LF: Re: R7NT WSPR15

["Gary - G4WGT" <g4wgt@tiscali.co.uk>]

Hi Stefan,

Try pyramid winding, I am using this on my 136 kHz coil, saves space.
A bit tricky to do though :-

http://www.oz8nj.dk/spoler.htm

And my coil :-
http://myweb.tiscali.co.uk/wgtaylor/LF%20&%20MF%20Experiments%2010.html

73, Gary - G4WGT.


-----Original Message----- 
From: DK7FC 
Sent: Sunday, September 13, 2015 5:04 PM 
To: rsgb_lf_group@blacksheep.org 
Subject: Re: LF: R7NT WSPR15 

Hi Jay,

I think the guard ring above the upper winding of the coil lost its 
contact to this winding. So it was floating. Or, the contact was loose 
so there was a small arc that started to burn that ring down so the 
structure became more and more inhomogenious, from a E-field view. Well, 
at least it worked very well since 2011!
I want to get even better results after the maintenance. There is some 
room for improvements: The diameter / length ratio has never been 
optimal on that coil. I want to check if it's possible to build a double 
layer coil, at least a few of the upper windings... Effort but 
interesting :-)
73, Stefan

Am 13.09.2015 15:35, schrieb jrusgrove@comcast.net:
> Stefan
>
> Any idea what started the meltdown?
>
> Heard someone say once: There are two types of LF ops ... those that 
> have experienced fires ... and those that will ;~) .
> Jay W1VD  WD2XNS  WE2XGR/2
>
>
> ----- Original Message ----- From: "DK7FC" <selberdenken@posteo.de>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Sunday, September 13, 2015 9:16 AM
> Subject: Re: LF: R7NT WSPR15
>
>
> > Hi LF,
> >
> > Unfortunately my LF coil got damaged during transmitting a few weeks 
> > ago. I'm soon repairing the coil and hope to join the 2200m band then 
> > again.
> > https://dl.dropboxusercontent.com/u/19882028/LF/20150910_193005.jpg
> > https://dl.dropboxusercontent.com/u/19882028/LF/20150910_192916.jpg
> > https://dl.dropboxusercontent.com/u/19882028/LF/20150902_182551.jpg
> >
> > 73, Stefan
> >
> > Am 13.09.2015 15:02, schrieb Mike Dennison:
> > > Alex was also a good signal with me when he sent Opera 32 last night.
> > >
> > > Mike, G3XDV
> > > ==========
> > >
> > >
> > > > Hi Alex,
> > > >
> > > >
> > > >
> > > > sorry my WSPR is on strike, no uploads.
> > > >
> > > > Made it now manually.
> > > >
> > > >
> > > >
> > > > 1745 -35 1.1 0.137603 0 R7NT KN97 53
> > > >
> > > > 1800 -32 1.1 0.137603 0 R7NT KN97 53
> > > >
> > > > 1815 -35 -0.2 0.137604 0 UT7GH KN66 20
> > > >
> > > > 1845 -36 1.5 0.137603 0 R7NT KN97 53
> > > >
> > > > 1900 -34 1.5 0.137603 0 R7NT KN97 53
> > > >
> > > >
> > > >
> > > > 73 Joe
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > -----
> > > > No virus found in this message.
> > > > Checked by AVG - www.avg.com
> > > > Version: 2015.0.6125 / Virus Database: 4419/10626 - Release Date:
> > > > 09/12/15