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Date: Mon, 24 Apr 2017 15:09:20 +0200
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: Fw: Aw: Re: LF: A transductor for power regulation?
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Hello Hans,

Thank you for the photos. A linear variable inductor or a linear 
variable transformer?. Did you use it for fine tuning the resonance of 
your LF antenna? I can imagine this works in a small frequency range.
But if you use it for power regulation, then the load presented to the 
PA can have a big inductive component. Does this work well at 1 kW? For 
a class-E it won't. But also for other switch mode and even linear mode 
PAs i would assume high losses.
The DC winding is in the centre leg, ok. Makes sense. So the output 
winding is also on the centre leg.

73, Stefan

Am 22.04.2017 16:27, schrieb Hans-Albrecht Haffa:
> *Gesendet:* Samstag, 22. April 2017 um 16:21 Uhr
> *Von:* "Hans-Albrecht Haffa" <dk8nd@web.de>
> *An:* Langwellen-Reflektor <rsgb_lf_group@blacksheep.org>
> *Betreff:* Fw: Aw: Re: LF: A transductor for power regulation?
> *Gesendet:* Freitag, 21. April 2017 um 22:33 Uhr
> *Von:* "Hans-Albrecht Haffa" <dk8nd@web.de>
> *An:* rsgb_lf_group@blacksheep.org
> *Betreff:* Aw: Re: LF: A transductor for power regulation?
> Dear Lowfers,
> years ago I have constructed a power reg. with a linear variable 
> inductor. It was possible to regulate power from 1 kW down to 10 W / 
> 60 Ohm at 136 kHz. The temp. coefficient of the inductor is that of 
> the material N27, power dissipation is mainly due to dc losses in the 
> dc-Winding in the centre leg. Clampes for the core halves I cold not 
> use, as stray field in the saturated yokes caused edding currents in 
> the clampes. So the core halves had been fixed with bath-room silicon 
> from the diy-store/home store. Core size is ETD59.
> More detrails upon request.
> 55,
> Hans-Albrecht DK 8 ND
> cba, qrz ok
> *Gesendet:* Donnerstag, 20. April 2017 um 21:02 Uhr
> *Von:* "Claudio Pozzi" <smtp01@email.it>
> *An:* rsgb_lf_group@blacksheep.org
> *Betreff:* Re: LF: A transductor for power regulation?
>
> On Thursday 20 April 2017 11:14:22 you wrote:
>
> > Thanks for all the interesting contributions. The old book is a very
>
> > nice one :-)
>
> >
>
> > I expect using saturated coils rather than a saturated transformer can
>
> > give better results when it is used for keying a carrier (CW, DFCW,
>
> > QRSS, OPERA...). But that will be rather a narrow band solution. The
>
> > transformer has its advantages too. I will continue to improve the ratio
>
> > between keyed and unkeyed power later...
>
> >
>
> > 73, Stefan
>
> >
>
> Some idea for the transformer...
>
> May be that a small toroidal transformer core for mainline power 
> supply can be useful for 2 and 6 kHz bands. But toroid are without 
> transformer air gap.
>
> A core from an old output transformer vacuum tube amplifier can surely 
> be used from few hundreds Hz to 10 kHz, may be up to 20 kHz if 
> salvaged from an Hi-Fi push-pull amplifier. Audio transformer are with 
> air gap.
>
> 73 de Claudio ik2pii
>
>
>
> ----
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Hello Hans,<br>
<br>
Thank you for the photos. A linear variable inductor or a linear
variable transformer?. Did you use it for fine tuning the resonance of
your LF antenna? I can imagine this works in a small frequency range. <br>
But if you use it for power regulation, then the load presented to the
PA can have a big inductive component. Does this work well at 1 kW? For
a class-E it won't. But also for other switch mode and even linear mode
PAs i would assume high losses.<br>
The DC winding is in the centre leg, ok. Makes sense. So the output
winding is also on the centre leg.<br>
<br>
73, Stefan<br>
<br>
Am 22.04.2017 16:27, schrieb Hans-Albrecht Haffa:
<blockquote
 cite="mid:trinity-740dfde3-6249-4fa9-8044-9baf20bd66e0-1492871275675@3capp-webde-bap31"
 type="cite">
  <div style="font-family: Verdana; font-size: 12px;">
  <div> 
  <div> 
  <div name="quote"
 style="border-left: 2px solid rgb(195, 217, 229); margin: 10px 5px 5px 10px; padding: 10px 0pt 10px 10px; word-wrap: break-word;">
  <div style="margin: 0pt 0pt 10px;"><b>Gesendet:</b> Samstag, 22.
April 2017 um 16:21 Uhr<br>
  <b>Von:</b> "Hans-Albrecht Haffa" <a class="moz-txt-link-rfc2396E" href="mailto:dk8nd@web.de">&lt;dk8nd@web.de&gt;</a><br>
  <b>An:</b> Langwellen-Reflektor <a class="moz-txt-link-rfc2396E" href="mailto:rsgb_lf_group@blacksheep.org">&lt;rsgb_lf_group@blacksheep.org&gt;</a><br>
  <b>Betreff:</b> Fw: Aw: Re: LF: A transductor for power regulation?</div>
  <div name="quoted-content">
  <div style="font-family: Verdana; font-size: 12px;">
  <div> 
  <div> 
  <div
 style="border-left: 2px solid rgb(195, 217, 229); margin: 10px 5px 5px 10px; padding: 10px 0pt 10px 10px;">
  <div style="margin: 0pt 0pt 10px;"><b>Gesendet:</b> Freitag, 21.
April 2017 um 22:33 Uhr<br>
  <b>Von:</b> "Hans-Albrecht Haffa" <a class="moz-txt-link-rfc2396E" href="mailto:dk8nd@web.de">&lt;dk8nd@web.de&gt;</a><br>
  <b>An:</b> <a class="moz-txt-link-abbreviated" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
  <b>Betreff:</b> Aw: Re: LF: A transductor for power regulation?</div>
  <div>
  <div style="font-family: Verdana; font-size: 12px;">
  <div>
  <div>Dear Lowfers,</div>
  <div>years ago I have constructed a power reg. with a linear variable
inductor. It was possible to regulate power from 1 kW down to 10 W / 60
Ohm at 136 kHz. The temp. coefficient of the inductor is that of the
material N27, power dissipation is mainly due to dc losses in the
dc-Winding in the centre leg. Clampes for the core halves I cold not
use, as stray field in the saturated yokes caused edding currents in
the clampes. So the core halves had been fixed with bath-room silicon
from the diy-store/home store. Core size is ETD59.</div>
  <div>More detrails upon request.</div>
  <div>55,</div>
  <div>Hans-Albrecht DK 8 ND</div>
  <div>cba, qrz ok</div>
  <div> </div>
  <div> </div>
  <div> 
  <div
 style="border-left: 2px solid rgb(195, 217, 229); margin: 10px 5px 5px 10px; padding: 10px 0pt 10px 10px;">
  <div style="margin: 0pt 0pt 10px;"><b>Gesendet:</b> Donnerstag, 20.
April 2017 um 21:02 Uhr<br>
  <b>Von:</b> "Claudio Pozzi" <a class="moz-txt-link-rfc2396E" href="mailto:smtp01@email.it">&lt;smtp01@email.it&gt;</a><br>
  <b>An:</b> <a class="moz-txt-link-abbreviated" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
  <b>Betreff:</b> Re: LF: A transductor for power regulation?</div>
  <div>
  <div
 style="font-family: &quot;DejaVu Serif&quot;; font-size: 10pt; font-weight: 400; font-style: normal;">
  <p style="margin: 0px; text-indent: 0px;">On Thursday 20 April 2017
11:14:22 you wrote:</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; Thanks for all the
interesting contributions. The old book is a very</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; nice one :-)</p>
  <p style="margin: 0px; text-indent: 0px;">&gt;</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; I expect using
saturated coils rather than a saturated transformer can</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; give better results
when it is used for keying a carrier (CW, DFCW,</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; QRSS, OPERA...). But
that will be rather a narrow band solution. The</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; transformer has its
advantages too. I will continue to improve the ratio</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; between keyed and
unkeyed power later...</p>
  <p style="margin: 0px; text-indent: 0px;">&gt;</p>
  <p style="margin: 0px; text-indent: 0px;">&gt; 73, Stefan</p>
  <p style="margin: 0px; text-indent: 0px;">&gt;</p>
  <p style="margin: 0px; text-indent: 0px;"> </p>
  <p style="margin: 0px; text-indent: 0px;">Some idea for the
transformer...</p>
  <p style="margin: 0px; text-indent: 0px;"> </p>
  <p style="margin: 0px; text-indent: 0px;">May be that a small
toroidal transformer core for mainline power supply can be useful for 2
and 6 kHz bands. But toroid are without transformer air gap.</p>
  <p style="margin: 0px; text-indent: 0px;"> </p>
  <p style="margin: 0px; text-indent: 0px;">A core from an old output
transformer vacuum tube amplifier can surely be used from few hundreds
Hz to 10 kHz, may be up to 20 kHz if salvaged from an Hi-Fi push-pull
amplifier. Audio transformer are with air gap.</p>
  <p style="margin: 0px; text-indent: 0px;"> </p>
  <p style="margin: 0px; text-indent: 0px;">73 de Claudio ik2pii</p>
  <br>
  <br>
 
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ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per
tutti i dettagli <a moz-do-not-send="true"
 href="http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer"
 target="_blank">clicca qui</a><br>
  <br>
Sponsor:<br>
Registra i domini che desideri ed inizia a creare il tuo sito web<br>
  <a moz-do-not-send="true"
 href="http://adv.email.it/cgi-bin/foclick.cgi?mid=13323&amp;d=20-4"
 target="_blank">Clicca qui</a></font><br>
 </p>
  </div>
  </div>
  </div>
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  </div>
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