rocky wrote:
To sort of sum things up, then what should I use for a choke balun on
75 meters, 77, 73 or 43 mix? More the better? I read the W2DU article
and he used 73, but I thought 77 may be better?

If you are going to have to go out and buy the cores, type 43 (and its
competitors) is way more common and cheap than any of the others. It
is also readily available in long form toroids called shield beads.

For instance, Digikey sells the Steward version of type 43 (called
type 28) beads part number 28B1122-100, with a 13.7mm hole and 28.6mm
long. This part produces about 60 ohms per bead at 4 MHz and costs
$20 for 10 pieces.
http://www.steward.com/

What diameter coax do you want to use a choke BaLun on? Generally the
smaller hole size, the more impedance you get out of a given length core.