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nice ideas. Just wound pancakes with copper ribbon. Got some gardening "budding" tape to use between the layers. I laid out 5m of the acetate stuck one length of the copper ribbon, turned it over did the the other side and then rolled it all up with an extra layer of the acetate.

Had though of how that would be done. So the tape and copper dont get funky while winding? Mags

Hey Jim. Saw your coil at OUR. Have you measured the inductance and capacitance and resistance yet?Mags

One more thing.... Not sure if this was brought up before...The total for both coils is 35mh The sifi individual coil were 13.5mh and the bifi were 9mh each. The calculated resonance for the bifi using 35mh and 16.4nf is 6.1khz and the scope shot is 12.98khz. So I recalculated for 9mh which is each windings measurement and we end up with 13.1khz. So we have to only use the inductance of 1 bifi winding and the total capacitance to calculate the resonance of the bifi. Seems like there is an oddity there. Like the 2 bifi windings maybe ignore each others inductance at resonant freq? ? new puzzle part? In series it measures just like the series sifi coil, but apparently at resonance the working inductance of the bifi is 9mh.Mags

The rigol gives a lot of info. NiceMags