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Our group built well over a dozen Endfed 49 to 1 baluns for resonant half wave antennas (against ground. ) FT – 140 Dash 43 from kits&parts.com in Florida Because it’s a high impedance system, even a 1 foot stake in the ground works pretty well.
After we did the project, I got to working with the spectrum analyzer and discovered we could reduce the losses even more by going to 4 turns/28 turns total. (improved design) That gets the losses considerably lower. For higher power operation, consider one or two FT– 240 Dash 43 toroids ,3 turns/21 turns. These will not have the capacitive adjustment that the commercial units have, but they will work quite well. I’ve gotten a look inside some commercial units and they are designed very similarly.
On Feb 17, 2020, at 17:33, Curt via Groups.Io <wb8yyy@...> wrote: