[Elecraft] HF Verticals?

Fri Oct 18 20:20:05 2002

I have been following this thread with some interest.  I just bought a
Hexbeam and will be getting a WindomHSQ.  The Hexbeam will be up about 32'
(I could go higher if I got the 26' roof mounted tower instead.)  The Windom
will be mounted at about the 30' mark (center supported).  That way, I could
get the benefits of the beam, local stuff with the dipole.  I guess my
question is, would getting a vertical also be beneficial?  I have no means
to get on 80 and 160 with that antenna configuration.  I have about 70 feet
between two trees.  Both of which I may be able to get a flat top at 30
feet.

Was thinking about the Bencher (Butternut) 2 band antenna with the 30 and
160 meter kits.

Thanks!

Jason Hissong
N8XE
----- Original Message -----
From: "Stuart Rohre" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Friday, October 18, 2002 5:43 PM
Subject: Re: [Elecraft] HF Verticals?

> Thanks for the comments Earl.  I got to typing too fast and should have
> included the following:
>
> I should have clarified that extensive modeling work by L. B. Cebik,
W4RNL,
> and published by him at his www.cebik.com web site, shows that CENTER FED
> vertical dipoles, at the heights he modeled, do not show much effect from
> the addition of ground screen under them.  I refer those with questions to
> L. B.'s excellent web comments upon this point.  He has been right on with
> all his modeling, and I know from personal correspondence, he checks
things
> with all the available programs, even the professional ones, not
ordinarily
> available to hams.
>
> The bottom fed half wave, as Earl reports, certainly might suffer earth
> loss.  I have not seen modeling for this case as yet.  (End feed, with and
> without added ground under it).   I have not been worried about small
> improvements less than a dB or 2, but certainly, some might feel those
> should be pursued.
>
> Most antennas would benefit by improved RF earth in the Fresnel Zone, but
> that is out of hams control in most locations, being some 2 to 5 wave
> lengths away from the antenna.  But, this area is the one you can somewhat
> control by locating your antenna on the edge or top of a high location.
>
> vertical dipoles, (center fed),  are an underexplored resource available
to
> hams for 20m and up, and in the capacitance hat loaded forms now being
> offered, for 40m and up.  My work with 5 band models has been most
> encouraging, and our lab has acquired some more from Force 12 for our HF
> experiments.  I hope to build an all band model without loading coils
myself
> to see if there is good improvement from that effort.  I would hope to use
> parallel vertical dipoles supported by the one for the lowest band.
Sleeve
> feed would be possible it seems with such an arrangement.  That works well
> in beams and horizontal antennas thus should be a natural for the home
made
> vertical.
> 73, Stuart K5KVH
>
>
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