End-Fed Half-wave Antennas ~ 10/13/2024

Speaker/Presenter: Ward Silver, N0AX
Documents (including slideshow): www.dropbox.co...
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[@wildbill1]

I have 3 EFHW and have worked all over the world chasing DX. Just worked cocos and keeling island the other day from MI. Literally the other side of the world on SSB.

[@tomtwist1081]

Great presentation, but you are wrong about the loss of 43 mix. The resistive permeability is greater than the inductive at 10 MHz and up.
But the mismatch because of low inductance at lower bands explains the loss there. The inductive "loss" (mismatch) at higher
bands is low, because the the inductive reactance is higher.

[@arthurgumbus3969]

Great Presentation, especially the current and voltage graphs did help me visualize the concept. Also the small amount on the "Counterpoise" was very interesting. I run the KJ6ER POTAperformer vertical antenna with tuned raised counterpoise(s) (2). Ward can you perhaps, in the future, do a presentation on counterpoises? Lastly, I do know of some QRO folks who have installed a small FAN to the case of their EFHW transformer to cool down the torrid stack, especially with FT8. They tell me the torroids heat up quicker than they cool down. Great job. 73 Art W1SWL