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=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; 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 v3KJ6ABs025601 for ; Thu, 20 Apr 2017 21:06:11 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1d1HLI-0002cg-MZ for rs_out_1@blacksheep.org; Thu, 20 Apr 2017 20:02:12 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1d1HLI-0002cX-5K for rsgb_lf_group@blacksheep.org; Thu, 20 Apr 2017 20:02:12 +0100 Received: from emout03.email.it ([212.97.34.22]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1d1HLE-00082F-4e for rsgb_lf_group@blacksheep.org; Thu, 20 Apr 2017 20:02:10 +0100 Received: from emout03.email.it (localhost [127.0.0.1]) by emout03.email.it (Postfix) with ESMTP id 0A00096206 for ; Thu, 20 Apr 2017 21:02:00 +0200 (CEST) Received: from x220.localnet (94-36-127-52.adsl-ull.clienti.tiscali.it [94.36.127.52]) by emout03.email.it (Postfix) with ESMTPA id D3A4896202 for ; Thu, 20 Apr 2017 21:01:59 +0200 (CEST) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Date: Thu, 20 Apr 2017 21:02:24 +0200 Message-ID: <3041696.sfmSKjYOYX@x220> User-Agent: KMail/4.14.1 (Linux/3.16.0-4-amd64; KDE/4.14.2; x86_64; ; ) In-Reply-To: <58F87BEE.9060507@posteo.de> References: <15b8a4894c4-4fd4-2ae72@webprd-m10.mail.aol.com> <58F87BEE.9060507@posteo.de> MIME-Version: 1.0 X-Scan-Signature: 4d97240a623a26620214cd27feaa9f71 Subject: Re: LF: A transductor for power regulation? Content-Type: multipart/alternative; boundary="nextPart6299919.I1Tcqy1Nu8" Content-Transfer-Encoding: 7Bit 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: 11415 This is a multi-part message in MIME format. --nextPart6299919.I1Tcqy1Nu8 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" 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 -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Registra i domini che desideri ed inizia a creare il tuo sito web Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13323&d=20-4 --nextPart6299919.I1Tcqy1Nu8 Content-Transfer-Encoding: 7Bit Content-Type: text/html; charset="us-ascii"

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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