Roy Lewallen wrote in
:

The free demo version of EZNEC available from
http://eznec.com can easily answer questions just like
this.


It refuses to calculate SWR due to multiple wires
running so close would create interactions.

Bill

There shouldn't be any problem with that antenna. Please send me the
description (.EZ) file as an email attachment, and I'll look it over.

Roy Lewallen, W7EL

William H. O'Hara, III wrote:
Roy Lewallen wrote in
:


The free demo version of EZNEC available from
http://eznec.com can easily answer questions just like
this.



It refuses to calculate SWR due to multiple wires
running so close would create interactions.

Bill

On 12-Dec-2004, "William H. O'Hara, III" wrote:

Roy Lewallen wrote in
:

The free demo version of EZNEC available from
http://eznec.com can easily answer questions just like
this.


It refuses to calculate SWR due to multiple wires
running so close would create interactions.

Bill

Hi Bill,

Not sure about EZNEC Demo, but EZNEC 3.0 models it and gives Source Data (SWR) in the 600 to 1200
ohm range. Maybe you should check your connections and try again. For what it's worth, the pattern
is like most large horizontal loops, except for two large lobes in the direction of the top corners
of the tee.

Ken Fowler

I did quickly in the middle of the night. I will
look it over and see I can find some problem with
the wires. I used EZNEC demo 4.0.

Thanks
Bill

Maybe you should check your connections and try again. For
what it's worth, the pattern is like most large horizontal
loops, except for two large lobes in the direction of the
top corners of the tee.

Ken Fowler

"William H. O'Hara, III" wrote in
. 97.142:


I did quickly in the middle of the night. I will
look it over and see I can find some problem with
the wires. I used EZNEC demo 4.0.

Thanks
Bill

Maybe you should check your connections and try again. For
what it's worth, the pattern is like most large horizontal
loops, except for two large lobes in the direction of the
top corners of the tee.


I did get it to model SWR with high reactances(to me anyways).
Does this seem right? I dunno. Thanks

Bill

On Tue, 14 Dec 2004 18:46:22 -0600, "William H. O'Hara, III"
wrote:
I did get it to model SWR with high reactances(to me anyways).
Does this seem right? I dunno. Thanks

Hi Bill,

At this point, you need to provide more specifics. One, what
frequencies? Two, did they match your experience with a physical
model?

To answer your question lacking this information, yes this seems right
- at least somewhere in the panorama of all possible outcomes. It
stands to reason that ANY antenna, when looked at across a wide enough
spectrum, will reveal both resonances and high reactances, and many
combinations in between. This is just par for the course.

Now, if you find you are experiencing these high reactances in nature
as well as in modeling; then try one thing: Break the wire at a point
that is on the opposite side of the loop from the feedpoint and see
what happens.

73's
Richard Clark, KB7QHC

Now, if you find you are experiencing these high reactances
in nature as well as in modeling; then try one thing:
Break the wire at a point that is on the opposite side of
the loop from the feedpoint and see what happens.

I haven't strung the actual one yet.
My EZNEC model got everything high. There wasn't
a frequency better than 8:1. Everything was much
higher. I am going to try with the square loop.

Bill

Bill

On Wed, 15 Dec 2004 19:04:36 -0600, "William H. O'Hara, III"
wrote:
My EZNEC model got everything high. There wasn't
a frequency better than 8:1. Everything was much
higher. I am going to try with the square loop.

Hi Bill,

Still need some particulars:
What frequencies?
What length of wire?
How high?

73's
Richard Clark, KB7QHC

On 14-Dec-2004, "William H. O'Hara, III" wrote:

"William H. O'Hara, III" wrote in
. 97.142:


I did quickly in the middle of the night. I will
look it over and see I can find some problem with
the wires. I used EZNEC demo 4.0.

Thanks
Bill

Maybe you should check your connections and try again. For
what it's worth, the pattern is like most large horizontal
loops, except for two large lobes in the direction of the
top corners of the tee.


I did get it to model SWR with high reactances(to me anyways).
Does this seem right? I dunno. Thanks

Bill

The reactive components are just an indication that the applied frequency is too high (+X), or too
low (-X). Adjust the frequency or the size of the loop till X = 0. Or just don't worry about it
and use high impedance parallel line with a tuner.

Ken Fowler