"Cecil Moore" wrote in message
...
Sorry, I don't know the answer. I operate my W2DU choke into close
to a pure resistance that varies between 28 ohms and 90 ohms.

Cecil - I stopped using baluns for dipoles when my neighbor's TV reception
was getting killed every time I went on 10 meters. I took out my W2AU balun,
and no more problem. Whenever I need to match higher or lower antenna
impedances now, I use a 1/4-wave length of the appropriate coax line to get
close to the antenna impedance. Works great, seems impervious to the
weather, and have never found the unbalanced feedline to balanced antenna
(dipoles & full wave loops/quads) was a problem that feeding the coax away
from the antenna in a perpendicular fashion wouldn't solve. Also, two
parallel RG-59 coax lines feed grounded verticals nicely, and a tuner or the
amp pi network can easily do the load match.

ak