A choke balun allows you to go from unbalanced to balanced. If you check
Walter Maxwells site and review Chapter 21 (IIRC) of reflections. He gives a
test setup that will aid in understanding.

"RB" wrote in message
. ..
Good replies. Thanks.

So: does the commonly available choke balun (round cylinder with coax
connectors on each end, and ferrite beads inside the cylinder) allow us to
put unbalanced feed in one end, and get balanced feed on the other?

Or, are they ununs?