[Uram-rejections] Masts and antennas
webstump+uram-bounces at chiark.greenend.org.uk
webstump+uram-bounces at chiark.greenend.org.uk
Mon Feb 1 13:05:53 GMT 2016
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> From: RustyHinge <rusty.hinge at foobar.girolle.co.uk>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: Masts and antennas
> Date: Mon, 1 Feb 2016 12:44:29 +0000
> Organization: Diss Organisation
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> On 27/01/16 16:18, 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.
> Acquired a length of thick-walled aluminium tube which was a (tight) fit
> in the scaffold poles, and drawfiled a bit from the outside, then
> pressed into one end of the two top poles. Drawfiled a bit more from the
> spigot so it would fit easily into the pole below it, then drilled and
> (aluminium) rivetted the spigots in place, just to be sure.
> I never got round to drilling, threading and countersinking the other
> ends so they could be bolted together...
> I *was* going to cut a slot out of some ally pole so I could weld it
> together again, somewhat reduced. (I have an oxy-acetylene set), but an
> obliging scrap merchant saved me the trouble.
> >> 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.
> CB frequency, but generally used by 'stations' rather than 'breakers'.
> We were assured that the frequency could be used in perpetuity, or at
> least until no sets remained operational.
> No new sets were (supposed) to be imported, but defective ones could be
> repaired. The trouble for HM Gubbermint was that most of the sets were
> made from good quality components, and refused to die.
> 934 MHz is now swamped by phobile signals, and even going 'horizontal'
> isn't practical.
> >> The whole lot was very stable, and despite its position (no higher
> >> ground between it an the Urals)
> > Good heavens, where was it!
> Bunwell, in Norfolk.
> Mind you, in one direction, the Alps tended to be a bit obstructive.
> Rusty Hinge
> To err is human. To really foul things up requires a computer and the BOFH.
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