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LPDA element length questions...

 
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KY5G
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Joined: 31 Dec 2019
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PostPosted: Tue Dec 31, 2019 7:55 pm    Post subject: LPDA element length questions... Reply with quote

Having a problem reasoning this one out....

The LPDA calculators/formulas give you the dipole lengths... I am assuming that these values are assuming standard dipoles in a single plane with an infinitely small feedpoint gap.

In a split boom design, I am wondering what counts toward the length of a half dipole:

1) From the element tip to its entry point into the boom half?
2) From tip to the far side of the boom it passes through?
3) If you use nuts to bolt the elements to the boom, does the nut height on "root" side of the element count as extra electrical length?

Since the booms are stacked, if the boom width "counts", you have overlapping halves of the dipole in the polarization plane...

4) Is the TOTAL length of the dipole increased by the 2x boom width overlap?

I don't know why I can't figure this out on my own... I don't want to have to answer this experimentally....

Thanks!
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