Hi Jim:
Thanks for the reply you led me to this program since I
cant afford the other one right now:
Looks like this might work for now at least
EMMCAP
Modeling of wire structures
1. Wire structures can be modeled by combining
different types of wires:
q Straight wires.
q Circular and elliptic arcs.
q Circular, elliptic and rectangular loops.
q Several kinds of tapered helices with arbitrary
orientations.
q Parabolic wires.
q Hyperbolic wires.
q Archimedian, logarithmic and tapered spirals.
q Catenary wires.
2. All wires can be loaded or excited at any
position.
3. The structure can also have finite conductivities.
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of
Jim Lux
> Sent: Thursday, December 08, 2005 6:29 PM
> To: AD5VJ Bob; towertalk@contesting.com
> Subject: Re: [TowerTalk] Radiation angle
>
>
> At 03:44 PM 12/8/2005, AD5VJ Bob wrote:
> >Does anyone know all the factors that affect the angle
of radiation
> >from a horizontal dipole.
> >
> >Height being one of course, but are there others that
> >raise or lower the angle and /or broaden or narrow the
pattern.
> >
> >Has anyone ever really done a study on this?
>
>
> Not to be glib, but the answer is yes, hundreds and
hundreds
> of people have
> studied this. Such studies, from both a theoretical and
experimental
> standpoint, form the basis for such useful programs as
NEC.
>
> Now that computers are fast enough, it's really
interesting
> to put a simple
> horizontal dipole model into a decent code that renders
the
> pattern, and
> try changing things, like the lengths of the wires, the
> position of the
> feedline, whether it droops, putting in other things
near it.
> Modeling a
> dipole over real ground takes a few seconds on a
moderately
> fast Pentium A
> couple or three hours of fooling around can be quite
interesting.
>
> I just ran a single dipole using NEC4 (using the 4NEC2
> front end) over
> Sommerfield Norton ground, and it took 2 seconds all
told to
> run the model
> and display the 3D pattern on a 3.6 GHz Pentium.
>
> A modeling program makes it easy to systematically
change
> something to get
> a good intuitive feel for what will happen. As you move
the
> dipole up, you
> can see the lobes changing. Actually, now that it comes
up,
> I wonder how
> hard it would be to render an animation of something
like this.
>
>
>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting
Towers",
> "Wireless Weather Stations", and lot's more. Call Toll
Free,
> 1-800-333-9041 with any questions and ask for Sherman,
W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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