> >> Thanks everyone, for your encouraging input. >> >> Jason >> >> PS. I'm keeping an eye on it... >> >> Josh Luthman wrote: >> >> This happens a lot with metal roofs in the way. 10 feet over, around >> the mentioned building we go from -90 to -65 >> >> On 4/25/09, Jack Unger <jun...@ask-wi.com> wrote: >> >> >> You're seeing normal RF behavior. Simply mount the antenna where the >> signal is the strongest then use your network monitoring system to keep >> an "eye" on it. >> >> Jason Wallace wrote: >> >> >> Everyone, >> >> I had trouble during an install today regarding signal strengths. >> 2.4Ghz CPE in a location that should be no problem. Moving the CPE two >> feet in any direction from the point where the CPE was installed >> increased the signal by around 20db (-90 to -70!) >> >> Any idea of what phenomenon I am dealing with? >> >> Anything I should consider as I correct this install? >> >> Jason >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! 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