Marlon, Yea, it's ok, we wouldn't have learned anything if it worked properly the first time. This tower is not in production, it's our first build out, we will learn. We aren't using gas-powered lightning arrestors, they are RFLinx quarter wave type arrestors.
Regards Michael Baird > I don't know. I'd guess that it could to either way. I've certainly seen > bad connectors effect rx more than tx. My GUESS is that it was related to > the amount of corrosion that can be overcome by 1 watt vs. .01 watts. I've > seen that more than once. > > I took one lightning arrestor apart and it was nothing but an air gap inside > a tube. I can't see how something like that could go goofy like we're > seeing here. But stranger things have happened. > > I'm not at all sure about the gas tube ones. I'm told that you should > change the tube in at least some of them. The gas eventually fails and > needs to be replaced. > > laters, > marlon > > ----- Original Message ----- > From: "RickG" <rgunder...@gmail.com> > To: "WISPA General List" <wireless@wispa.org> > Sent: Thursday, June 18, 2009 7:11 AM > Subject: Re: [WISPA] Radio Seperation > > > On that note. Can lightning protectors go partially bad or are they like a > fuse and either work or not? > -RickG > > On Thu, Jun 18, 2009 at 12:50 AM, Marlon K. Schafer > <o...@odessaoffice.com>wrote: > > >> Even so, the performance should be the same both ways, not tx vs. rx. >> >> I still think he needs to look at the lightning arrestors. Not sure how >> they could make a difference but that's the one thing that's unknown to >> me. >> marlon >> >> ----- Original Message ----- >> From: Travis Johnson >> To: WISPA General List >> Sent: Monday, June 15, 2009 12:05 PM >> Subject: Re: [WISPA] Radio Seperation >> >> >> Hi, >> >> I have to agree with Gino here... even at 7 degree downtilt, you are >> cutting it very close. You may want to try 5 degrees on just one sector >> and >> see if that helps. >> >> Travis >> >> >> Michael Baird wrote: >> Gino, wisp-router.com, would the downtilt affect the AP RSSI level? >> >> Antenna Height >> ft >> Downtilt Angle >> ° >> Vertical Beamwidth >> ° >> Results >> Inner -3dB Radius 0.1 Miles >> Sweet spot 0.2 Miles >> Outer -3dB Radius 5.24 Miles >> >> >> I told him 7.8, but I'm sure he didn't get dead on, just the best he >> could with his inclinometer. >> >> Regards >> Michael Baird >> Where are you running the calcs? I use >> http://www.wirelessconnections.net/calcs/AntDowntiltCalc.as >> >> With your input, I get main lobe 0.2 miles / -3db @ 7 >> >> Gino A. Villarini >> g...@aeronetpr.com >> Aeronet Wireless Broadband Corp. >> tel 787.273.4143 fax 787.273.4145 >> >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >> Behalf Of Michael Baird >> Sent: Monday, June 15, 2009 1:51 PM >> To: WISPA General List >> Subject: Re: [WISPA] Radio Seperation >> >> Gino, >> >> 145', 15 degree VB, 7.7/7.8 puts my -3d at ~5 miles. If my downtilt was >> wrong, I would think it would impact the receive on my CPE's, much more >> then on the tower AP's, maybe that's a poor assumption on my part >> though. >> >> Regards >> Michael Baird >> >> I think your downtilt is too much, whats your area and tower height? >> The beamwidth of the maxrad sector? >> >> >> Gino A. Villarini >> g...@aeronetpr.com >> Aeronet Wireless Broadband Corp. >> tel 787.273.4143 fax 787.273.4145 >> >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] >> On Behalf Of Michael Baird >> Sent: Monday, June 15, 2009 1:29 PM >> To: WISPA General List >> Subject: Re: [WISPA] Radio Seperation >> >> My sector's are Maxrad adjustable sector's horizontally polarized, >> adjusted to 120/13db, at 7.7 - 7.8 downtilt, trying to cover a 5 mile >> radius. >> Radios, are Ubiquity 400mw radio's, I've turned down to 23/200mw. >> CPE's, are Ubiquity PS2, same radio at 400mw, Horizontal antenna at 18 >> >> >> dbi. >> >> RSSI at the CPE is great, RSSI at the AP is poor often different by >> 16-20 db. >> >> I also mentioned the RFLinx Qwave lightning arrestors, this is the >> first tower we've used them on. >> >> Regards >> Michael Baird >> >> >> >> I don't think that this would be an antenna location issue. >> >> What antennas did you use and where are they pointed? >> >> Also, what output are the radios? If you use 600mw radios on the ap >> side and 100 mw radios on the rx side it'll make a difference. >> >> Also, having LOW power at the tx is almost always a good idea, >> especially when colocated like this. I usually only run 15 to 17dB >> at >> >> >> >> >> the ap's. Most of my sectors are 13dB. Yeah, I have customers at 18 >> >> >> miles with multi meg RELIABLE service this way. There are other >> customers at much shorter ranges that don't get reliable service, but >> >> >> that's caused by other issues :-). >> >> >> We run most of our cpe at pretty high power these days due to the >> need >> >> >> >> >> to blow through the overpowered competition or just over all noise >> >> >> levels. >> >> >> Anyway, what gain are the antennas and where are they pointed? How >> much downtilt etc. >> >> How far are the customers from the tower? >> >> What polarity are the antennas? All the same, or did you mix it up? >> >> What are the cpe radios? What power, what antennas etc. >> >> If you had a 15 db transmit antenna and a 15 db transmit radio >> shooting to a >> 15 dB panel at 5 miles you should see an rssi of, -83 or so. Legally >> >> >> you could have 6 more dB at the AP side giving you around -77 at the >> cpe 5 miles out. >> >> Hope this helps! >> marlon >> >> ----- Original Message ----- >> From: <m...@tc3net.com> >> To: <wireless@wispa.org> >> Sent: Saturday, June 13, 2009 1:09 PM >> Subject: [WISPA] Radio Seperation >> >> >> >> >> >> We've just installed a 3 sector 2.4 setup, at 145' with maxrad >> >> 120's. >> >> >> >> >> >> I'm noticing the receive sensitivity on the AP's are about 15-20 >> db's >> >> >> >> >> different then what I see on the CPE's, tried a Tranzeo/Ubiquity >> >> >> radio. >> >> >> I'm using Ubiquity AP's, and they work fine on another 3 sector >> setup >> >> >> >> >> I have, however this tower is an A-Frame. The tower owner won't >> allow >> >> >> >> >> outside climbers so his guy did it, and he put one on each leg at >> >> >> 145' >> >> >> back to back. If the radios were too close together even on >> different >> >> >> >> >> channels, would the RX performance on the AP exhibit this behavior? >> Only other change on this tower was RFLinx Quarter-wave arrestors in >> >> >> line. >> >> >> If I'm 3-5 miles away I can see on the CPE a RSSI of -65 to -75 for >> example, on the AP the reading would be in the -90 to not even below >> >> >> the noise floor. >> >> Any thoughts would be appreciated as always. >> >> Regards >> Michael Baird >> >> >> -------------------------------------------------------------------- >> - >> ----------- >> WISPA Wants You! 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