I don’t have the cd, so if you could attach the .EZ file to an email
and send it to me off reflector I could run it with EZNEC Pro/4 and see if
it has something that requires NEC4 or perhaps requires version 6.
And before he retires from EZNEC work you might inquire of W7EL if there’s
something known about that CD.
73, Guy K2AV
On Tue, Aug 31, 2021 at 7:26 PM Karin Johnson <karinann@tampabay.rr.com>
wrote:
> Hi Guy:
>
> I am running the EZNEC model "ch11-2el-endf+hyb-80m-50ohm.EZ" model, from
> the CD that accompanies the book
>
> With no changes to the file at all.
>
> The error I get when running SWR from 3 to 4 MHz is:
>
> " All calculated data invalid due to negative calculated total power.
>
> Most likely causes are a network with difficult values, or source in a
> small loop."
>
>
>
> If I run the file " 2el-EF-commerc-hyb-80m-nocomp.EZ", it runs fine with no
> errors.
>
>
>
> I will have to compare the two files to see what the difference is.
>
>
>
> I have two 3/8 wavelength 40 meter verticals that I am going to play with
> to
> try to phase them.
>
> I have HP8753C VNA, plus HP 8405A Vector Voltmeter for test equipment.
>
> I'm going to do some simulation work first to see if the phasing project is
> even worthwhile.
>
> The two antennas are not truly perpendicular to earth. Both of them slope
> at about a 20 degree angle
>
> Relative to earth. Each antenna has a matching network at the base, which
> presents about the same
>
> Impedance compared to the other. I've not calculated mutual impedance
> just
> yet.
>
> I have a lot of experience in microwave RF design, so the math and physics
> are not new to me.
>
> Let me know if you wish to correspond with me regarding my progress, or not
> so much progress.
>
>
>
> Karin K3UU
>
>
>
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