[Antennas] Vertical question re current balun

[w6oa at juno.com]

The vertical will be a 3/8 wave ground mounted with 4 slightly elevated
radials
fed at the base through a series capacitor to tune out the inductive
reactance 
which by rights would pretty well make the feedline look into 50 ohms.

Just thought if the I balun were located 1/4 wave from the feed point the
feedline 
between the balun and feed point would act like one more radial.

73, Don, W6OA/7
Winlock, WA


On Mon, 05 Feb 2007 15:34:45 -0600 "James Duffer"
<dufferjames at hotmail.com> writes:
> Is there a reason you want to put it 1/4 wave from the feed point.  I 
> am 
> guessing that a 1/4 wave vertical antenna has a failrly low 
> impedance at the 
> feed point.  If it is lower than the Zo of your coaxial feed line, 
> the 
> impedance would be transformed to higher than Zo at the 1/4 wave 
> distance 
> from the feed point.  Whether that makes it a good place to put a 
> current 
> balaun (choke) I wouldn't know.  Hopefully someone will say that 
> they have 
> tried it, and let you know the results favorable or unfavorable.
> 
> 73, Jim
> 
> 
> >---- w6oa at juno.com wrote:
> >
> >=============
> >What, if any, advantage would there be by putting a current balun 
> a
> >quarter wave from the feedpoint of a vertical?
> >
> >Tnx es 73
> >Don, W6OA/7
> >Winlock, WA
> >
> >
> 
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