Well this is what I've been doing. For the last couple years I have had multiple secorized sites with antennas mounted at the same vertical level with only 1 foot of horizontal separation and using channels 1,4,7 on 802.11b I am able to get 4mbps to the clients and I am experiencing no problems whatsoever. AP's are a mix of WAR4's and Mikrotik's all running Atheros. Towers all have 50+ clients connected.
One thing I have noticed with Horizontal sectors is that channel 10 and 11 have poor signal levels no matter what the manufacturer of the antenna but on an omni its fine. I think this must be something related to the 120 degree horizontal sector design. That's why I use 1,4,7 or sometimes 1,5,9 Kurt Fankhauser WAVELINC P.O. Box 126 Bucyrus, OH 44820 419-562-6405 www.wavelinc.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jack Unger Sent: Wednesday, April 23, 2008 11:53 AM To: WISPA General List Subject: Re: [WISPA] Sector Placement Ross, In general, physically separate them as much as possible. You do not want the transmitter signal from one sector to overload the receivers of the other sectors. That is a form of self-interference. If you happen to have a copy of my book handy, you can read more about antenna separation on pages 159 - 165. If you don't have the book, then separate 10 feet vertical as a rule of thumb. Other factors such as the amount of frequency separation and receiver selectivity also play a part but that's more engineering detail than I can address here. But now you know why you should physically separate your antennas. Many people in the past have had to move antennas apart to resolve this issue after they initially installed them to close. jack Ross Cornett wrote: > Anyone know for a fact if it is worthy to seperate sector antennas on the same tower. Using 2.4 H Pol 16 db We are readying our 31st tower location and I have been asked why do we seperate the sectors . Besides the reasonable fact that if you place 3 sectors on a 3 sided tower at the exact same height, you will never be able to climb over them or at least with great difficulty. > > I would like to know first hand examples of anyone having issues or had to move them apart to resolve any issues. I don't like doing things twice... you advise is greatly appreciated... > > Ross > > > > ____________________________________________________________________________ _________________________ > Galatians 6:7-8: "Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting." > ____________________________________________________________________________ _________________________ > > > ---------------------------------------------------------------------------- ---- > 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/ > > > > -- Jack Unger - President, Ask-Wi.Com, Inc. Serving the Broadband Wireless Industry Since 1993 Author of the Cisco Press Book - "Deploying License-Free Wireless WANs" Vendor-Neutral Wireless Training-Design-Troubleshooting-Consulting FCC License # PG-12-25133 Phone 818-227-4220 Email <[EMAIL PROTECTED]> ---------------------------------------------------------------------------- ---- 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/
