Re: Using a dipole as a vertical

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From: Jim Morgan (alsun150!jvm@aluxs.att.com)
Date: Wed Sep 14 1994 - 08:01:54 EDT


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Amazing how some discussions never die!

The return of the RFD!

>|- feedline --|------------------- 1/2 wavelength ---------------------|
>
> |------ 1/4 wavelength ----|
>
> +______________=============================
><--------------------------------------------------------------------------O
> +--------------=============================
>
>
> ^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>coax with braid folded back over the coax center conductor only
>outer section of coax that still
>insulation and has the outer insulation.
>connector on
>end
               ^^ stick an RF choke here:
                  by winding the coax into a coil
               or by loading the coax with some ferrite beads
               or by winding the coax around a toroid core

This avoids the wasteful and tedious "pull the shield back" task and you
can use cheap whire for
                                                 ^^ this half of the dipole

Kevin Purcell, N7WIM / G8UDP xenolith@halcyon.com 206/649-6489
Seattle dBug Mac Developers SIG organiser

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Except that now you're end-feeding the dipole (Hi-Z), whereas the
original description is center-fed (Lo-Z).

Or am I missing something ?

Jim Morgan WX4D/3 jvm@aluxpo.att.com


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