Thank you, Billy, but I already have several ARRL Antenna Books plus a
fairly extensive library in this area, including all the texts from
undergrad and grad school. And I have read them. And understand them. And
use them.
I suggest that if you really believe what you have written, you take on Roy
Lewallen W7EL, Walt Maxwell W2DU, and LB Cebik and see if you can convince
them of the error of their ways.
Roy will tell you that theoretically an antenna as short as you can make it
and still attach some feeders would radiate only 0.45 dB less power
(somewhere) than would a full-size dipole provided that both were delivered
the same amount of power and both were in the same location, etc.
Walt makes similar statements, as does LB.
This is nothing new and should not come as a surprise. A dipole can be
shorter than full-size and as long as it is not too short, its performance
is little different from its big brother. Of course, there are limits, but
common sense suggests that. The commonly accepted figure for the lower limit
on a given band is the 0.3 wavelengths that I quoted. More conservative
authors have chosen 0.375 wavelength as their recommended lower limit. The
difference between the two is trivial as a few minutes with Roy's EZNEC will
show you.
In fact, why don't *you* invest in Roy's program and judge the validity of
these - to you - debatable matters for yourself. Might be some surprises in
there . . . give you something to do during the coming sunspot lull.
I really do have a pretty good idea how those wires in the trees work,
Billy, and mine work very well.
Thanks for your concern and suggestions, but thank you, I'll pass for now.
And now that we have each had a turn, this thread is ended, at least at this
end. Surely there are important ORION things to talk about . . .
73/72, George
Amateur Radio W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"Starting the 58th year and it just keeps getting better!"
w5yr@att.net
----- Original Message -----
From: "Billy Cox" <aa4nu@ix.netcom.com>
To: <tentec@contesting.com>
Sent: Monday, October 20, 2003 10:49 PM
Subject: Re: [TenTec] Re: Rudimentary SWR question...
> >It turns out that any wire antenna that is at least 0.3 wavelengths long
on
> >a given band will radiate a signal whose strength is almost immeasurably
> >different from that of a half-wave dipole.
>
> Whoa ... I'd suggest some time with one of the various antenna
> textbooks, ARRL or otherwise, and try to unpack that statement,
> as there's just too many possible ways for that to NOT be true
> as stated above. Things like "At WHAT wave angle?" would be
> the first qualifying question. 50 miles away or 5000?
>
> Christmas is coming, if you don't have one on your shelf now, for
> any person who really desires to KNOW how that wire hanging in
> that tree really works ... invest in one of the antenna textbooks and
> during the next solar flare, spend some interesting time learning
> what REALLY happens. As some of the other posts have indicated,
> there's MUCH more than what seems to meet the eye going on.
>
> 73 Billy AA4NU
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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