Correct no counterpoise since it's such low power. I don't have any pictures of the build process, but here's the transformer that I was able to coax into the opening:
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Basically I just have the wire around the spool, and at certain intervals I've got knots where each band approximately is, akin to this video:
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I can totally send more pics later if you're interested in seeing more details! It's really handy for my circumstances.
