In a message dated 6/5/2002 2:49:36 PM Pacific Daylight Time,
> K2HK wrote:
> >I am attempting to model a CC X9 tribander which has trapped directors and
> log cell feed. Has anyone done this? It is a formidable project for an
> inexperienced modeler.
> This TH-6DXX model by K9UWA is the closest thing I've seen to
> what you want:
> It is a K6STI AO model so it's based on Mini-NEC. K6STI's YO programs
> (NEC-2 equivalent) also have models for KLM log-cell feed Yagi's but
> I agree with other comments that this is not a trivial task for
> an inexperienced modeler.
> 73, Bill W4ZV
> I don't think it can be done as you would have to know the "exact"
> inductance of each inductor and the capacitance of each capacitor or
> whatever form is used to insert into the software. A slight error will
> detune the antenna. I'd live with would you got unless someone has
> stumbled on to a change for the better. Erect another tower and build a
> yagi or quad and play games with that. You really can't do much even with
> that unless you can use the antenna software. You will have to bite the
> bullet and have someone teach you how to enter antenna dimensions into it
> in the XYZ coordinates. I've spent thousand of hours on Eznec and I
> wouldn't even attempt to model a trapped beam.
> I have spent many hours with a 6 band 2 element quad on tapered arms
> with great results. It reproduces. I also found that the individual
> patterns of each band ended up better for gain and F/B that possible for a
> mono bander. This was effort well spent but took a lot of experience and
> time to do. Several wise one told me this wasn't true without even trying
> it as if it was illegal if they didn't believe it. Cebic verified it and I
> saw his data also.
> Unless you know what changes to make, leave a commercial antenna alone.
> Most are well designed. Asking others to do a big job free even with all
> the data is not in the cards. Learn how to use Eznec and have some fun
> with home made beams. k7gco
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