[TowerTalk] Vertical Pattern of a yagi

K4SAV RadioIR at charter.net
Mon Apr 24 15:33:26 EDT 2006

"...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.
>TowerTalk mailing list
>TowerTalk at contesting.com

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