On 9/25/2025 8:27 PM, David Gilbert wrote:
"3. A common mode choke, like any other inductor, isn't going to have
much effect at a current minimum, so placing common mode chokes at
current maximum(s) along the coax seems like it would be good additional
protection ... and they aren't necessarily located at either end of the
coax. Note that this would be the current maximums for the common mode
current, not necessarily for the differential current. It would
probably require a field probe to find those points if they exist."
Dave, I don't think it would be hard to locate suitable points with an
impedance probe or RF ammeter. But adding a choke normally requires
severing the coax and installing connectors. I wonder if anyone has
looked into using several large split ferrite beads clamped over the
coax for this application. Even if their impedance was less than that of
of a good toroidal choke, they might solve the problem. I know that CM
chokes used to be made this way, but I don't know their impedance
properties.
Brian
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