Some years ago K2GT had a series of articles in HAM
RADIO magazine on the design and construction of his
80M 4SQR. As I recall, the elements were full size,
tapered, and made of aluminum tubing. I Think they
started at 2.5 inches at the base. I might still have
the articles in my files.
73, Stew K3ND
--- "Guy Olinger, K2AV" <k2av@contesting.com> wrote:
>
> I think there is a large audience for answers to
> this question. My own
> 80 M plans revolve around the emergence of something
> of this nature.
> Please keep the discussion on the reflector. Thanks.
>
> 73, Guy.
> -----------------
>
> Guy Olinger, K2AV
> Apex, NC, USA
>
> ----- Original Message -----
> From: "Tom Rauch" <w8ji@akorn.net>
> To: <n4kg@juno.com>; <TOWERTALK@contesting.com>; "J.
> Kincade"
> <w5kp@swbell.net>
> Sent: Thursday, August 30, 2001 9:27 AM
> Subject: Re: [TowerTalk] Vertical Antenna Tubing
> Strength (was:
> Increasingeffective 4SQR array bandwidth???
>
>
> >
> >
> > > Tom, wouldn't that make 20' sections of 4"
> irrigation pipe the
> > > material of choice for large (over 40')
> verticals? Only problem is,
> I
> > > have no idea what grade of aluminum they are
> made of. 73, Jerry
> >
> > Very interesting Tom.
> >
> > I am still trying to make 80 meter verticals that
> hold up well. I was
> > thinking or irrigation tubing, but it is so soft
> and thin it scares
> me. I
> > don't mind guying it, but installing the
> irrigation tubing seems to be
> > a problem.
> >
> > I was thinking of having Hygain send me boom
> material like 2" x
> > .125 wall 6061-T6 swedged to fit the next section
> in nine 8 foot
> > sections.
> >
> > I didn't want to taper because of the shortening
> effect, and
> > bandwidth reduction, unless I can offset that with
> a hat at top.
> >
> > Is there software available for calculating
> stresses, or proven plans
> > that work for an 80-meter vertical that is easy to
> erect?
> >
> > 73, Tom W8JI
> > W8JI@contesting.com
> >
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> >
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>
>
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