On 2/20/2024 11:09 PM, Jim Brown wrote:
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
Polarity is just a simple case of 180 degrees out of phase.
--
Scott K9MA
k9ma@sdellington.us
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