Short answer, yes indeed. ?For QRP the toroid core can be quite small, one inch or even smaller. ?For example, the output transformer in the QDX is handling 5W, and it is magnetically equivalent to a half inch core.
Dave
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On May 7, 2022, at 04:40, tmmlrd <leo.tommasi@...> wrote:
?Should I want to realize a more compact version for QRP only (10-20-40m with total radiator length of 12 m, not so much interested in 80m), may I use a 140-43 toroid instead of 240-43? Would the same number of turns work to obtain the same impedance ratio of 49:1?
Thanks.
