On 1/2/2024 12:49 PM, David Gilbert wrote:
I've often wondered why running a wire down the center of a tower
wouldn't create the same coaxial section as surrounding the tower
with multiple wires.
Never tried it or heard of anyone who has used the "internal wire"
method for detuning a tower. Since the goal is to reresonate the
tower to another frequency - either the entire structure or by
electrically breaking up the structure into non-resonant pieces -
at which it carries minimum current on the "interfering" frequency,
I don't know why the internal wire approach would not work at least
for the "full structure" case.
73,
... Joe, W4TV
On 1/2/2024 12:49 PM, David Gilbert wrote:
Hi, Joe.
Detuning a tower and shunt feeding a tower seem to be essentially the
same mechanism except for whether there is a feed or not, and I've often
wondered why running a wire down the center of a tower wouldn't create
the same coaxial section as surrounding the tower with multiple wires.
Has anyone successfully tried this? I couldn't find much of anything by
searching online.
Take care es 73,
Dave AB7E
On 1/2/2024 7:17 AM, Joe Subich, W4TV wrote:
A tuned skirt is a detuning kit. In essence, the skirt is a coaxial
section while a single wire is an open wire line. They work the
same way short one end, tune the open end with the appropriate
reactance (capacitor). If one knows the Zo of the line section,
determining the starting capacitance is straightforward.
I would prefer a three or six wire skirt for detuning simply because
it is easier to calculate the effective diameter(s) of the triangular
tower section and the skirt. Any errors should be systematic and
the *ratio* of the two diameters will be consistent. However, either
the single wire (loop) or skirt will work to detune a tower.
73,
... Joe, W4TV
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