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Re: [Antennaware] EZNEC how to model a 4:1 balun

To: antennaware@contesting.com
Subject: Re: [Antennaware] EZNEC how to model a 4:1 balun
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 25 Mar 2024 14:23:42 -0400
List-post: <mailto:antennaware@contesting.com>

> I am mainly interested in the impedance transformation to the 50 ohm
> feedline coax.

Why not just use Alternate SWR Zo = 200 Ohms?  That will give you the
50 Ohm SWR after the 4:1 "balun" assuming the balun is a broadband
current balun.

Otherwise, you can use a second short wire, move your source to it,
and place a *1:4 transformer* between that wire and the location of
your original source.

73,

   ... Joe, W4TV

On 3/25/2024 1:36 PM, David Gould wrote:
I am using Pro/2 v 7.0.

I have been through the EZNEC help and the test drive around the track, but the examples are all more complex than I am looking for so I am having trouble getting to the basics.

I would like to model a variation of a centre fed dipole (over a wide frequency range) that has a 4:1 balun at its feed point.   Is there an example anywhere I could use to copy from?

Currently I am just using a straight wire with the source at 50% along. Can I develop from this or do I have to split it into two separate wires?

I am mainly interested in the impedance transformation to the 50 ohm feedline coax.

Any help would be appreciated.

73,

Dave  G3UEG




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