[Uram-rejections] Loop Antenna 'Former' Ideas?

Mon Feb 27 22:24:36 GMT 2017

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> From webstump at chiark.greenend.org.uk Mon Feb 27 22:11:03 2017
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> From: Brian Reay <no.sp at m.com>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: Loop Antenna 'Former' Ideas?
> Date: Mon, 27 Feb 2017 22:10:54 +0000
> Organization: A noiseless patient Spider
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> On 27/02/2017 16:03, Paul wrote:
> > Brian Reay wrote:
> >> I'm considering building a VLF/LF loop.
> >>
> >> Having looked at the approaches others have taken for the former, I'm
> >> not overly taken by the idea of using wood and PVC seems a bit
> >> 'flimsy', given it will be mounted 20+ feet high and exposed to wind etc.
> >>
> >> There is a quite neat approach using a 'hola hoop' but that still
> >> leaves the support to consider and I remain unconvinced re the life of
> >> the cheap plastic when exposed 24/7 to the elements, even covered in
> >> PVC tape etc.
> >>
> >> One idea I've had is a bicycle wheel rim- if I can find a non-metal
> >> one large enough. Carbon Fibre ones are available but at very high
> >> prices. I've not given up on the idea of a wheel rim, I'm still
> >> looking for other ideas.
> >>
> >> Has anyone built such a loop? If so, how did they make the former?
> >>
> >
> > Have your "former" 3D printed ? The examples here are printed with "ASA
> > filament".
> >
> > https://rigid.ink/blogs/news/175845063-the-difference-between-abs-and-asa
> >
> > You don't have to cast a "wheel rim" as one piece. It could be
> > made as 16 pieces. But will require some thinking as to how to
> > fasten the pieces together.
> >
> > And you know the material cost will be "through the roof". It's
> > plastic. It will not be cheap. Since the printing allows any shape
> > you might want, you can reduce the mass and not make a solid-thru piece.
> >
> >    Paul
> 
> 
> 
> An interesting idea but, for a one off, probably not the way to go- 
> especially as my interest is getting a working loop, not a major 
> fabrication exercise.
> 
> 
> 
> -- 
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