Mike Coslo wrote:
Do the single core designs really not work? I had a single core
homebrew that seemed to work, but I'm a tad confused after hearing that
they don't.

The single core designs are usually voltage baluns and
what we hams want are balanced currents. I don't see
why you couldn't just add a husky 1:1 W2DU style choke
on the 50 ohm side of your 4:1 voltage balun to inhibit
common mode current. The extra toroid in the afore mentioned
QEX article is a 1:1 choke attached to a 4:1 voltage balun.
--
73, Cecil http://www.qsl.net/w5dxp