On 7/28/2024 2:03 AM, Tom Boucher wrote:
Sorry Jim K9YC but it is incorrect to say that a loading coil at the base of an antenna, which is less than a quarter wave, will affect the high current point of the antenna. Assuming the coil is pure L with no distributed C, the current exiting the coil will be the same as that entering it.
This is an Alice in Wonderland statement -- most practical loading coils DO have distributed shunt capacity between turns. And yes, that is the simplifying assumption in the model. But it is part of an antenna, and currents in any antenna are complex, needing both magnitude and phase to describe them. And phase is established by the boundary condition, which is the open end.
73, Jim K9YC _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
