I tried everything else and once I put the yagi on no more issues. Not sure on the magic. BTW: It has a radome cover so no icing :)
On Sun, Oct 18, 2009 at 10:48 PM, Mike <m...@aweiowa.com> wrote: > Yabut, a dish "concentrates the forward radiation." So does a > panel, a slot antenna, and many others. I just wondered why you > thought a Yagi solved your problem. A 2.4G yagi has large diameter > elements compared to wavelength, not like the old VHF Yagi's, but are > prone to icing in the winter up north. What magic did you find in > the Yagi? Just curious. > > "Lucy, you got some 'splainin' to do!" Ricky Ricardo > > > > > At 09:31 PM 10/18/2009, you wrote: >>Because yagi antenna concentrates the forward radiation and response. -Lucy :) >> >>On Sun, Oct 18, 2009 at 9:48 PM, Mike <m...@aweiowa.com> wrote: >> > Rick: >> > >> > Why did it solve the problem? Better side lobe attenuation? 'Splain Lucy. >> > >> > Mike >> > >> > At 08:42 PM 10/18/2009, you wrote: >> >>I fixed a nasty multipath issue for one of my subs by using a yagi. >> >>Here are some good sources for info: >> >>http://www.wi-fiplanet.com/tutorials/article.php/1121691 >> >>www.crystalcomltd.com/...whitepapers/124102032509Berkeley_Multipath.pdf >> >>http://www.rfengineer.net/1171/rf-basics-multipath/ >> >>http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note >> 09186a008019f646.shtml >> >>-RickG >> >> >> >>On Sun, Oct 18, 2009 at 10:51 AM, Marlon K. Schafer >> >><o...@odessaoffice.com> wrote: >> >> > I don't Steve. >> >> > >> >> > But think of it like an echo. You get that first, clear >> signal coming in, >> >> > laser straight. Then at some point shortly after that you start >> >> getting the >> >> > reflections. If there are too many of them, and/or they are >> at the wrong >> >> > time the radio will get confused. >> >> > >> >> > G SHOULD handle this better than B. It's made to use >> multipath's echoes to >> >> > reassemble a complete message. Sometimes it works that way, >> sometimes it >> >> > doesn't. >> >> > >> >> > I'd have to say, for me, g is usually better with multipath >> than b though. >> >> > B handles interference better. At least that's what I'm >> seeing. I have a >> >> > tower that was giving 1 meg down 2 to 3 up, almost all customers >> >> saw that or >> >> > worse. Swapped back to b mode only and it's now a consistent >> 4 megs both >> >> > ways. >> >> > >> >> > Another thing to try is to turn down the power. Probably on >> both ends. If >> >> > you are at -69 see if you can drop your ap by 5 then 5 more >> db. Make sure >> >> > to drop the cpe by the same amount. What you are trying to do >> is move the >> >> > echo down so far that it can't be "heard". >> >> > >> >> > I've also had installs that are happiest about 2' above the ground! >> >> > >> >> > Here's a fun one for you. I've got one customer that shoots >> near a grain >> >> > elevator. Most of the year he works fine, but near harvest, >> >> every year, his >> >> > performance goes out the window. It seems that the wheat in the >> >> elevator is >> >> > moved out and the empty elevator is worse than the full one. >> >> > >> >> > Out here we have VERY long links. I have one at 18 >> >> miles. PTMP. Yet there >> >> > are also customers within 1 mile. 10 to 15 mile links are common place. >> >> > Multipath is a real head ache as the ground conditions >> change. Customer's >> >> > service will be perfect, until it snows. Or until they >> harvest a field, or >> >> > the ground dries out, or it rains etc. >> >> > >> >> > Fortunately MOST of the time this isn't an issue. But when it >> does hit ya, >> >> > it can be very hard to figure out. >> >> > >> >> > One other thing you might want to try with your customer, turn >> the radio to >> >> > the wrong polarity. You are very close to the tower so you should still >> >> > have enough signal. I've not had to do this very often, but >> it's a little >> >> > trick that has worked before. I've also pointed them 180* the >> >> wrong way and >> >> > had that work very well, especially with a grid. >> >> > >> >> > Let us know if anything helps. >> >> > marlon >> >> > >> >> > ----- Original Message ----- >> >> > From: "Steve Barnes" <st...@pcswin.com> >> >> > To: "WISPA General List" <wireless@wispa.org> >> >> > Sent: Friday, October 16, 2009 7:07 AM >> >> > Subject: Re: [WISPA] New install driving me crazy.... >> >> > >> >> > >> >> >> Marlon, DO you have or know of a good white paper on >> Multipath issues? I >> >> >> agree with your assessment but I have several locations that I have not >> >> >> been able to resolve Multipath for. I had an installation last week 3 >> >> >> miles from tower AP. Clear line of site other than going over the >> >> >> Neighbors Metal barn and between 4 metal grain bins. We could >> get a -69 On >> >> >> 50% of the property but retries were 98% No matter where we >> tried High-Low >> >> >> left right. 100 yards either way on the road and <10% retries and a -65 >> >> >> signal. I just need to some documentation to solidify my >> understanding. >> >> >> >> >> >> Steve Barnes >> >> >> Manager >> >> >> PCS-WIN >> >> >> RC-WiFi Wireless Internet Service >> >> >> >> >> >> Character cannot be developed in ease and quiet. Only through >> experience >> >> >> of trial and suffering can the soul be strengthened, vision cleared, >> >> >> ambition inspired, and success achieved. >> >> >> - Helen Keller >> >> >> >> >> >> -----Original Message----- >> >> >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >> >> >> Behalf Of Marlon K. Schafer >> >> >> Sent: Friday, October 16, 2009 9:45 AM >> >> >> To: WISPA General List >> >> >> Subject: Re: [WISPA] New install driving me crazy.... >> >> >> >> >> >> Is that a bigger or smaller antenna size than what you have now? >> >> >> >> >> >> If you moved up by 10' and increased your signal levels, what >> 1000% or so, >> >> >> I'd REALLY say that this is looking like a multipath issue. >> >> >> >> >> >> Often with multipath I've seen the signals hold well but >> performance suck. >> >> >> It'll sometimes kill the signal though. >> >> >> >> >> >> I had one install that has some power lines in the way. Fought >> >> >> intermittent >> >> >> outages etc. for over a year. His signal was OK, but not >> great. Finally >> >> >> something changes a bit and his signal dropped too low. >> >> >> >> >> >> Hmmm, bad radio. So I pulled his radio out and put in a brand new one, >> >> >> still crappy signal. >> >> >> >> >> >> Double hmmmmm >> >> >> >> >> >> I put the old radio back in, left it off the mount and moved >> it around to >> >> >> see what would happen. (I always leave 6 to 10' of cable on the mount >> >> >> just >> >> >> for things like this.) >> >> >> >> >> >> Triple hmmmmm >> >> >> >> >> >> Move the radio to the west 6' and DOWN 2' and he's got great signal, >> >> >> faster >> >> >> speeds than ever and is happy as a clam. Now one of my biggest PITA >> >> >> customers just never calls anymore. It was a very amazing >> transformation >> >> >> to >> >> >> his service. >> >> >> >> >> >> Again, there were some powerlines *close* to the path but not in it. >> >> >> Things >> >> >> actually looked pretty good to me. But not to the radio. >> >> >> >> >> >> Your symptoms look like multipath to me. We don't see it's effect very >> >> >> often, the systems handle it quite well today. But when it hits it can >> >> >> hit >> >> >> hard. >> >> >> >> >> >> laters, >> >> >> marlon >> >> >> >> >> >> ----- Original Message ----- >> >> >> From: "Mark McElvy" <mmce...@accubak.com> >> >> >> To: "WISPA General List" <wireless@wispa.org> >> >> >> Sent: Friday, October 16, 2009 4:50 AM >> >> >> Subject: Re: [WISPA] New install driving me crazy.... >> >> >> >> >> >> >> >> >>> Well before moving to the current setup, I originally had a CPQ-19, 10 >> >> >>> ft lower. It had a -80 with the same result and I was seeing a lot of >> >> >>> retries. >> >> >>> >> >> >>> -----Original Message----- >> >> >>> From: wireless-boun...@wispa.org >> [mailto:wireless-boun...@wispa.org] On >> >> >>> Behalf Of Marlon K. Schafer >> >> >>> Sent: Thursday, October 15, 2009 9:30 PM >> >> >>> To: WISPA General List >> >> >>> Subject: Re: [WISPA] New install driving me crazy.... >> >> >>> >> >> >>> Change from b to g or g to be mode. >> >> >>> >> >> >>> Turn your power WAY down. That's way too hot of a signal. >> >> >>> >> >> >>> Any metal, trees, houses, power lines etc. anywhere near the signal >> >> >>> path? >> >> >>> >> >> >>> This looks a LOT like multipath. >> >> >>> marlon >> >> >>> >> >> >>> ----- Original Message ----- >> >> >>> From: "Mark McElvy" <mmce...@accubak.com> >> >> >>> To: "WISPA General List" <wireless@wispa.org> >> >> >>> Sent: Thursday, October 15, 2009 2:30 PM >> >> >>> Subject: [WISPA] New install driving me crazy.... >> >> >>> >> >> >>> >> >> >>>> Installing a new customer, Tranzeo CPQ-19 to a MT AP, -60 signal >> >> >>> up/dn, >> >> >>>> -102 noise. About half the time I don't get name resolution and can't >> >> >>>> browse pages. This happens with two different radios. It is kind of >> >> >>>> acting like I am loosing routing or something. I also notice I will >> >> >>> get >> >> >>>> very high ping times sporadically along with drop pings. Best of my >> >> >>>> knowledge no one else having issue on this AP, about a dozen users. >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> Mark McElvy >> >> >>>> AccuBak Data Systems, Inc. >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>> >> ------------------------------------------------------------------------ >> >> >>> -------- >> >> >>>> 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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