[Antennas] no radial vertical antennas

Tue, 16 Apr 2002 09:41:52 -0700 (PDT)

Hello to All.
I beleive this url was posted before, nice
write up about radials.

<http://www.bencher.com/pdf_download.html#tech_notes>

enjoy
--- Ron W7MRR <[email protected]> wrote:
>  Hi Reggie:
> 
>    You have hit on a topic that causes a great deal
> of consternation among readers in this usergroup. 
> In any case, it is a valid question that you should
> have the answer to before spending alot of money on
> an antenna that fails to meet your expectations.
> 
>    The antennas hailed as "radialess" verticals are
> not really verticals at all but are end fed windoms
> utilizing loading coils and, in some cases, capacity
> hats to deliver an acceptable SWR over a number of
> bands.  They go by the name of Cushcraft R-7,
> R-7000, R-8000, the MFJ 1796 and others.  As a
> group, they do not perform as well as full size
> arrangements, but they do deliver a system that will
> get you on multiple bands, albeit with a less than
> commanding signal. This is a relative comparison,
> but one that is supported by the many users
> reporting to www.eham.com [reviews].  
> 
>    My experience with an R-7 that is roof mounted
> [35 feet off the ground] when compared to an
> inverted vee at the same height was that the
> inverted vee was 1.5 to 2.0 "S" units better on both
> receiving and transmitting on all bands [using a
> tuner on the inverted vee].
> 
>    So to answer your specific question, no I don't
> believe 1/2 of the RF is going into the ground with
> these antennas.  It is more likely being turned into
> heat.  Again, however, if you only have 3 square
> feet of horizonal space and 12-20 feet of vertical
> space available for an antenna and want to operate
> many bands, it may be the antenna of your dreams. 
> It's just alot of money to pay for an antenna that
> could be out performed by $10 worth of wire and your
> built-in transceiver antenna tuner.
> 
>    If this discussion invokes the wrath of Kahn as
> it has in the past, please read the responses
> closely.  If they speak in terms of working
> countries, DX, etc., understand that they are not
> answering your question.  They are defending a less
> than optimal investment.
> 
>    Lastly, if you really want a vertical antenna,
> you will need to consider the need for a good radial
> system.  By the time you string and bury the 100+
> radials needed for an efficient ground system, you
> will have spent many times more than what a simple
> wire antenna would cost and this is even before
> raise the vertical radiator is raised!
> 
>    Good luck and have fun.  
> 
> Ron W7MRR
> 
> 
> --- On Sun 04/14, Reginald Mackey  wrote:
> > I would like to install a vertical antenna and I
> am confused as how some
> > of
> > them are advertised to work without radials? Even
> the 80" radials
> > seem to
> > short according to typical vertical theory of
> operation. What is the
> > efficiency of these antennas? Can someone shed
> some light on these
> > antennas
> > for me? For 3 to 400 dollars I would not want to
> put 1/2 of my power into
> > the ground.
> > Thanks in Advance,
> > 
> >             Reggie
> > amateur radio station k6xr
> > in southwest Bakersfield
> > 
> > - - - 
> > 
> > Your moderator for this list is:
> > Larry Wilson KE1HZ [email protected]
> > _______________________________________________
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> > 
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=====
73's Fernando NF6Q/NNN0JYM
San Jose,CA.
CCA #01187 FISTS #8649 K2 #2330 (in it's infancy)
<http://www.geocities.com/nf6q>

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