Of course it applies. Mother nature does not pay attention to what we
CALL things. It is quite common for DC and mains power to carry AF and
RF currents. That's how most noise is radiated -- as a common mode
signal on cables connected to equipment that includes noise sources.
BTW -- as Vice-Chair of AES Standards Committee for 20 years, I HAVE
studied this stuff extensively, along with colleagues around the world
with excellent engineering chops.
73, Jim K9YC
On 8/24/2020 8:47 AM, Rich NE1EE wrote:
Well...this reply covers a lot of ground. We are addressing power lines running
DC, not signal lines with high freq signals? Even audio moves the question from
DC to audio frequencies. I have seen coupling of AC to very long DC signal
wires (current loop or voltage sensors, such as RTD), but I am addressing
hundreds of meters. I have not looked at the effect for shorter wires running
essentially DC, in an environment where there are high freq signals to couple.
But then, I included the inline filter from the start, so I don't know if it
did any good or not. For $30 (I think?), it was not worth thinking about. I'm
familiar with twisting, crosstalk, etc, for signals, but not sure that it
translates to DC power supplies of short length.
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