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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