On 1/23/2022 11:00 AM, Lux, Jim wrote:
but pay attention to the inherent problems with vpol being strongly
> affected by the soil properties in the area
YES!
What's interesting is that the directivity of a infinitely short dipole
is 1.5 dBi, and a full size half wave is 2.15 dBi. So a shortened
dipole with capacity hats, loading coils, or matching network will be
pretty much the same (within a 1/2 dB) as far as the far field goes for
the same center height.
YES! N6BT, the fine engineer who designed the top-performing Force 12
line of Yagis, has done some excellent work with center-fed verticals
with a lot of top and bottom loading. W6GJB and I have designed and
built several for portable operation based on his work that performed
quite well.
73, Jim K9YC
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