Gerald,
I agree that for most "normal" situations minimum VSWR and resonance are
coincident. But I have given one example, and there are others, where
they are not.
The values I quoted were taken from EZNEC VSWR plots, and confirmed in
the VK1OD online calculator.
73,
Steve
TexasRF@aol.com wrote:
> Steve, when I plug your numbers into a transmission line program I get
> these results:283.8 j23.66 = 5.72 vswr (same as your example).
>
> 288.2 +j0 = 5.7 vswr which is just slightly lower than example #1 but
> illustrates better vswr when j=0.
>
> I did not look into the 40 +j4 case but in general, real antennas show
> a reactance change much greater than a resistance change when they are
> in the range of one half wavelength. I would expect a reactance of
> maybe 20 ohms (positive) for an increase of 5 ohms in the resistive
> value. This would show a vswr of 1.55 which is higher than the 40 +j0
> value of 1.25.
>
> Perhaps someone can model a dipole to confirm or refute this.
>
> 73,
> Gerald K5GW
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