i like the idea of the smaller loop inside the larger one. the frame is
for an edge winding like a box loop. i could do a spiral winding for the
sw loop inside, then the nulls would be at 90 degree angles to help
avoid interaction. my purpose is to have both sw and bcb available on
the same antenna lead because my radio uses the same ant input jack for
both sw and bcb antennas. i want one portable package that eliminates
the need to change plugs to go from sw to bcb. i can mount a switch to
drop the variable across the winding i need and save wear and tear on my
plugs. thanks for your thoughts!