Message-ID: <5BCF3F9F.1080608@posteo.de>
Date: Tue, 23 Oct 2018 17:34:55 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <5BCC66BE.8030109@posteo.de> <5BCDCAD5.707@posteo.de> <5BCF1E75.3060709@posteo.de> <1659090081.20181023143647@gmail.com> <5BCF25E0.5020008@posteo.de> <CAA8k23RQcc+eYkKF3MzBxv8hNyD3DuCzEcgm5UHtBd+XBhtSUQ@mail.gmail.com>
In-Reply-To: <CAA8k23RQcc+eYkKF3MzBxv8hNyD3DuCzEcgm5UHtBd+XBhtSUQ@mail.gmail.com>
Subject: Re: LF: Rogowski-coils for RF measurements
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I think it should be possible to pull the hose onto a broomstick and 
then rotate that by a motor. But it is a better idea to wind it nearly 
in the shape as it will be when measuring (i.e. a circle). The wire is 
hold on the hose by using double sided adhesive tape. Later i'll fix it 
using shrink tube.
The turn diameter is 20 mm. And the circumference is now 0.8m. Quite 
much but it will help to get higher signal levels, i.e. less critical 
for smaller ranges...

73, Stefan

Am 23.10.2018 15:53, schrieb Andy Talbot:
> Winding a flexible form like that, with no possibility of holding it 
> in a drill chuck or similar, must be good for exercising the arm 
> muscles. After winding my original 73kHz loading coil my arm ached for 
> a few days afterwards.
>
> Andy
> www.g4jnt.com <http://www.g4jnt.com>
>
>
>
> On Tue, 23 Oct 2018 at 14:47, DK7FC <selberdenken@posteo.de 
> <mailto:selberdenken@posteo.de>> wrote:
>
>     Hi Chris,
>
>     This wire (exactly this piece of wire) has been used for the first
>     version of the 900m long ground loop antenna some moths ago.
>     Earlier, it
>     was part of my large 6.1 H coil that i used on 2970 Hz in the
>     beginning
>     of 2016 :-)
>     So it is recycling. Mother nature, you know...
>
>     73, Stefan
>
>     Am 23.10.2018 15:36, schrieb Chris Wilson:
>     >
>     > Hello Stefan,
>     >
>     > I  do sometimes wonder how many meters of copper wire you coil
>     up in a
>     > given year, you must be a wire salesman's dream customer :)
>     >
>     > Tuesday, October 23, 2018, 2:13:25 PM, you wrote:
>     >
>     >
>     >> ...now i started to build one, see attachment.
>     >> Not yet sure how it will perform. DON'T bother me with calculations
>     >> telling it won't work! ;-)
>     >>
>     >
>     >> 73, Stefan
>     >>
>     >
>     >
>     >
>     >
>

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I think it should be possible to pull the hose onto a broomstick and
then rotate that by a motor. But it is a better idea to wind it nearly
in the shape as it will be when measuring (i.e. a circle). The wire is
hold on the hose by using double sided adhesive tape. Later i'll fix it
using shrink tube.<br>
The turn diameter is 20 mm. And the circumference is now 0.8m. Quite
much but it will help to get higher signal levels, i.e. less critical
for smaller ranges...<br>
<br>
73, Stefan<br>
<br>
Am 23.10.2018 15:53, schrieb Andy Talbot:
<blockquote
 cite="mid:CAA8k23RQcc+eYkKF3MzBxv8hNyD3DuCzEcgm5UHtBd+XBhtSUQ@mail.gmail.com"
 type="cite">
  <div dir="ltr">
  <div class="gmail_default"
 style="font-family: tahoma,sans-serif; font-size: small;">Winding a
flexible form like that, with no possibility of holding it in a drill
chuck or similar, must be good for exercising the arm muscles. After
winding my original 73kHz loading coil my arm ached for a few days
afterwards.</div>
  <div class="gmail_default"
 style="font-family: tahoma,sans-serif; font-size: small;"><br>
  </div>
  <div>
  <div dir="ltr" class="gmail_signature"
 data-smartmail="gmail_signature">
  <div dir="ltr">
  <div>
  <div dir="ltr">
  <div>
  <div dir="ltr">
  <div>
  <div dir="ltr">
  <div>
  <div dir="ltr">Andy
  <div><span style="font-size: 12.8px;"><a moz-do-not-send="true"
 href="http://www.g4jnt.com" target="_blank">www.g4jnt.com</a></span><br>
  </div>
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  </div>
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  </div>
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  </div>
  </div>
  <br>
  </div>
  <br>
  <div class="gmail_quote">
  <div dir="ltr">On Tue, 23 Oct 2018 at 14:47, DK7FC &lt;<a
 moz-do-not-send="true" href="mailto:selberdenken@posteo.de">selberdenken@posteo.de</a>&gt;
wrote:<br>
  </div>
  <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi
Chris,<br>
    <br>
This wire (exactly this piece of wire) has been used for the first <br>
version of the 900m long ground loop antenna some moths ago. Earlier,
it <br>
was part of my large 6.1 H coil that i used on 2970 Hz in the beginning
    <br>
of 2016 :-)<br>
So it is recycling. Mother nature, you know...<br>
    <br>
73, Stefan<br>
    <br>
Am 23.10.2018 15:36, schrieb Chris Wilson:<br>
&gt;<br>
&gt; Hello Stefan,<br>
&gt;<br>
&gt; I  do sometimes wonder how many meters of copper wire you coil up
in a<br>
&gt; given year, you must be a wire salesman's dream customer :)<br>
&gt;<br>
&gt; Tuesday, October 23, 2018, 2:13:25 PM, you wrote:<br>
&gt;<br>
&gt;    <br>
&gt;&gt; ...now i started to build one, see attachment.<br>
&gt;&gt; Not yet sure how it will perform. DON'T bother me with
calculations<br>
&gt;&gt; telling it won't work! ;-)<br>
&gt;&gt;      <br>
&gt;    <br>
&gt;&gt; 73, Stefan<br>
&gt;&gt;      <br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt;    <br>
    <br>
  </blockquote>
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