[Antennas] FW: Butternut HF-6V Antenna

[Gene Mason]

David:    The butternut and other commercial verticals do a very good job of  feedpoint impedance matching, and work effective (good dx ant) but work betr if you use radials. For 20m add 4 pieces of wire, speaker, ins or non, length 17 ft 6 in, from ground feedpoint and the antenna will transmit on 20m even with the 20m vertical coil unit missing. 
I have used th3em for years and currently have 2 phased.2 weeks ago with 50 watts I worked N Amer, Asia, Europe all within 30 minutes on 20m, ph and cw. Good Luck and DX
--KZ5V

> Date: Sun, 18 Jul 2010 14:42:50 -0400
> From: dhallam at knology.net
> To: antennas at mailman.qth.net
> Subject: Re: [Antennas] Butternut HF-6V Antenna
> 
> I am doing a survey of the other bands too see if there are any 
> additional changes or problems.  I did try to connect my Boonton RX 
> meter to the transmitter end of the coax and I measure about 28 ohms 
> impedance.  Given that I really don't know the exact length of my feed 
> line, I really don't know what that means or exactly where on the Smith 
> chart to start to get impedance at the antenna.  I have not don anything 
> to the matching transformer.
> 
> David
> KW4DH
> 
> On 7/18/2010 2:18 PM, Ray Brown wrote:
> > ----- Original Message -----
> > From: "David C. Hallam"<dhallam at knology.net>
> >
> >
> >    
> >> I am having a problem with my Butternut HF-6V vertical antenna.  After a
> >> year or so of geed service, the 20M VSWR suddenly increased to 2:1 and
> >> nothing I have been able to do has moved it back down.  Adjusting the
> >> tap position on the coil has no effect.  I don't have an antenna
> >> analyzer and am out of ideas.
> >>      
> >    Well, you really need an analyzer. But let's try a few things.
> >
> >    First off, did your SWR change on any other band at all?
> > Second, did you re-read the theory of operation starting on page 8?
> > It discusses in great detail how it works, and how 20M is always a
> > little problematic. I'll go ahead and quote the section on 20M:
> >
> >    "On 20 meters, the entire radiator operates as a 3/8 [wave] vertical,
> > with much higher radiation resistance, and VSWR bandwidth, than
> > conventional or trapped antennas having a physical height of 1/4 [wave]
> > or less. Because the 20 meter radiation resistance will be several times
> > as greater as that of conventional vertical antennas, an electrical 1/4
> > [wave] section of 75-ohm coax is used as a geometric mean transformer
> > to match the 100-odd [level] of feedpoint impedance on that band to a 50
> > [ohm] main transmission line of any convenient length."
> >
> >    So... another thing to check - did you alter or replace the matching 75-ohm
> > coax that immediately attaches to the coil at the bottom of the antenna?
> >
> >
> >                  Ray, KB0STN
> >                  (owns 1 at home and takes care of 1 at work :-)
> >
> >
> >
> >
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