Check the drawing in attachment, I don't remember who designed it, I just
saved the picture from the website.
It gonna be sturdier than Hy-Gain, because the bottom 30+ feet are 12'
sections of 2", 1 7/8" and 1 3/4" tubes.
2007/8/20, Neal Campbell <nealk3nc@gmail.com>:
>
> Thanks all
>
> I think I am going to try it. I definitely was going to replace the
> hose clamps (I dont even use them on yagis anymore) and the area is
> very wind protected (read, hot in the summer time) plus, it costs $165
> on the web which is not too much money for this experiment!
>
> 73
> Neal k3nc
>
> On 8/20/07, jeremy-ca <km1h@jeremy.mv.com> wrote:
> > If using a steel mast then first calculate the RF resistance at the
> > frequency of operation. The RF integrity at the various junctions is
> also
> > far from ideal.
> >
> > Aluminum is still the best for a radiator and with several others
> helping on
> > the guys that HyGain mast should go up OK. They wouldnt be selling them
> if
> > they didnt work.
> >
> > One way to secure the sections is to drill a small hole thru the
> louvered
> > part of the hose clamp into the mast and secure with a SS #6 self
> tapping
> > screw. Dont use a screwdriver to tighten the clamps, a socket on a
> ratchet
> > wrench gives more torque. Assemble the sections with a small amount of
> > Penetrox or similar to protect against corrosion.
> >
> > Carl
> > KM1H
> >
> >
> >
> > ----- Original Message -----
> > From: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>
> > To: <towertalk@contesting.com>
> > Sent: Monday, August 20, 2007 2:16 PM
> > Subject: [TowerTalk] Hygain pushup masts for 80m verticals?
> >
> >
> > > Hi Neal,
> > >
> > > If you are writing about the mast that's aluminum, 65 feet tall and
> uses
> > > 11
> > > six foot sections, I'd avoid it myself. The bottom is 2" o.d. and
> this
> > > tapers down to around .6" at the top. Personally, I do not like the
> idea
> > > of
> > > 11 sections (too rickety), and I don't like the idea of all of them
> being
> > > held by friction with hose clamps. All that plus it being aluminum
> and my
> > > feeling is that you'll be guying a wet noodle. Steel mast is bad
> enough
> > > at
> > > that height but at least it has enough rigidity to be guyable. If
> you
> > > want
> > > 60 feet cheap, the best height/dollar way I know of is to get one of
> those
> > > 50 foot steel pushup masts and put it on an insulator and use some
> sort of
> > > stainless steel whip on top to get the last 9 or 10 feet. You'll have
> to
> > > guy it and you'll need help putting it up but if you do it right it
> should
> > > stay up. The aluminum mast may be another story.
> > >
> > > Another way is to get 4 used sections of rohn 20 or 25, stack them and
> go
> > > the last 20 feet with an aluminum tube from Penninger Radio. This is
> > > actually better except that you have to figure out how to insulate the
> > > tower
> > > base and prevent a reaction between the aluminum and the zinc galv. on
> the
> > > top tower section. You'll have to guy the tower part at its top.
> > >
> > > 73,
> > >
> > > rob / k5uj
> > >
> > > _________________________________________________________________
> > > See what you're getting into.before you go there
> > >
> http://newlivehotmail.com/?ocid=TXT_TAGHM_migration_HM_viral_preview_0507
> > >
> > >
> >
> >
> >
> --------------------------------------------------------------------------------
> >
> >
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> > >
> >
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> >
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