I had some more cores arrive, one of which appears to be as useful as those mentioned in this blog here. This one is a binocular core from LCSC, part C498903. It is larger than the binocular core in the earlier blog.
Instead of showing you a Smith Chat of the swept response I present a plot of S11 versus frequency. This should make it easier to discern how good the transformer is. Six turns is good for HF, while 7 or 8 turns improves things at the bottom end of HF. I haven't measured a 5 turn transformer but it might be better for 6m.
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| 6t bifilar |
73's
Richard
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