Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1DE1B38000086; Sun, 16 Dec 2012 03:35:06 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Tk9fl-0007UN-5D for rs_out_1@blacksheep.org; Sun, 16 Dec 2012 08:34:09 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Tk9fk-0007UE-GR for rsgb_lf_group@blacksheep.org; Sun, 16 Dec 2012 08:34:08 +0000 Received: from mout.gmx.net ([212.227.15.19]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1Tk9fg-0008EV-Qk for rsgb_lf_group@blacksheep.org; Sun, 16 Dec 2012 08:34:06 +0000 Received: from mailout-de.gmx.net ([10.1.76.2]) by mrigmx.server.lan (mrigmx002) with ESMTP (Nemesis) id 0MMZH6-1TlpA92Qus-008FWR for =?utf-8?q?;?= Sun, 16 Dec 2012 09:33:43 +0100 Received: (qmail invoked by alias); 16 Dec 2012 08:33:42 -0000 Received: from p4FDD6917.dip.t-dialin.net (EHLO Clemens0811) [79.221.105.23] by mail.gmx.net (mp002) with SMTP; 16 Dec 2012 09:33:42 +0100 X-Authenticated: #17214767 X-Provags-ID: V01U2FsdGVkX1+RnHha/cqR1H+Tr6UaclXJkBuPPEJyinKDjmP20v puwGx2+afcmzTR From: "Clemens Paul" To: References: <001f01cddb10$64a50b30$0501a8c0@xphd97xgq27nyf> <50CD1F7A.3040304@iup.uni-heidelberg.de> In-Reply-To: <50CD1F7A.3040304@iup.uni-heidelberg.de> Date: Sun, 16 Dec 2012 09:33:41 +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: Ac3bKloU+vX+d6XYTFCxnWbfH1X6fwAO6lDg X-Y-GMX-Trusted: 0 X-Spam-Score: -0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Stefan, Yes, using the whole circumference is better Agreed... [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.227.15.19 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (cpaul[at]gmx.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: c1dcf088149efa0360827745859da381 Subject: RE: LF: Re: Re: M0BMU mods to the G0MRF PA Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01CDDB70.708FE130" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE autolearn=no version=2.63 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-aol-global-disposition: G x-aol-sid: 3039ac1d408d50cd87ba0e0f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0036_01CDDB70.708FE130 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stefan, =20 Yes, using the whole circumference is better =20 Agreed... =20 , especially when the core is driven close to saturation =20 ...but with a partial winding I would expect *less* danger for the core = to saturate (given the same current). If you wind only a part of the core more of the magnetic field can = escape und you get less flux inside the core but more leakage inductance.. =20 73 Clemens DL4RAJ=20 =20 _____ =20 From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan = Sch=E4fer Sent: Sunday, December 16, 2012 2:10 AM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Re: Re: M0BMU mods to the G0MRF PA Mal,=20 Am 15.12.2012 23:06, schrieb mal hamilton:=20 Gary I see you only wind on half the ferrite core whereas I spread the turns symetrically around the whole circumference. In my case I need 8 turns on Prim es 24 on Sec.=20 I first wind the 24 turns around the circumference evenly then the 8 = tunrns on top also evenly. This works for me. I wonder if there is any real difference in efficiency Yes, using the whole circumference is better, especially when the core = is driven close to saturation. Also the AL value from the datasheet for a certain core assumes a homogen spread of the turns. Warren,=20 Yes, of course you can make taps on the secondary side. I'm doing this = in my MF matchbox, using a 6 pole switch. This allows to rise the power in 3 = dB steps... 73, Stefan/DK7FC E-Mail ist virenfrei. Von AVG =FCberpr=FCft - www.avg.de Version: 2013.0.2805 / Virendatenbank: 2637/5961 - Ausgabedatum: = 15.12.2012=20 ------=_NextPart_000_0036_01CDDB70.708FE130 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Stefan,
 
Yes, using = the whole=20 circumference is better
 
Agreed...
 
, = especially when the=20 core is driven close to saturation
 
...but=20 with a partial winding I would expect *less* danger for the core to = saturate=20 (given the same current).
If you=20 wind only a part of the core more of the magnetic field can escape und = you get=20 less flux
inside=20 the core but more leakage inductance..
 

73
Clemens
DL4RAJ

 

From: = owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan = Sch=E4fer
Sent: Sunday, December 16, 2012 2:10 = AM
To:=20 rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: Re: M0BMU = mods to=20 the G0MRF PA

Mal,

Am 15.12.2012 23:06, schrieb mal hamilton:=20
Gary
I see you only wind on half the ferrite core = whereas I=20 spread the turns symetrically around the whole = circumference.
In my case I need 8 turns on Prim es 24 on = Sec.=20
I first wind the 24 turns around the=20 circumference evenly then the 8 tunrns on top also evenly. This = works=20 for me.
I wonder if there is any real difference in=20 efficiency

Yes, using the whole = circumference is=20 better, especially when the core is driven close to saturation. Also = the AL=20 value from the datasheet for a certain core assumes a homogen spread = of the=20 turns.


Warren,

Yes, of course you can make taps on = the=20 secondary side. I'm doing this in my MF matchbox, using a 6 pole = switch. This=20 allows to rise the power in 3 dB steps...

73,=20 Stefan/DK7FC


E-Mail ist = virenfrei.
Von AVG=20 =FCberpr=FCft - www.avg.de
Version: 2013.0.2805=20 / Virendatenbank: 2637/5961 - Ausgabedatum: 15.12.2012=20

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