NEC-LIST: Fishbone antenna model (NEC-2) file

Does anyone have a NEC-2 file for a fishbone antenna?

Thanks

John Pearson

-----Original Message-----
From: nec-list-bounces+john.pearson=lackland.af.mil_at_robomod.net
[mailto:nec-list-bounces+john.pearson=lackland.af.mil_at_robomod.net] On
Behalf Of Ian Roberts
Sent: Thursday, August 12, 2004 12:25 PM
To: nec-list_at_robomod.net
Subject: Re: NEC-LIST: Wide band dipole

Hi Zvi,
You did say "dipole".
Have a look on my web site under the section on
antennas for the TV DXer "Wide band Band 1 dipole".
There you will see how to couple a simple, shortened
parasitic element, known as an "exciter element" in
the industry since the late '70s, to the dipole
element to obtain a bandwidth of about 25%.
The exiter is inductive at one end of, and capacitive
at the other end of, the bandwidth. These effects
partially compensate for the SWR build.

SWR/bandwidth is trimmed by the spacing and length of
the exciter element, so everything is interactive and
can best be modelled prior to construction.

www.qsl.net/zs6bte

Good luck,
Ian.

--- wadavis_at_vt.edu wrote:

> Try a bicone or discone. 25% for a dipole is asking
> a lot with 1.5:1 VSWR. Even with 2:1 the
> bandwidth is typically only 10% at most. Bill Davis
>
> On 11 Aug 2004 at 16:22, zvi frank wrote:
>
> > I am looking for a design for a simple design
> for a wide band dipole with
> > 25% bandwidth and VSWR of 1.5 :1. The length od
> dipole is about 1 meter. It
> > is high power and for external mounting. Any ideas
> .
> > Thanks ,
> > Zvi
>
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> The NEC-List mailing list
> NEC-List_at_robomod.net
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>

                
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