On 10/1/2025 7:46 AM, Jack Brindle via TowerTalk wrote:
Connectors are very important in this system. They must be added to the
analysis. Without them, we have to question the validity of the tests.
No. Common mode and differential mode currents are a characteristic of
transmission lines, and common mode can be present on 2-wire lines if
the system that includes the antenna, the transmission line, and
termination in the shack has imbalance. The mechanism by which common
mode in coaxial line is on the outside of the shield is skin effect, and
it's present in those connectors.
Soldered or crimped, the connector(s) is/are simply part of the
transmission line, carrying the differential and common mode current
that is in that system (antenna, line, shack). Depending on their
construction, they can introduce some discontinuity in the differential
circuit.
73, Jim K9YC
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