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Re: [CQ-Contest] 4 Square/ Raised Radial Questions

To: CQ-Contest@Contesting.COM
Subject: Re: [CQ-Contest] 4 Square/ Raised Radial Questions
From: k3bu@optonline.net
Reply-to: k3bu@optonline.net
Date: Thu, 31 Jan 2008 12:43:53 +0000 (GMT)
List-post: <mailto:cq-contest@contesting.com>
> 
> Sounds like something wrong with that box to me. On my 4-square the
> feedpoints are all connected by radials, the feedlines all 
> connect to the
> bases and the switchbox just like another radial... and it 
> definitely works!
> 
> 
> Just imagine how it would look if there were LOTS of radials all 
> connectedso it approximated a solid metal plane, that is what 
> the raw designs are
> compared to, a perfect conducting plane. The currents are 
> injected at the
> bases of the verticals with no need for feedlines baluns/chokes 
> or anything
> else, the model works just like the real thing... or vice versa.
> 
> David Robbins K1TTT

 
It has to do with configuration of 3 vertical array a StackMatch, using 
disconnected element as a parasitic, coax line turning that element into 
reflector, but connected shields messing up the current flow.
No problems with classic 4 squares, get patterns OK, but that 3 el was just 
plain omnidirectional. If you disconnect the shields, it works fine. Verified 
in real life.
 
73  Yuri, K3BU.us
 
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