> discom101@sohostar.net wrote:
> my first thoughts on how to do the automatic "selection" is to use series
> resonant circuits in series with the parallel resonant circuits. the
> simplest way to test it is to use 1/4w stubs. a shorted stub behaves like a
> parallel resonant circuit, and an open stub like a series resonant circuit.
> the advantage of using stubs is that they behave that way at more than one
> freq, and will lessen the "parts count". at least if it doesn't work, i'll
> find out why. i'll also be able to share my results with the group. who
> knows, somebody might come up with a better way to do it?
Is this what you are proposing?
It would present a mostly horizontal component with the stubs
serving as a small vertical component.
The stubs might just hang and be flexibly tensioned to prevent
tangling in the wind, or perhaps attached to the sides of a
non-conductive vertical center support like thick-wall PVC.
I have no idea if this would work! :-)
feedpoint
----------------
| |
Left side of folded dipole ------ ------ right side of folded dipole
* *
)!|${ {$|!) These represent pairs of stubs
)!|${ {$|!) for each of 5 bands in series
)!|${ {$|!) with each side of the folded
)!|${ {$|!) dipole inserted between each
)!|${ {$|!) side of the lower half of the
)!|${ {$|!) dipole and the feedline. The
)!|$ $|!) theory being that the signal
)!| |!) selects the most resonant path
)! !) and ignores the rest.
) )
--
Thanks! & 73, doc kd4e http://bibleseven.com
Florida Home w/Rohn 45 in concrete base & 10 acres for sale:
<http://bibleseven.cjb.cc/cjb-steelhouse-index.html>
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