[hfsig] Sidebands on Raspberry Pi WSPR carrier - how to build an ground isolation balun

[Tom McDermott]

Hi Ron, thanks for the pointer.

For use at 14 MHz, winding the two transformer windings on opposite sides
of the ferrite core
could be an issue. That causes a lot of leakage inductance, and at 14 Mhz,
depending on load
Z may attenuate the desired signal. 30 turns might be a bit much at 20
meters

Forming a bifilar twisted pair of the two windings reduces the leakage
inductance a lot.

Minimizing the interwinding capacitance would not seem to be much of a
consideration
at 60 or 120 Hertz.

-- Tom, N5EG
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