In a related story - don't believe the polarity markings on an antenna unless you've verified them back at the shop. We've had batches of same-model antennas come in with some (but not all) of them marked incorrectly.
Tom S. ----- Original Message ----- From: "Steve Barnes" <[email protected]> To: "WISPA General List" <[email protected]> Sent: Thursday, October 01, 2009 11:14 AM Subject: Re: [WISPA] Multipath > This is going way out there what happens if you turn your radio 90 > degrees. Last month I had a client who was installed wrong. Tower was > Horizontal and guys setup the radio vertical but it worked and they did > not know any better. I got checking the tower later and saw the client > was -79 at the tower. I called them in Chewed them out for installing > wrong and sent them back. They followed my orders and the signal at the > tower dropped to -59 I turned down the radio and stabilized it at -69. I > was happy. Next day the customer called and said could we come back and > fixed what we had changed. I started them doing pings and they were > terrible. So I drove out to the house. Messed with it for 1/2 hour. > Climbed to the radio turned it back to the Wrong Polarity and set the > power back and the speed and pings were perfect. I came back to the > office walked in the door and there was my installers standing there > waiting for an apology. I smiled, shrugged my shoulders and yelled "G > et back to work" Moral to the story if it's a very close install > sometimes it is too close and you need to make the radio work harder on a > wrong polarity. > > Steve Barnes > 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: [email protected] [mailto:[email protected]] On > Behalf Of Mike > Sent: Tuesday, September 29, 2009 3:30 PM > To: WISPA General List > Subject: Re: [WISPA] Multipath > > Multipath and/or scintillation. It looks like the sun is shining and > 65 degrees in Salem. Sun beating on that metal surface can cause > heat waves to rise in front of the antenna causing > scintillation. Sometimes this stuff is black magic and moving a CPE > a couple feet one way or another can make a world of difference. > > No trees or branches in the Fresnel zone waving in the breeze? I'd > try adjusting the tilt as suggested, them putting a pipe section in > the J mount and moving it up 2.5' or so. > > Hope you figure it out. Let the list know. > > At 01:39 PM 9/29/2009, you wrote: >>I am curious if anyone thinks this is multipath and has a suggestion on >>how to fix. >> >> >> >>This just happens to be my dads house, radio mounted to a j-mount on eve >>of house, clear LOS to tower <1 mile away, -56 signal. This eve is over >>the porch roof to the east and signal shoots over the south plane of the >>roof which is an approx 30deg angle. I was over this morning and he is >>complaining the Internet is not working and I go in to do some >>troubleshooting. I setup a constant ping to the AP and I am getting >><1ms, I start to browse and the pings jump to >300ms and random lost >>packets. >> >>Configure a new radio in the house and have a -75 signal in the house, >>try the ping thing again and all seems fine. I replace he radio on the >>roof and I am back to the poor ping times again. >> >> >> >>Now I don't understand multipath as well I should but it seems to make >>sense in this case. Is it possible to reduce or remedy without moving >>the radio to a totally different location? >> >> >> >>Mark McElvy >>AccuBak Data Systems, Inc. >> >> >> >> >> >> >> >>-------------------------------------------------------------------------------- >>WISPA Wants You! 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