Right on Dan! Seems to me that many WISP operators neglect this fact when deploying multi-sector sites. They probably don't notice a problem most of the time because the channels are lightly loaded, but I bet they'd run into throughput problems if two of more sectors are heavily loaded!
Greg DesBrisay On Wed, 2003-06-25 at 16:00, Dan Fitzpatrick wrote: > This sounds about right. Even with the standard channel separation (1,6 and > 11 BTW) you will still have some radiated signal in the opposing band. This > is because the RF filtering in most wi-fi devices isn't all that > spectacular. Putting the 2 devices in different polarization planes will > help some but since one is an omni it will transcieve in the other antenna's > physical direction anyway. > > One way you make this work would be a band pass filter on each piece of > hardware. (Take a look at: > http://www.rflinx.com/2.4GHz%20Tunable%20Amp-filter.htm ) > > In all honesty though unless one or both are transferring data at a rate that > comes close to saturation there shouldn't be that much of a problem if one > radio triggers the CD of the other. > > Dan. > > On Wed, Jun 25, 2003 at 05:28:39PM -0500, David Young wrote: > > On Wed, Jun 25, 2003 at 05:45:48PM -0400, S Woodside wrote: > > > If they're on non-interfering channels (there are 3 in USA, 1, 7, 11) > > > then no problem. > > > > Let me put this question another way. > > > > A local WISP puts two radios into each of its routers. Each radio > > attaches to a high-gain antenna: one to an omni, the other to a > > patch. They tell me they went to great lengths to achieve great > > enough separation of the two radios' signals, lengths that went *way* > > beyond tuning the radios to different channels, before one radio would > > not routinely activate the other's carrier sense (thus inhibiting > > transmissions). > > > > The lengths that they went to included moving the antennas to different > > masts, and crossing their polarization. > > > > Does anybody know if it is ordinarily so much trouble to isolate > > 802.11b radios? > > > > Dave > > > > -- > > David Young OJC Technologies > > [EMAIL PROTECTED] Urbana, IL * (217) 278-3933 > > -- > > general wireless list, a bawug thing <http://www.bawug.org/> > > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless > -- > general wireless list, a bawug thing <http://www.bawug.org/> > [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless -- general wireless list, a bawug thing <http://www.bawug.org/> [un]subscribe: http://lists.bawug.org/mailman/listinfo/wireless
