[Elecraft] K3 going expeditionary

[Jim Brown]

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.