[Antennas] Multiband Vertical Versus Multiband Dipole (HF)

2002年10月28日 16:01:53 -0800

Why does everyone discuss this subject from standpoint that a vertical is by
default not a dipole?? Can anyone comment on the relative performance of
the a veritcal dipole and a quarter wave with (good) radials? I would also
be interested to hear how important is the distance from ground to the
bottom of a vertial dipole?
Cheers
Jan (VA7JNR)
> -----Original Message-----
> From: Dave Fouchey [mailto:[email protected]]
> Sent: Monday, October 28, 2002 6:56 AM
> To: Linden, Mike (BRC-Hes); [email protected]
> Subject: Re: [Antennas] Multiband Vertical Versus Multiband 
> Dipole (HF)
>>> Mike I can't provide definitive data but only anecdotal 
> experience. I have
> used Dipoles and verticals often over the years. Dipoles in 
> general have
> behaved better for me than MOST verticals. the exception was 
> when I used
> verticals over a very extensive ground plain, in this case 
> salt water, at
> which point they blew the Dipoles away for DX performance. 
> the only caveat
> there was that they were prone to pick up more impulse noise and storm
> static than dipoles but the difference in long haul performance was
> striking. As it is I use both to this day, with a good ground 
> radial system
> under the vertical. Your mileage may vary of course.
>>> 73's
> Dave
> WA4EMR
> Sterling Heights, MI
>> At 08:01 AM 10/28/02 -0600, Linden, Mike (BRC-Hes) wrote:
> > A lot of folks still say that a vertical radiates equally 
> poorly in all
> >directions (they should only be used if you don't have space 
> for a "real"
> >antenna). After researching it a bit, it is my contention that such
> >verticals don't have an adequate ground system or are being 
> used in areas
> >with poor ground conductivity. My goal is to have some sort 
> of support for
> >most of the bands between 10 and 80 meters.
> >
> > I'm currently running a homebrew multiband coaxial trap 
> dipole in my attic
> >at about 25 feet. However, I'm thinking ahead to when I have 
> enough time and
> >when I can convince my housing association to let me install 
> some outdoor
> >antennas. My two HF options would be a multiband vertical (I like the
> >Butternut HF9V) or a multiband dipole (I've seen some 
> designs that only add
> >significant loading on the lowest bands).
> >
> > Personally, from an aesthetic point of view, I like the 
> vertical. I would
> >be able to install it more than 30 feet from my 2-story 
> vinyl sided house
> >and would have enough room for 30 foot radials in all directions. The
> >antenna would be ground mounted. Ground conductivity in my 
> area (far west
> >Chicago suburbs) is quite good. My primary concern with the 
> vertical would
> >be increased noise due to vertical polarization. Any comments on how
> >manageable the increased noise is and how much worse it is 
> than a dipole?
> >Based on my research, the primary benefit of a vertical is 
> the low angle of
> >radiation that results when used with a good ground system.
> >
> > The dipole installation would not be as aesthetically 
> pleasing as the
> >vertical (at least from my perspective -- hi!). Due to the 
> lack of older
> >trees in my new subdivision and the layout of my lot, the 
> dipole would have
> >to run from my house straight into the back yard such that 
> the feed point
> >would drop in my back yard 30 or 40 feed from my house. 
> Probably the best
> >height I would be able to manage would be about 30 feet 
> above ground --
> >perhaps a bit lower at the far end -- I would also need to 
> come up with some
> >sort of middle support. Based in my research, the benefit of 
> the dipole
> >would be lower cost (about 100ドル) and lower noise level. 
> However, at 30 feet,
> >the angle of radiation would not be very good for DX.
> >
> > I'd appreciate feedback from folks who have had the chance 
> to compare the
> >performance of multiband verticals with multiband dipoles.
> >
> > Thanks, Michael N9BDF
> >
> >
> >
> >
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> >
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