Kirk et al:
Thanks for the pix. I do have one item to add, though. I have a Bencher
Skyhawk Yagi on which I have grounded all the parasitic elements to the boom,
to use as a capacitive top hat for my shunt-fed tower on 160M. The tower works
well on 160M as well as on 80M with a half-sloper wire.
I shorted the Yagi's parasitics to the boom by attaching a small (3/4 X 5
inches) piece of aluminum flashing (from Home Despot) to the center of each
element with a #10 self-tapping SS screw through the center insulator. I
connected the other end of the aluminum to the boom with a SS hose clamp that I
taped over with Scotch 88 tape.
I believe the designer of the Force 12 open-sleeve fed antennas had
written on TowerTalk a few years ago that shorting the parasitics to the boom
would not impair the functioning of the antenna. Since the Bencher is a
similar open sleeve design, I had assumed the same thing for that Yagi as well,
and it seems to work just fine.
BOTTOM LINE: One ought to be able to short the outer parasitics of a Bencher
to the boom and load it on 40M (or even 30M, or both) with an Omega match as
shown on your web page.
73 de
Gene Smar AD3F
-------------- Original message ----------------------
From: K4RO Kirk Pickering <k4ro@darkstar.k4ro.net>
> On Tue, Jan 16, 2007 at 02:21:58PM -0800, N6KI Dennis Vernacchia wrote:
> > Also, is there a better choice currently on the market for a 40 meter
> > rotatable dipole under $300 ?
>
> If the end elements (reflector and last director) are
> grounded to the boom, a large tribander BOOM makes an
> excellent rotatable 40 meter dipole. Here's how I do it:
>
> http://www.k4ro.net/tcg/pix/40boom.html
>
> 73
>
> -Kirk K4RO
> _______________________________________________
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