Article View: sci.electronics
Article #19878Re: Circular polarization vs omnidirect
From: commgrp
Date: Fri, 07 Oct 1988 14:34
Date: Fri, 07 Oct 1988 14:34
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>I have an antenna on VHF that might have the properties you're >looking for. It is from FAA surplus and is labeled circularly >polarized, so I guess it is. It's rather hard to describe, but >here goes. The elements are swastika shaped.... > >I assume the FAA wants this kind of antenna to receive equally well >from airplanes in all directions; and circularly polarized so it >doesn't care about the orientation of the (linearly polarized) antenna >in the plane. > >haynes@ucscc.ucsc.edu Circular polarization helps eliminate "mobile flutter" and other polarization-related effects. Another reason for the unusual shape of FAA antennas is to achieve omnidirectionality without a null zone directly overhead, like that produced by a simple vertical. -- Frank W9MKV reid@gold.bacs.indiana.edu
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!pyrdc!pyrnj!rutgers!iuvax!silver!commgrp From: commgrp@silver.bacs.indiana.edu Newsgroups: sci.electronics Subject: Re: Circular polarization vs omnidirect Message-ID: <7200015@silver> Date: 7 Oct 88 14:34:00 GMT References: <17770@glacier.STANFORD.EDU> Organization: Indiana University CSCI, Bloomington Lines: 25 Nf-ID: #R:glacier.STANFORD.EDU:-1777000:silver:7200015:000:814 Nf-From: silver.bacs.indiana.edu!commgrp Oct 7 09:34:00 1988