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/
