Message-ID: <5A0DC9D1.1050706@posteo.de>
Date: Thu, 16 Nov 2017 18:24:33 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <15f68ccfd03-c09-1dcf0@webjas-vaa134.srv.aolmail.net> <Pine.LNX.4.64.1710291833570.23786@plato.ucs.mun.ca> <40168a26-8991-6998-e541-585a8575ad32@abelian.org> <59FCF49B.9050703@posteo.de> <5A06DAE4.9030301@posteo.de> <5A072F91.1050406@posteo.de> <5A083D50.2080105@posteo.de> <34e5e647-caf1-6184-9ab5-9d293486994f@abelian.org> <5A085F65.3060409@posteo.de> <b81c78a3-c6fa-b07c-b14b-ca0a983bcd68@abelian.org> <5A0889B1.3020701@posteo.de> <5A09B458.1040700@posteo.de>
In-Reply-To: <5A09B458.1040700@posteo.de>
Subject: Re: ULF: A next step for 970 Hz
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...today i drove to the company and got that high permeablic strip. 
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/Powercore_H075-18_20mm_Thyssen.jpg
Quite a large amount!
To be continued...

73, Stefan

Am 13.11.2017 16:03, schrieb DK7FC:
> Today i searched for suitable materials to build a iron band rod for a 
> coil for 970 Hz.
> I learned about kornorientiertes Elektroblech, 
> https://de.wikipedia.org/wiki/Elektroblech or 
> https://en.wikipedia.org/wiki/Electrical_steel
> A normal 50 Hz transformer is using 0.5 mm plates. For higher 
> frequencies there are thinner plates available.
> I searched for a local company and quickly found this product catalogue:
> http://www.lohse-ringbandkerne.de/uploads/downloads/Lohse%20Prospekt%20D_web_2017.pdf
>
> Excellent! They offer 0.23 mm think plates.
> Then i sent them an email request and later i had a telephone talk 
> with the chief of the company. I asked if they have maybe even better 
> materials and he said yes, they have a band of the type H075/18/20. 
> This is a band which has a thickness of just *0.18 mm* and it is 20 mm 
> width. Since it is grain-oriented it matters how the B field passes 
> through it.
> He said that this special band is worse at 50 Hz but can be used to up 
> to 4 kHz!!!!!!!!!!!!!!!!!!!!!!!!!!! So maybe this opens the frequency 
> range from 4 kHz down to the lower ULF!!!! :-)
>
> I got a good price, just 4 EUR for 1 kg but i have to order at least 
> for 100 EUR so i will order 25 kg of that stuff! Already done!
>
> My idea is to build a 0.5 m long rod. One piece of the band will then 
> have a cross section area of  3.6 mm^2. I will need about 1000 to 1500 
> of these bands in parallel. This should fit into a PVC tube with an 
> outher diameter of 80 mm. Very handy!
>
> I'll keep you informed ;-)
>
> 73, Stefan

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...today i drove to the company and got that high permeablic strip.
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/Powercore_H075-18_20mm_Thyssen.jpg">http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/Powercore_H075-18_20mm_Thyssen.jpg</a><br>
Quite a large amount!<br>
To be continued...<br>
<br>
73, Stefan<br>
<br>
Am 13.11.2017 16:03, schrieb DK7FC:
<blockquote cite="mid:5A09B458.1040700@posteo.de" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
Today i searched for suitable materials to build a iron band rod for a
coil for 970 Hz. <br>
I learned about kornorientiertes Elektroblech,
  <a moz-do-not-send="true" class="moz-txt-link-freetext"
 href="https://de.wikipedia.org/wiki/Elektroblech">https://de.wikipedia.org/wiki/Elektroblech</a>
or
  <a moz-do-not-send="true" class="moz-txt-link-freetext"
 href="https://en.wikipedia.org/wiki/Electrical_steel">https://en.wikipedia.org/wiki/Electrical_steel</a><br>
A normal 50 Hz transformer is using 0.5 mm plates. For higher
frequencies there are thinner plates available.<br>
I searched for a local company and quickly found this product catalogue:<br>
  <a moz-do-not-send="true" class="moz-txt-link-freetext"
 href="http://www.lohse-ringbandkerne.de/uploads/downloads/Lohse%20Prospekt%20D_web_2017.pdf">http://www.lohse-ringbandkerne.de/uploads/downloads/Lohse%20Prospekt%20D_web_2017.pdf</a><br>
  <br>
Excellent! They offer 0.23 mm think plates. <br>
Then i sent them an email request and later i had a telephone talk with
the chief of the company. I asked if they have maybe even better
materials and he said yes, they have a band of the type H075/18/20.
This is a band which has a thickness of just <b>0.18 mm</b> and it is
20 mm width. Since it is grain-oriented it matters how the B field
passes through it. <br>
He said that this special band is worse at 50 Hz but can be used to up
to 4 kHz!!!!!!!!!!!!!!!!!!!!!!!!!!! So maybe this opens the frequency
range from 4 kHz down to the lower ULF!!!! :-)<br>
  <br>
I got a good price, just 4 EUR for 1 kg but i have to order at least
for 100 EUR so i will order 25 kg of that stuff! Already done!<br>
  <br>
My idea is to build a 0.5 m long rod. One piece of the band will then
have a cross section area of  3.6 mm^2. I will need about 1000 to 1500
of these bands in parallel. This should fit into a PVC tube with an
outher diameter of 80 mm. Very handy!<br>
  <br>
I'll keep you informed ;-)<br>
  <br>
73, Stefan<br>
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