On 1/12/2026 10:13 PM, Jim Brown wrote:
Looking at what the EFHW guys are doing, the design that looks best to
me have a 2-turn primary and a 14 turn secondary,
To clarify, 2:14 turns is best for 40M; because the secondary will
resonate in the range of 20 MHz, 1:7 would be the better choice for an
antenna that be used up to its 4th harmonic.
You can see this in data from my collaborator on my earliest work on
chokes back in 2005. He has chosen to remain anonymous because he did
the work in a corporate lab, where there can be professional jealousies.
73, Jim K9YC
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