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! 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! 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! 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/
