[CQ-Contest] 4 Square/ Raised Radial Questions

[David Robbins K1TTT]

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 connected
so 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
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: cq-contest-bounces at contesting.com [mailto:cq-contest-
> bounces at contesting.com] On Behalf Of k3bu at optonline.net
> Sent: Wednesday, January 30, 2008 14:41
> To: reflector cq-contest
> Subject: Re: [CQ-Contest] 4 Square/ Raised Radial Questions
> 
> 
> 
> > How can the current on the outside of the shield of the coax
> > upset a phasing
> > network that is in an all metal box?
> >
> >
> > David Robbins K1TTT
> 
> Just picture wire connecting bases of all verticals, connected at the
> phasing box.
> The best demonstration of the effect is the 3 vertical array fed by Stack-
> Match phasing unit, advertised for this purpose too.
> The result? 3 el. omnidirectional antenna, regardless where you beam.
> I have used it with three vertical array, each with 4 elevated radials,
> using baluns at the antennas, but still no difference in the pattern.
> The problem was that coax shields were connected at the phasing unit.
> Breaking the shields connections solves the problem, confirmed by other
> users.
> 
> 73 Yuri, K3BU.us
> 
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