[Uram-rejections] Masts and antennas

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> From webstump at chiark.greenend.org.uk Thu Jan 28 21:54:38 2016
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> From: highlandham <highlandham.nospam at rfburns.eu>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: Masts and antennas
> Date: Thu, 28 Jan 2016 21:54:35 +0000
> Organization: A noiseless patient Spider
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> On 01/27/2016 04:18 PM, Brian Reay wrote:
> > On 25/01/16 15:34, RustyHinge wrote:
> >> On 22/01/16 22:00, Jerry Stuckle wrote:
> >>> On 1/21/2016 11:26 AM, RustyHinge wrote:
> >>>> On 16/01/16 14:49, Jerry Stuckle wrote:
> >>
> >> /snip/
> >>
> >>>>> You don't have much loading on the top of your tower.  Try a 6 element
> >>>>> HF beam.
> >>>>
> >>>> As long as the tower is up-and-downable...
> >>>>
> >>>
> >>> Even if it is, there would be way too much sway, even in a light breeze.
> >>>   The beam would have a pretty good wind load.
> >>>
> >> My old Mast had a hoistable block which located snugly at the top. The
> >> block was raised by winding a plastic rope in on a ratchetted drum.
> >>
> >> The base of it was three steel scaffold poles welded into an Eiffel
> >> tower shape, and the rest was a single mast of two aluminium scaffold
> >> poles - getting on for 60'.
> >
> >
> > Can I ask how you joined the aluminium poles? (I assume they were 'thick
> > wall' scaffold poles.)
> >
> > I've tried a couple of methods and had problems with stress and/or
> > corrosion, unless I used an 'overlap' method which means sacrificing
> > height.
> >
> >>
> >> The whole lot was braced with three (or was it four? Long time ago...)
> >> plastic ropes.
> >>
> >> On top, there was an array of 4 bayed and laid 934 MHz 10 element yagis,
> >> a 13 element 934 MHz colinear and a rotator and a small masthead amp -
> >> non-linear, a HF halfwave vertical - or sometimes, a HF Quad and rotator
> >> instead.
> >>
> >
> >
> > 934MHz? I'm curious.
> >
> >> The whole lot was very stable, and despite its position (no higher
> >> ground between it an the Urals)
> >
> >
> > Good heavens, where was it!
> >
> >
> >
> 
> 
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