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Date: Wed, 14 Nov 2018 12:57:25 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
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In-Reply-To: <1UQdpTU9hW.FDxNV5fi6CO@optiplex980-pc>
Subject: Re: LF: Re: LF EbNaut tonite
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Am 14.11.2018 12:12, schrieb jrusgrove@comcast.net:
> Are you still running that amazing glass tube / litz loading coil?
No, sadly it became damaged due to surface arcing that lead to a broken 
glass body. There was a partial discharge guard ring on the top of the 
coil, which lost its contact to the upper turn of the coil. I still have 
the litz laying arround here but i would need to organise a new tube for 
winding. The litz seemed to perform a bit worse in the end. But with a 
larger coil diameter, the Q could be rised and also the L. Then, i could 
cut the first and last 2 meters of the wire to reach the same L again, 
then with even lower losses. But power dissipation is another factor 
that must be considered. You know i'm not the one who avoids effort, so 
you see it is all a question of priorities. In the end of 2013 there was 
not so much interest in LF and so i tended to focus on MF and then VLF...
Let's see what happens in the next time. I'm still a bit unconvinced (by 
myselfe) to put much effort into LF.  Thus i'm running that small lossy 
coil now, out of simple 0.75mm^2 loudspeaker cable onto a 20 cm diameter 
PVC tube... But it seems to be fine for some testing :-)

73, Stefan

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Am 14.11.2018 12:12, schrieb <a class="moz-txt-link-abbreviated" href="mailto:jrusgrove@comcast.net:">jrusgrove@comcast.net:</a>
<blockquote cite="mid:1UQdpTU9hW.FDxNV5fi6CO@optiplex980-pc" type="cite">
  <style type="text/css"> body { margin:0.7em; } body.OECFntDef, body.OECFntDef div { font-family:Arial,"Segoe UI",Tahoma,Verdana,Helvetica,sans-serif;font-size:10pt; }</style>
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  <div>Are you still running that amazing glass tube / litz loading
coil?</div>
</blockquote>
No, sadly it became damaged due to surface arcing that lead to a broken
glass body. There was a partial discharge guard ring on the top of the
coil, which lost its contact to the upper turn of the coil. I still
have the litz laying arround here but i would need to organise a new
tube for winding. The litz seemed to perform a bit worse in the end.
But with a larger coil diameter, the Q could be rised and also the L.
Then, i could cut the first and last 2 meters of the wire to reach the
same L again, then with even lower losses. But power dissipation is
another factor that must be considered. You know i'm not the one who
avoids effort, so you see it is all a question of priorities. In the
end of 2013 there was not so much interest in LF and so i tended to
focus on MF and then VLF...<br>
Let's see what happens in the next time. I'm still a bit unconvinced
(by myselfe) to put much effort into LF.  Thus i'm running that small
lossy coil now, out of simple 0.75mm^2 loudspeaker cable onto a 20 cm
diameter PVC tube... But it seems to be fine for some testing :-)<br>
<br>
73, Stefan<br>
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