We have a 24 dB directional antenna pointing almost directly (less than 5 degrees) in to an Air radar system transmitting at +26 dBm (if I remember correct) at 1100 MHz. The distance is about 1.5 km at a foregin location.
This seriously affected the Lucent silver card. By putting a bandpass filter in between we manage to run this link with almost no measurable disturbance on the 802.11b link. The other end of the link is located at the same roof as a 1800 GSM cell. It does not affect the performance at all. /Lars ----- Original Message ----- From: "Moebius" <[EMAIL PROTECTED]> To: "'Dirk-Willem van Gulik'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Wednesday, July 09, 2003 6:37 PM Subject: RE: [BAWUG] Cell phone arrays and WiFi Have you used a spectrum analyzer to see if it is in-band interference? If it is out-of-band, a narrow band-pass filter will make the cell site go buh bye.. If it is in-band, the cellular guys may need to install a filter. I have had UHF and VHF systems sitting right next to high power pager transmitters and with appropriate cavities, you never even knew they were there.. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dirk-Willem van Gulik Sent: Tuesday, July 08, 2003 11:22 PM To: [EMAIL PROTECTED] Subject: Re: [BAWUG] Cell phone arrays and WiFi On Tue, 8 Jul 2003, Gerard J. Cerchio wrote: > Jennifer Donnelly at Cal Com Systems assures me that > this cell installation will not affect our 802.11b network at > all. Some of our transceivers will be within 50 feet of the > cellular array. For what it is worth; at those distances, the European GSM masts in the 1800Mhz frequencies do cause the receivers of most cards to blank out due to overload when used with for example a simple omni. This is visible as short burst of no receiption and a very sudden low noise with little signal. At www.wirelessleiden.net we are currently experimenting with wave guide antenna's which have a much narrower range around the 2.2Ghz when we are deploying near a GSM mast: The whave guide: http://www.wirelessleiden.nl/wcl/cgi-bin/moin.cgi/NodeRijnVliet In the from the two sector GSM antennas, to the back/right the WiFi antenna: http://webfolder.wleiden.webweaving.org/Rijn%20en%20Vliet%20-%20July%202003/ Rijn%20en%20Vliet%20-%20July%202003-Pages/Image18.html We're not quite done testing/deploying here - so we are not quite sure yet if this solves the problems. Dw -- 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
