Xref: utzoo rec.ham-radio:6296 sci.electronics:4034
Path: utzoo!attcan!uunet!pilchuck!dataio!prager
From: prager@Data-IO.COM (David Prager)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: Circular polarization vs omnidirectionality
Keywords: antenna
Message-ID: <1707@dataio.Data-IO.COM>
Date: 7 Oct 88 22:33:44 GMT
References: <17770@glacier.STANFORD.EDU> <5023@saturn.ucsc.edu>
Reply-To: prager@dataio.Data-IO.COM ()
Organization: Data I/O Corporation; Redmond, WA
Lines: 32


First a question. Is there a difference between a circularly 
polarized antenna and an antenna whose radiated enerty has equal vertical
and horizontal components?

If not, I'd suggest that anyone looking for an antenna with these 
characteristics check into broadcast antennas for the commercial FM band.
These antennas are well designed (usually), omnidirectional, and have
equal H and V components. The major manufacturers maintain test ranges
and do considerable research on their equipment. 

While omnidirectional, effective gain is achieved through phased
stacking of the radiating elements. Arrays of antennas can them be 
center or end fed depending on preference and mounting set up.

There is a company called Shively Labortory in Maine who publishes a 
wonderful catalog. The designs and specs for most of their line is 
publicly availible. 

I don't think that many hams need antennas that are built this beefy, 
but the design issues have already been worked out.

						David
						once upon WA3KQN


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David Prager                 (w)206-881-6444        (h)206-485-4397
Data I/O Corp
10524 Willows Rd. NE	    prager@DATA-IO.COM
Redmond, WA.                ...uw-beaver!entropy!dataio!prager
98073-9746                   or whatever works.