Tom Bruhns wrote:
Ah, we started out with exact geometric relationships that defined
precise points, and now we're down to 20% accuracy being OK.

Nope, we started out with a simple rule-of-thumb and here it is:

Originating the thread, alhearn wrote:
Why does the reactance peak occur slightly earlier than
half-wavelength?

I responded:
Since the monopole is purely resistive around 1/4WL and
around 1/2WL, i.e. the reactance is zero at those two
points, it is simply impossible for it to be be any
other way.

Sure looks like a simple relatively innocent rule-of-thumb to me.
Absolutely nothing said about exact geometric relationships that
define precise points. You then caused the thread to wander in
the direction of 0.0000000003 accuracy while I was thinking 20%.

I've looked back over my postings and I didn't explicitly state
what I was thinking. I thought it was implicit but I didn't explain my
differentiation between the value of maximum reactance for a dipole Vs
the value of maximum reactance for the SWR circle. My rule-of-thumb is
that they are close enough to being the same point, that for ballpark
conceptual visualization, they can be thought of as being the same point.
I apologize for not being clear on that point. It took me some time to
realize that extreme accuracy was the cornerstone of your argument
against my rule-of-thumb statements.
--
73, Cecil http://www.qsl.net/w5dxp



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