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Marconi, your folded 1/4 wave groundplane example may represent a similar physical and electrical circuit, however it in no way accounts for the PAIR of currents present on the cone that form the 1/4 wave pattern with a current peak towards the center. You also cannot expect a parasitic element to represent the phase we see on the cone. The phase of parasitic elements mimics the phase of the driven element in your example.

You recognize other end fed antennas would have CMC issues if it were not for the addition of decoupling radials. Why would you think the half wave end fed portion of this antenna did not develop CMC of if you think it does, why wouldn't they be present on the resonant cone?

One you understand that they are present and their path is from the base of the inside of the cone and fold over the top of the cone onto the outside surface, you understand how that current is 1/2 wavelength long and the phase shift between the bottom of the inside and the bottom of the outside is 180 degrees.

You would also understand why it is important for DB's model to show the extra wires connected to the top of the cone since that mimics the current flow and phase much better than a simple parasitic element.

<blockquote data-quote="Shockwave" data-source="post: 499374" data-attributes="member: 10882">Marconi, your folded 1/4 wave groundplane example may represent a similar physical and electrical circuit, however it in no way accounts for the PAIR of currents present on the cone that form the 1/4 wave pattern with a current peak towards the center. You also cannot expect a parasitic element to represent the phase we see on the cone. The phase of parasitic elements mimics the phase of the driven element in your example.&nbsp;You recognize other end fed antennas would have CMC issues if it were not for the addition of decoupling radials. Why would you think the half wave end fed portion of this antenna did not develop CMC of if you think it does, why wouldn&#039;t they be present on the resonant cone?&nbsp;One you understand that they are present and their path is from the base of the inside of the cone and fold over the top of the cone onto the outside surface, you understand how that current is 1/2 wavelength long and the phase shift between the bottom of the inside and the bottom of the outside is 180 degrees.&nbsp;You would also understand why it is important for DB&#039;s model to show the extra wires connected to the top of the cone since that mimics the current flow and phase much better than a simple parasitic element.</blockquote>

[QUOTE="Shockwave, post: 499374, member: 10882"] Marconi, your folded 1/4 wave groundplane example may represent a similar physical and electrical circuit, however it in no way accounts for the PAIR of currents present on the cone that form the 1/4 wave pattern with a current peak towards the center. You also cannot expect a parasitic element to represent the phase we see on the cone. The phase of parasitic elements mimics the phase of the driven element in your example. You recognize other end fed antennas would have CMC issues if it were not for the addition of decoupling radials. Why would you think the half wave end fed portion of this antenna did not develop CMC of if you think it does, why wouldn't they be present on the resonant cone? One you understand that they are present and their path is from the base of the inside of the cone and fold over the top of the cone onto the outside surface, you understand how that current is 1/2 wavelength long and the phase shift between the bottom of the inside and the bottom of the outside is 180 degrees. You would also understand why it is important for DB's model to show the extra wires connected to the top of the cone since that mimics the current flow and phase much better than a simple parasitic element. [/QUOTE]

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