Return-Path: X-Spam-DCC: paranoid 1356; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t9VIYahO012328 for ; Sat, 31 Oct 2015 19:34:36 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZsawI-0005oj-TV for rs_out_1@blacksheep.org; Sat, 31 Oct 2015 18:31:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZsawI-0005oa-Ko for rsgb_lf_group@blacksheep.org; Sat, 31 Oct 2015 18:31:42 +0000 Received: from mout.gmx.net ([212.227.17.22]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1ZsavE-00033G-Ev for rsgb_lf_group@blacksheep.org; Sat, 31 Oct 2015 18:31:41 +0000 Received: from Clemens0811 ([79.237.142.207]) by mail.gmx.com (mrgmx103) with ESMTPSA (Nemesis) id 0MfmZs-1a4mfw0Co8-00N7TK for ; Sat, 31 Oct 2015 19:30:20 +0100 From: "Clemens Paul" To: References: <1887849276.20151030143118@chriswilson.tv>, <5633B50A.5030903@posteo.de> <5633D56C.20659.23BE4D8@mike.dennison.ntlworld.com> <316685691.20151031121552@chriswilson.tv> In-Reply-To: <316685691.20151031121552@chriswilson.tv> Date: Sat, 31 Oct 2015 19:30:18 +0100 Message-ID: MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 Thread-Index: AdET1ktvoMMXpKwzQ6aCQwLmmm1qqQAMt9sw X-Provags-ID: V03:K0:J8//BRWjaf7pHLGC9PnR1iRHmS1eAehfwXQG12pdIQmQNuXkMIx oE4HeYzsW2t6eIDRbunyVq6ZK9YuMBNXt6+MQE9fYypKO5StNKI/R/dj8TtnbuK1ws+8AGo xdHYjUU173NCirytnEPWqsoYcHMkwDuXyequlROzK13SkUEI7dtZPmVBlf58Cu6xTlzocU8 Yo8AHv9lCUVEJbnz5lsww== X-UI-Out-Filterresults: notjunk:1;V01:K0:H8n0+xGJxeM=:4lSJdi9+jdphB9KXd/UWDZ py8ek+VGl8inBO72CBTRqYyGzl3cf4KddgA0DbasjSdFaOZTj1T3QgNVNg1MCMmbaihKEj5Rg wUMbPgSj6EmSSA/k5qkFe2YP7NGnv5DyuQc3zzZgzAXLzL777QMv422vKRB8lu2jBSkO73mjM cMAw2KYeOh9dJEz2rA6WIh+QHb2UqTYg/lNqMi7Ic7Z7y3TYBLrkFt57k0yxQgjfhld9cKJw8 NxEh0eezG28LHwLpaHu6QmEgI/rOtSBtAH4492oajYlvU4q+e2YcJgLtstiVknxve67++5EJy Ur2GoKJVDSRw0XoMEEKzvu1WlVc6DXeNmOfxLd4wbrju2Jch0RSoRXFMMcUNGBlSsV8jTA3Y9 hfIKp+3ErhWTGYhHkJ4i0kPI6fHoBgU3+z/IlHAuERUGIOHkM+5yrO4ALVx5k0plsJPkN31ry jS/8DwRQUSNCc4GvfmQ6gpbRpsNiALuAQnTx6uPFDcbDt7ZT6RpId/0NsXELKq8ucRtmi4sHT XstMZRenJoAEF+J0eIyo6ii6WWGZ7RAe9RZ0o5Mb2wYMzIn+gxVB77sz+hffhO9Kk5TGq42CI Na2wNaNkV/oI8Css+vhJznaMXegeT9qsz06XxcpGuHYRz32Oq8SQER2v2deWSM9Ez7fM0gNWS uqW/dPWRkGT1fqXgNESSpBYPGKtCbnjfo9/BoiFyg5a9SAxPzjm1Z2fVMuWIEjiJsaUvO5lT4 BfXCKP6YkcWv+Dh3SFDTAHK+WuIZ+fXEKSfwD+m2CfOcoyD0wGocJ8a3p0iiTM/N8Ji6kbBf0 KmcA+IL X-Scan-Signature: bb61bee384896e075004ae5ec954ddd2 Subject: RE: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better? Content-Type: text/plain; charset="us-ascii" 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4735 Hi Chris, >I have a 3C90 core spare and will wind a 1 : >1 transformer for now, just for isolation. How many turns should I use >for best efficiency? It's primarily not a matter of efficieny but of flux density in the core (->heating ,saturation) What is the size of the core and your power level? Generally I would wind as much turns as feasible on the core to keep flux as low as possible. For best efficiency and low stray inductance tight coupling of the primary and secondary winding is essential. 73 Clemens DL4RAJ >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Chris Wilson >Sent: Saturday, October 31, 2015 1:16 PM >To: Mike Dennison >Subject: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better? >