Let me try to clear something up. Just because you did an "AP scan" on one antenna and it can see the other two in the -30's doesn't mean that you are getting a full -30 signal 20mhz higher or lower. All that says is you are that loud on THAT CHANNEL. You already stated that you are using channel 1,6,11. So if that above was on channel 6 then on channel 1 and 11 the bleedover (not the proper term) will be LOWER. There is no way to measure this without a spectrum analyzer.
So by using 10mhz channels you are putting a lot more "buffer" between the channels thus reducing this bleedover. Even on 10mhz channels or even 5mhz channel you are still going to see all the antennas at -30's because when it scans "ON THOSE CHANNELS" that's how loud it is but who cares?!? Your not running them all on the same channel your running 1,6,11. Just because channels 1,6,11 are "non overlapping" doesn't mean that the radio's are that precise. If you look at a spectrum analyzer there will be a curve starting at the both edge's of the 20mhz signal and it goes down. That is the bleedover we are talking about. If the radio's were perfect there would be a straight line down at the edge of the 20mhz signal but this is how it is. This is all basic RF and many WISPS don't understand basic RF but I would suggest hanging around a two-way radio shop like I did and you will learn a lot more and hopefully help yourself out by doing so. Kurt Fankhauser WAVELINC P.O. Box 126 Bucyrus, OH 44820 419-562-6405 www.wavelinc.com -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Michael Baird Sent: Sunday, May 03, 2009 7:14 AM To: WISPA General List Subject: Re: [WISPA] Sector separation/isolation I think I didn't explain my problem clearly. 10mhz/5mhz channel sep makes no difference on how each AP see's each other on a site survey on the tower. I want to isolate the sectors from each other in a better way, they are too hot to each other and too much overlap. I was looking for good ways to do it, I have no noise problems to clients, and my channels on the 3 AP's are 1/6/11, none overlapping, and all with -100 noise floor's. Regards Michael Baird > Right now channel 1 uses channel 1, 2 and 3. Channel 6 uses 4-8. When > you go to 10MHz channels 1 will use 1 and 2. 6 will use 5, 6 and 7. > Therefore, you are no longer on adjacent channels, there is a gap of > channels 3 and 4 between. > Also, you will cut down on the amount of other noise you hear because > you listen to only half as much spectrum. > And, you will have more effective power so noise may be less of a problem. > > I am sure there are some RF savvy folks out there that can explain it > better. > > Michael Baird wrote: > >> I can try that, can you tell me why that would make a difference though >> with the AP's seeing each other at such signal levels? Will changing to >> 10mhz channel width's cause the AP's to see each other at a lower RSSI? >> >> Regards >> Michael Baird >> >> >>> Use 10mhz channels instead of 20mhz. >>> >>> Kurt Fankhauser >>> WAVELINC >>> P.O. Box 126 >>> Bucyrus, OH 44820 >>> 419-562-6405 >>> www.wavelinc.com >>> >>> >>> -----Original Message----- >>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >>> Behalf Of Michael Baird >>> Sent: Saturday, May 02, 2009 6:54 AM >>> To: WISPA General List >>> Subject: [WISPA] Sector separation/isolation >>> >>> We are still experimenting with aligning sector's on our towers. We are >>> attempting to use 3 120 degree/13db/6.5 vb/7 degree downtilt, antennas >>> to cover 360 degrees. I just inspected the towers myself, and noticed >>> they are setup at 30 degrees/150 degrees/290 degrees (so they aren't >>> right exactly). So the problem that caused me to inspect the tower was >>> the signal level I can see the other AP's at. >>> >>> AP 30 can see AP 150 at -39 and AP 290 at -42. >>> AP 150 can see AP 30 at -42 and AP 290 at -70. >>> AP 290 can see AP 30 at -39 and AP 150 at -65. >>> >>> So I'm guessing that the reason 150/290 are much higher is because of >>> the additional 20 degrees between them. These AP's are on channels >>> 1/6/11, I'm wondering if I should worry about seeing the other AP's with >>> such a hot signal, and if so what are some good ways to isolate them better. >>> >>> Regards >>> Michael Baird >>> >>> >>> ---------------------------------------------------------------------------- >>> ---- >>> WISPA Wants You! 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