I'll be happy with a model of the 3 element SteppIR tuned to 28MHz.
This isn't the first time I've used EZNEC, but typically I start with
something similar to what I want then just modify as necessary. I
didn't find a 3 element yagi example in my batch of models from the
ARRL Antenna Book. I may have missed it if it is there.
On 4/24/06, K4SAV <RadioIR@charter.net> wrote:
> "...can anyone tell me how to plot the vertical
> pattern in EZNEC? "....
> You select the plot type as "elevation" and specify the azimuth
> direction you want , usually 0 degrees. Hit the "FF plot" button.
> If this is your first time using EZNEC, which I gather from your
> comment, I wouldn't start with the SteppIR. Use something simpler.
> To model the stepIR, all the element distances will be the same, but you
> will need different element lengths for each frequency where you want
> the results. You can get this from the numbers displayed by the control
> box. However you will have to compensate for the dielectric of the
> fiberglass tubes. Use the optional dielectric and thickness parameters
> available in EZNEC to do this. You will also have to use an estimated
> equivalent diameter of the wire, since the copper-beryllium tapes are
> flat and thin (about half an inch wide I think). There is also a small
> taper in diameter for this tape in the last 2 inches or so. You also
> need to know enough about the expected results to be confident that the
> model is correct. This is true whether you create the model yourself or
> someone else gives you one.
> Jerry, K4SAV
> Kelly Johnson wrote:
> >I'm trying to figure out the gain pattern of my 3 element SteppIR in
> >the vertical plane. Anyone have an EZNEC model already for a 3
> >element SteppIR and can anyone tell me how to plot the vertical
> >pattern in EZNEC? I haven't quite figured that out.
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