I am in kindergarten with 4NEC2 and trying to model a Gray-Hoverman TV antenna. I have someone else's model and understand most of the file parameters. I have added VHF elements that have S curves at each end but I can't find any info as to how to model the curves. I also want to model a folded dipole. Is there any hope for me? Thanks

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    – rclocher3
    Feb 23 at 15:49
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    – Brian K1LI
    Feb 23 at 21:32

Curves must be broken into a series of straight segments. The accuracy of your results will depend on the size of the segments relative to the wavelength of operation.

For the example below, I used the Create > Loop feature of EZNEC to produce numbered segments, each of which is further broken down (see the green dots), then reconfigured into an "S" shape:

enter image description here

There are many other means and tools for doing this. I have used spreadsheets to generate segment endpoints, a feature which is now powerfully amplified in AutoEZ by AC6LA (I take no credit for this, I just appreciate and routinely use the tool's many powerful features). The spreadsheet-like formula features of 4NEC2 could also be used in this application.

I have no affiliation with any of the products mentioned in this post.

  • $\begingroup$ thanks Brian, I have this modeled in Sketchup and was able to get coord points so I could enter it into a .NEC file. 4NEC2 didn't like a 6.35mm wire and I and to reduce it to 2mm to get rid of errors but I still have warnings. But given my lack of knowledge about this program, I am surprised I have gotten this far. $\endgroup$
    – ruggb
    Feb 26 at 1:24

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