Related question - I've noticed that many multi-sector cell towers have what looks like a single vertical bar located midway between adjacent sectors. I assume this is some sort of passive tuned element that's been set up to reduce inter-antenna coupling and interference, but I have been unable to find any info on how to design or install these. Anybody out here know?
Thanks! Tom S. ----- Original Message ----- From: "Jack Unger" <[EMAIL PROTECTED]> To: "WISPA General List" <[email protected]> Sent: Wednesday, April 23, 2008 8:53 AM 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: [email protected] >> >> 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: [email protected] > > 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: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
