On 05/10/17 14:19, John Oppenheimer wrote:
The Balun, both 1:1 and 4:1 is modeled with a perfect conventional
transformer block "A." The KX3 ATU is modeled with the L-C network block
"LC1." A five foot RG-58A/U between the Balun and KX3 is added.
A perfect transformer is not a good model for two reasons:
1) The number of turns is too low to have a leakage inductance that is
large enough to ignore, especially at lower frequencies; I think this is
particularly true for the 4:1 configuration;
2) The general wisdom seems to be that you want a lossy core, so that
the common mode current sees more of a real than imaginary impedance.
--
David Woolley
K2 06123
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