Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,RCVD_IN_DNSWL_MED,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v3K9Hg8l022472 for ; Thu, 20 Apr 2017 11:17:44 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d18AV-0005dh-RL for rs_out_1@blacksheep.org; Thu, 20 Apr 2017 10:14:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d18AV-0005dY-F7 for rsgb_lf_group@blacksheep.org; Thu, 20 Apr 2017 10:14:27 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1d18AS-0005ih-Aa for rsgb_lf_group@blacksheep.org; Thu, 20 Apr 2017 10:14:26 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 823BB20C82 for ; Thu, 20 Apr 2017 11:14:23 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3w7tV63tcLz109L for ; Thu, 20 Apr 2017 11:14:22 +0200 (CEST) Message-ID: <58F87BEE.9060507@posteo.de> Date: Thu, 20 Apr 2017 11:14:22 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <15b8a4894c4-4fd4-2ae72@webprd-m10.mail.aol.com> In-Reply-To: <15b8a4894c4-4fd4-2ae72@webprd-m10.mail.aol.com> X-Scan-Signature: e6360f34ef88d0e1db765f70efb2bfe9 Subject: Re: LF: A transductor for power regulation? Content-Type: multipart/alternative; boundary="------------080701060408060605000806" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11406 This is a multi-part message in MIME format. --------------080701060408060605000806 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 Am 20.04.2017 09:34, schrieb gw8glo@aol.co.uk: > I used a much smaller circuit but identical as an input attenuator for > an experimental vlf transceiver and it worked very well. The control > was obtained from the agc line. Definitely worth pursuing!1 > 73 Dave > > > > -----Original Message----- > From: Claudio Pozzi > To: rsgb_lf_group > Sent: Wed, 19 Apr 2017 18:46 > Subject: Re: LF: A transductor for power regulation? > > On Wednesday 19 April 2017 14:41:35 you wrote: > SNIP > > > > What about the circuit from my attachment? The windings labeled with DC > > and switched anti-series, so that the AC voltage componsates. The AC > > output winding is switched in series, so that the voltage doubles. When > > the two other legs are saturated there is still a magnetic conductive > > leg in the center, like a rod. This could still provide enough L for the > > primary coil. The DC H fields compensate in the center leg. Could work, > > right? > Your circuit is a magnetic amplifier. > This book is useful. > https://archive.org/details/MagneticAmplifiers > > 73 > Claudio ik2pii --------------080701060408060605000806 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit 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


Am 20.04.2017 09:34, schrieb gw8glo@aol.co.uk:
I used a much smaller circuit but identical as an input attenuator for an experimental vlf transceiver and it worked very well. The control was obtained from the agc line. Definitely worth pursuing!1
73 Dave



-----Original Message-----
From: Claudio Pozzi <smtp01@email.it>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Sent: Wed, 19 Apr 2017 18:46
Subject: Re: LF: A transductor for power regulation?

On Wednesday 19 April 2017 14:41:35 you wrote:
 
SNIP
 
>
> What about the circuit from my attachment? The windings labeled with DC
> and switched anti-series, so that the AC voltage componsates. The AC
> output winding is switched in series, so that the voltage doubles. When
> the two other legs are saturated there is still a magnetic conductive
> leg in the center, like a rod. This could still provide enough L for the
> primary coil. The DC H fields compensate in the center leg. Could work,
> right?
 
Your circuit is a magnetic amplifier.
 
This book is useful.
 
 
73
 
Claudio ik2pii
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