On 4/28/2020 6:50 PM, David Gilbert wrote:
Whether NEC accurately models the current isn't the point. You don't
need a model to know that if you push the coil out away from the center
the portion of the current between the coil and the center is higher
than it would be between that same point and the center if the coil was
at the center.
Yes, BUT you DO need a model to QUANTIFY how much better (or worse) the
performance is for variations of a design to answer questions like "Is
it worth the trouble to do all this?" W6GJB and I spent a lot of time
optimzing an 80M vertical for portable operation. We used several
variations of top and bottom capacitive loading combined with several
variations of inductive loading. None of our designs used a base loading
inductor, but we did vary their position. There were some designs that
worked awfully well electrically, but were a problem to build, or had
issues with wind.
And it's also worth it for what you can learn by going through the
process.
73, Jim K9YC
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