Owen Duffy wrote:
I know there is a proposition that chokes such as the W2DU balun need
only have choke impedance about 10 times the nominal Zo to be effective.
I believe that rule of thumb applies only to matched lines,
i.e. Z0 loads. The other rule of thumb that I have heard
is 5x the antenna feedpoint impedance.
--
73, Cecil
http://www.w5dxp.com