On 2/20/2024 6:12 PM, K9MA wrote:
One problem I can see with several cables through one core is that the
currents in the wires may be out of phase, rather that true common mode.
Imagine the two halves of a zip cord dipole meeting at the core, then
passing through it as a transmission line. The currents would just
cancel each other out, resulting in no flux
What you're describing is out of POLARITY, not Phase. Polarity has two
values, is the positive or negative sense of a waveform, which gets
reversed by turning around the wires or running the signal through an
inverting stage.
Phase is a continuous function, measured in degrees or radians, it's
different for every frequency. So yes, it's quite likely that common
mode current (which is determined by the rest of the antenna that each
is a part of) are varying degrees out of phase with each other. And yes,
it's a very good reason not to wind multiple cables through the same core.
73, Jim K9YC
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