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A few questions about collinear coaxial antennas

by "Thomas Magma" <somewhere@[EMAIL PROTECTED] > Nov 25, 2008 at 02:55 PM

Hello,

I am about to attempt to build a UHF collinear coaxial antenna and am
trying 
to finalize a design. I have done a lot of reading and am a little
confused 
on a few things. First off I have read contradicting statements whether to

use odd or even number of 1/2 wave elements. 1, 3, 5... or 1,2,4... Also I

don't understand what the 1/4 wave whip is doing on the top without a
ground 
plane (found in most designs), is this necessary for a receive antenna?.

Instead of using coaxial cable, I will be building the 1/2 wave and 1/4
wave 
transmission lines out of ridged copper pipe with air as it's dielectric
in 
order to maximize the velocity of propagation and therefore making true
1/2 
wave elements. Does anyone see anything wrong with this approach?

Thomas
 




 24 Posts in Topic:
A few questions about collinear coaxial antennas
"Thomas Magma"   2008-11-25 14:55:52 
Re: A few questions about collinear coaxial antennas
"Jerry" <jer  2008-11-26 00:24:24 
Re: A few questions about collinear coaxial antennas
"Thomas Magma"   2008-11-25 17:04:23 
Re: A few questions about collinear coaxial antennas
"Jerry" <jer  2008-11-26 07:34:31 
Re: A few questions about collinear coaxial antennas
"Thomas Magma"   2008-11-26 09:58:56 
Re: A few questions about collinear coaxial antennas
"Jerry" <jer  2008-11-26 18:32:46 
Re: A few questions about collinear coaxial antennas
K7ITM <k7itm@[EMAIL PR  2008-11-25 22:46:32 
Re: A few questions about collinear coaxial antennas
"Thomas Magma"   2008-11-26 09:32:26 
Re: A few questions about collinear coaxial antennas
K7ITM <k7itm@[EMAIL PR  2008-11-26 10:54:07 
Re: A few questions about collinear coaxial antennas
Jeff Liebermann <jeffl  2008-11-26 09:38:07 
Re: A few questions about collinear coaxial antennas
"Thomas Magma"   2008-11-26 10:50:37 
Re: A few questions about collinear coaxial antennas [radomes an
"NoSPAM" <un  2008-11-26 20:44:22 
Re: A few questions about collinear coaxial antennas [radomes an
"Thomas Magma"   2008-11-27 10:15:01 
Re: A few questions about collinear coaxial antennas [radomes an
"NoSPAM" <un  2008-11-27 20:01:53 
Re: A few questions about collinear coaxial antennas
Jeff Liebermann <jeffl  2008-11-27 00:02:32 
Re: A few questions about collinear coaxial antennas
"Thomas Magma"   2008-11-27 10:10:25 
Re: A few questions about collinear coaxial antennas
Jeff Liebermann <jeffl  2008-11-27 14:46:10 
Re: A few questions about collinear coaxial antennas
Roy Lewallen <w7el@[EM  2008-11-28 18:55:26 
Re: A few questions about collinear coaxial antennas
Jeff Liebermann <jeffl  2008-11-28 20:10:17 
Re: A few questions about collinear coaxial antennas
Roy Lewallen <w7el@[EM  2008-11-28 20:55:31 
Re: A few questions about collinear coaxial antennas
Jeff Liebermann <jeffl  2008-11-28 23:17:00 
Re: A few questions about collinear coaxial antennas
K7ITM <k7itm@[EMAIL PR  2008-11-28 17:08:06 
Re: A few questions about collinear coaxial antennas
Jeff Liebermann <jeffl  2008-11-28 20:59:35 
Re: A few questions about collinear coaxial antennas
tucker@[EMAIL PROTECTED]   2008-12-05 08:33:13 

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