I agree that sectors are *often* much better than omnis. But be careful....
http://www.isp-planet.com/fixed_wireless/technology/2008/self+interference.html Also, should have brought this up sooner. Hi gain omni antennas suck swamp water. I only have ONE that's 10dB. NON that are higher. Usually I use 8dB omni's, even then I almost always put electrical downtilt on them (you buy them with it). Read why here (going clear back to one I wrote in 2001)!!! http://www.isp-planet.com/fixed_wireless/technology/2001/antenna_primer.html Hope this helps, marlon ----- Original Message ----- From: "Marco Coelho" <[email protected]> To: <[email protected]> Sent: Monday, February 09, 2009 9:02 AM Subject: Re: [WISP] 2.4Ghz Noise Problems I'll second Marlon. Sectorize your access points. 3 120° units will lower your noise floor by 1/3 (assuming all your noise is equal directionally). This also allows for more bandwidth. Marco On Mon, Feb 9, 2009 at 10:50 AM, Marlon K. Schafer <[email protected]> wrote: > Ditch the band pass filter so that you can move your channels around. > > Use sectors where you can (two 120* units often really cover 360* pretty > well). > > Use the Mikrotik AP's and turn on the squelch function (I forget what it's > called). > > You've not told us if all customers have good los. > > Where is the noise coming from? > > What is the rssi at and from the customers? > > We need a LOT more information before we can offer any real help. > marlon > > ----- Original Message ----- From: "Chris Gotstein" <[email protected]> > To: <[email protected]>; "Mikrotik discussions" > <[email protected]>; <[email protected]> > Sent: Friday, February 06, 2009 2:27 PM > Subject: [WISP] 2.4Ghz Noise Problems > > >> We have had 2.4Ghz running on one of our towers since early 2001. About >> 2 >> years ago the noise floor got bad and we moved from a vertical omni to a >> horizontal omni. That worked very well for the 20 clients we were >> serving >> off it. Within the last month, we are again having problems with noise. >> We've replaced the antenna with a lower gain horizontal omni, replaced >> cables and even replaced the AP itself. Currently, this is a RB411AH >> with >> XR2 AP running off a 13db Omni. I have a band-pass filter that is >> blocking >> everything but channel 1. That has helped, but still seeing lots of >> noise >> and clients dropping on and off. Would moving to horizontal sectors help >> the problem, or would i be better off just dumping 2.4 for something >> else? >> I'd hate for us to spend money on 4 sectors and 3 new APs to come up >> with >> the same results. Any advice? >> >> -- >> Chris Gotstein >> Sr Network Engineer >> UP Logon/Computer Connection UP >> 500 N Stephenson Ave >> Iron Mountain, MI 49801 >> Phone: 906-774-4847 >> Fax: 906-774-0335 >> [email protected] >> *************************************** >> Register your services in our FREE WISP Locator >> http://www.part-15.org/maps/WISPSearch.asp >> *************************************** >> The PART-15.ORG WISP Discussion List >> This is a Paid Subscription Email Discussion List Service. All rights >> reserved. All content becomes the sole property of PART-15.ORG >> *************************************** >> To unsubscribe from the list: Send an email to: [email protected] >> In the Body: Unsubscribe WISP > > *************************************** > Register your services in our FREE WISP Locator > http://www.part-15.org/maps/WISPSearch.asp > *************************************** > The PART-15.ORG WISP Discussion List > This is a Paid Subscription Email Discussion List Service. All rights > reserved. All content becomes the sole property of PART-15.ORG > *************************************** > To unsubscribe from the list: Send an email to: [email protected] > In the Body: Unsubscribe WISP > -- Marco C. Coelho Argon Technologies Inc. POB 875 Greenville, TX 75403-0875 903-455-5036 *************************************** Register your services in our FREE WISP Locator http://www.part-15.org/maps/WISPSearch.asp *************************************** The PART-15.ORG WISP Discussion List This is a Paid Subscription Email Discussion List Service. All rights reserved. All content becomes the sole property of PART-15.ORG *************************************** To unsubscribe from the list: Send an email to: [email protected] In the Body: Unsubscribe WISP -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
