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

[webstump+uram-bounces at chiark.greenend.org.uk]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

 Please do not use this sig. in this group



The post that you submitted to uk.radio.amateur.moderated has been rejected by a
moderator. 

Your message appears to the moderator to be abusive or hurtful to
another contributor.

The group charter and moderation policy can be found at
  http://www.chiark.greenend.org.uk/uram/
Disputed moderation decisions can be discussed in the newsgroup
  uk.net.news.moderation

============================================ Full text of your message follows
> From webstump at chiark.greenend.org.uk Mon Feb 27 22:19:25 2017
> Return-path: <webstump at chiark.greenend.org.uk>
> Envelope-to: webstump+?@slimy.greenend.org.uk
> X-Envelope-To: uk-radio-amateur-moderated at usenet.org.uk
> X-Forwarding-To: uk-radio-amateur-moderated at usenet.org.uk
> Delivered-To: forwarding-uk-radio-amateur-moderated at usenet.org.uk
> X-Virus-Scanned: amavisd-new at example.com
> To: uk-radio-amateur-moderated at usenet.org.uk
> From: Brian Reay <no.sp at m.com>
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: Loop Antenna 'Former' Ideas?
> Date: Mon, 27 Feb 2017 22:19:18 +0000
> Organization: A noiseless patient Spider
> Message-ID: <o928hh$gq9$1 at dont-email.me>
> References: <o919b3$lev$1 at dont-email.me>
>  <Z6aS4fgeiEtYFwyW at b-howie.demon.co.uk>
> Mime-Version: 1.0
> Content-Type: text/plain; charset=windows-1252; format=flowed
> Content-Transfer-Encoding: 7bit
> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0)
>  Gecko/20100101 Thunderbird/45.7.1
> X-Auth-Sender: U2FsdGVkX18DjZESJX/8A1EMovG7+FC438fhPAsqF5I=
> Cancel-Lock: sha1:7N2HWV4lujPeAfKVj6BGclxbw3s=
> X-Gradwell-Message-ID: 49942580
> X-Gradwell-MongoId: 58b4a5e8.20c9-836-9
> X-Gradwell-Forwarding-Rule: 1748292
> X-Gradwell-Edge-Server: inbound-edge-9.mail.thdo.gradwell.net
> 
> On 27/02/2017 15:41, Brian Howie wrote:
> > In message <o919b3$lev$1 at dont-email.me>, Brian Reay <no.sp at m.com> writes
> >> 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?
> >>
> >
> >
> > I've  5ft octagonal loop in copper pipe. .I used 135 degree yorkshire
> > fittings and soldered it all up. The only problem I had was capacitance
> > between the windings and the screening tube, meaning I had to reduce the
> > number of turns and it didn't cover the band I really wanted in one
> > tuning range  ( 136 -500KHz).
> >
> > The gap at the top is bridged by a plastic pipe coupler. There is a
> > metal box at the bottom for the tuning capacitor. I'm currently running
> > it on WSPR on 472KHz,
> >
> > You could use plastic pipe if you're not bothered about screening
> >
> > I've used a hula hoop and  in the past  and it  was a bit flimsy.
> >
> > Brian
> 
> 
> 5ft of copper loop in the air sounds heavy but the concept isn't bad, 
> may be on a smaller scale.
> 
> The hula hoop idea I've seen was being used well below (LF of) 472kHz, 
> I'm looking at sub 50kHz- may be with 60kHz just to be sure it works ;-)
> 
> 
> 
> 
> 
> 
> -- 
> 
> Suspect someone is claiming a benefit under false pretences? Incapacity
> Benefit or Personal Independence Payment when they don't need it? They 
> are depriving those in real need!
> 
> https://www.gov.uk/report-benefit-fraud
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBAgAGBQJYtKbiAAoJEJ0q8Kb5p+MeY/MH+wYFAMt4nI7Oj2MU5nukFVct
77HzTmcsvn4ILwylEfBnFXC2KfQymIbKlNcel8OTR4hqf85vsitmpghBBHSzRqMX
SAqKbvnaRJLxQsUYPGIye0MD8vJN50R0i17Qi3WX968HU9LcpRPhoC/Pw9QfW82N
pqVSiilxcFlj1bBzZ3SbFZlX4tccb7+PFYIOuDSVseJbz4GpkKjZCqoEXjUgtTj0
vu/+j93W6ENJ02ZkVY0G2763Osmmrh0sqDWk/laxmyJbDeQ6SeVw66znbAqVcfwL
CGFVLK6Pjvtc172RgBCXBiXPfI2Rn9R8DsuhjZ3UMqGSESuNPLeNjBwRuFEtOl8=
=J6CX
-----END PGP SIGNATURE-----