Cecil:

Here is the crux of my fruitless attempts to use EZNEC...
With EZNEC, when I plug in the value of my gamma rod and -jxr, along with
all other elements, EZNEC spits out an error! (something about too short a
loop seems to bother EZNEC, but this short loop IS working!)
However, I am looking at a REAL and functional antenna which appears to be
well matched and receiving well.
So, I end up throwing up my hands and just using the antenna and going about
with the "cut-and-try" method! (probably just my inability to use the app)

Regards,
John
--
I would like to point out, I do appreciate the "Been there--done that!"
posts. Indeed, now your observations, comments and discourse should be
filled with wisdom--I am listening!!!
"John Smith" wrote in message
...
Cecil:

One element I do not understand in EZNEC is: say I end up with 225 ohms
inductive reactance in the gamma rod(just an example figure, use any you
please), how do I inform EZNEC I am inserting a 225 ohm capactive
reactance,
at the feedpoint to offset it?
Or, I am all wet in considering this?

Regards,
John

--
I would like to point out, I do appreciate the "Been there--done that!"
posts. Indeed, now your observations, comments and discourse should be
filled with wisdom--I am listening!!!
"John Smith" wrote in message
...
Cecil:

Your work with EZNEC is greatly appreciated here.
Your configuration is for a horz ant and I am working with a
vertical--conversion is trivial.
"A picture is worth a thousand words..." has real significance here.
I am sure an analysis of your file will provide me with insight into the
workings of EZNEC and accelerate my learning curve!

THANKS!,
John

--
I would like to point out, I do appreciate the "Been there--done that!"
posts. Indeed, now your observations, comments and discourse should be
filled with wisdom--I am listening!!!
"Cecil Moore" wrote in message
...
Cecil Moore wrote:
John Smith wrote:
I cannot find a configuration on the gamma which brings the swr under
that figure...

As Richard H. said, find the point where the feedpoint
resistance is 50 + jXL ohms. That must occur somewhere.
Then tune out the reactance with a series capacitor.

I've used EZNEC to model a gamma-fed 33' 20m dipole at
40' made out of 0.5" aluminum tubing. With a gamma element
three feet long 6" below the 33' element and a series
Xc=122 ohms, it indicates a feedpoint impedance of
49+j0.3 ohms. The EZNEC file can be downloaded by
clicking on the link below.
--
73, Cecil http://www.qsl.net/w5dxp/GAM20DIP.EZ


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