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

Tom McDermott tom.n5eg at gmail.com
Mon Sep 5 13:55:34 CDT 2016


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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