I am sorry, I abbreviate my questions and think everyone psychic and will
know what I am thinking, it is a fault of mine, many have pointed it out to
me, I am working on correcting it (progress, as you can tell, has been
slow)... let me attempt to correct my error.
I am sure EZNEC is an excellent application. But with such applications,
you spend your time learning the application, rather than the underlying
principals; it requires you to structure yourself to fit the program. For
my hobby efforts with antennas, I would rather just learn and possess the
skills and do the calculations and design myself (I am rather eccentric this
way.)
Learning to rely on EZNEC I would just remain lazy and dependent on it and,
un-knowledgeable to the math workings and methods underneath it.
Since my son graduated college, I inherited his old "TI-83 Plus"
programmable graphing calculator. I was looking more for the actual
formulas and design methods to plug into the calculator--I would simply
translate them to basic language (maybe later assembly, its' a Z80
processor.)
The "Monopole" I had pictured in my mind was a 1/2 wave end-fed, but, I was
not sure if the gamma would even be suitable for this use--and I attempted
to leave my original question open-ended to catch this, if that was the
case.
I am glad you pointed out the center of a driven element, such as in a yagi,
is "dead" and can be attached directly to ground. If a 1/2 end-fed monopole
can be matched with gamma--would that still be the same case, only here the
"end" could be attached to a grounded mast?
Thank you for your reply, it is greatly appreciated.
Warmest regards,
John
--
Hay, if'n ya'll cun't konstructivly partecipete in this har disscusion, haw
aboot speel-checkin it fer me?
"Cecil Moore" wrote in message
...
John Smith wrote:
In other words, what set of formulas would give you length, conductor
spacing, gamma capacitor value, ratio of gamma rod to driven element
diameter, and a starting measurement for the shorting bar between
conductors-- for a given frequency?
EZNEC will give you ballpark answers that require
some adjustments to length and capacitance. The
free version of EZNEC is available at www.eznec.com.
What conditions requiring a match is the gamma best suited for?
When your electrical dipole is one piece of metal,
i.e. a physical monopole. The center of 1/2WL of
one piece of metal has the voltage equal to zero
so you cannot feed it there but you can connect
ground to there. Then feed it some distance away
from center through a parallel element and a series
capacitor.
--
73, Cecil http://www.qsl.net/w5dxp
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