I haven't tried it, but you could do a simple model experiment. Model a
dipole with various different swaged sections: ignored, average
diameter, etc. Use lots of segments, and see how much the resonant
frequency changes. If those changes are really small, like 0.1 percent,
it's probably not going to make any difference in performance of, e.g.,
a yagi.
73,
Scott K9MA
On 9/29/2020 12:10 PM, jimlux wrote:
On 9/29/20 10:00 AM, Mark - N5OT wrote:
Back when I would model stuff all the time (K6STI's YO) I just put in
the swaged parts as separate segments that were the correct diameter
and length as the swaged parts. That does not really compensate for
the tiny bit of transition from larger to smaller, but my segments
were chosen arbitrarily to be halfway through that tiny bit of
transition (i.e. the combined lengths added up to the actual phisical
length of the HyGain part I was modeling. I figured no matter how
inaccurate my method was,
but does the model actually show much difference? One can get way down
in the weeds with this - put a tapered segment in that's 1 cm long,
etc. But if the wavelength is 20 meters, a 1 cm transition is 0.0005
wavelength. I'd worry more about numerical instability than model
accuracy at that point.
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Scott K9MA
k9ma@sdellington.us
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