No Cecil it is not about transmission lines it is about a parallel circuit
that radiates. Most of this group are Americans so they all read a book for
a formula that might fit what we are talking about.
One trots out a simple formula for the Q of a parallel circuit and yells
Eureeeeeka and they all follow like Lemmings hooking themselves on this
formula that they found in a book. It is a really simple formula but did
anybody think for themselves? Ofcourse
they didn't, its a simple formula so all that is needed is to parrot it out
and follow people who yell loudly that they know what they are talking
about. Roy and Shakespeare started it off years ago,
yes Wes and many others followed suit and Walter, well he said nothing.
Now I ask you Cecil they trot out this formula for Q, it is in books
so they feel safe or it would not be in a book right?
Now I ask you Cecil if you make an antenna array and you decide that you
require an input Z for this array what other values do you need for this
very simple formula bearing in mind that is a parallel circuit containing a
capacitor of unknown value a inductance of unknown value and then come up
with an air of knoweledge. Isn't it crazy ? On top of all that they use a
formula that is in a book
without determining where it comes from and what it is relevant to and what
the simple values represent. Reg saw the problem a long while ago but I
think he looked to the sky, shook his head
and maybe snickered to himself. I am sure he knows that when
you use a formula you can't pick and choose what you insert in a formula. If
you are thinking impedance, resistance or whatever
and you have a huge physical circuit that contains yards and yards
of members that radiate as well as connecting to other passive circuits one
would figure that these radiating members would have an impact on this
simple circuit that was in a book. And right from the beginning none of them
know how long these members are and what diameter and the configuration is
even tho they keep spewing their technical garbage because after all they
are experts and thus they determine who is right or wrong, whether they be
manufacturers, antenna designers or learning amateurs.
So tell me Cecil the parallel circuit is in a book and for years I have
tried to get people to think for themselves but they can't
because this simple formula is in a book so any thinking goes out the
window. I find it unbelievable that so many technical people
this side of the pond did not even think of looking beyond a book
that has this formula in it with only three components and not one thought
about inserting figures into it and resolving things for themselves. Yup the
idea of figuring out all those resistances was too much for them so they sat
back and trotted out phrases from a book that referred to a simple bandpass
circuit possibly the size of a finger nail and then sat back and said it was
good enough for a 160 meter antenna as we can ignore the wire or radiating
members up there as being inconsequential. I ask you Cecil as one who has
also also bore the brunt of uneducated attacks what were they taught at
school over here that allowed them to bandy this formula around without
understanding what it means. No, don't tell me it is beyond anybody to
provide a reasonable explanation
all they care about is crowding around Madame Guilliotine and cheering as
somebody gets killed. Gentlemen if I can call you that
go now back to your books and figure out the pertinent figures that is
needed for this simple formula and then think about all those nasty things
you have said O and by the way remember you can add a shunt resistance if
the impedance ratio gets a bit high but then you will have to go back to a
book to find out where to put it,
I could tell you but I will refrain, a couple of years to figure it out
may be beneficial
"Cecil Moore" wrote in message
...
aunwin wrote:
Not sure what you are getting at.
Well, how about this, Art? A 1/2WL dipole is similar to a series circuit,
i.e. low resistance increasing to each side. A one wavelength dipole is
similar
to a parallel circuit, i.e. high resistance decreasing to each side.
--
73, Cecil http://www.qsl.net/w5dxp
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